{"title":"Allen-Bradley PLC-5 System","description":"\u003cp\u003eThe Allen-Bradley PLC-5 System is a legendary legacy platform that served as the industry standard for decades. Its architecture is based on the 1771- universal I\/O chassis and 1785- processors, supporting large-scale distributed control via Remote I\/O and Data Highway Plus. Technical characteristics include a robust, all-metal hardware design and extensive diagnostic capabilities for high-availability environments. Functionally, PLC-5 manages high-density discrete and complex analog process signals in automotive and steel mills. While users often transition to \u003ca href=\"https:\/\/www.plcprotech.com\/collections\/allen-bradley-controllogix\"\u003eControlLogix\u003c\/a\u003e, maintaining PLC-5 systems requires high-quality 1771 and 1785 spare parts to ensure the longevity of critical legacy control loops.\u003c\/p\u003e","products":[{"product_id":"allen-bradley-1785-bcm-plc-5-backup-communication-module","title":"Allen-Bradley 1785-BCM PLC-5 Backup Communication Module","description":"\u003cp\u003e\u003cspan\u003e\u003cspan class=\"citation-936\"\u003eThe \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"citation-936\"\u003e1785-BCM\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"citation-936\"\u003e functions as a high-reliability hardware hot-backup module within the classic Allen-Bradley PLC-5 system architecture, officially designated as the \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"citation-936\"\u003ePLC-5 Backup Communication Module\u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-936 citation-end-936\"\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e. \u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-935\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003eEngineered to provide high-availability system redundancy, it coordinates the synchronization of a dual-processor environment to prevent costly automation shutdown in continuous operations\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-935 citation-end-935\"\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e. \u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-934\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003eOperating in primary\/secondary pairs across twin local chassis, it tracks system health and handles the immediate, automatic takeover of field communications if a system failure occurs\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-934 citation-end-934\"\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eRedundancy Architecture and Operating Topology\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003e\u003cspan class=\"citation-933\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-933\"\u003eThe 1785-BCM establishes a hardware hot-backup network by cross-linking an active \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"citation-933\"\u003ePrimary System\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"citation-933\"\u003e (which actively controls remote I\/O and process equipment) to a synchronized \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"citation-933\"\u003eSecondary System\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"citation-933\"\u003e (held in a high-readiness standby state)\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-933 citation-end-933\"\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThe system provides complete data alignment and immediate network recovery across three core communication mechanisms:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan\u003e\u003cstrong\u003e\u003cspan class=\"citation-932\"\u003eHigh-Speed Serial Link (HSSL):\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"citation-932\"\u003e A dedicated inter-chassis differential communication pathway connected directly between the primary and secondary 1785-BCM modules\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-932 citation-end-932\"\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e. \u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-931\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003eRunning at a high-speed rate of 1.2 Megabits on Series B hardware (compared to 115 kbaud on legacy Series A units), the HSSL transmits remote input data, internal logic status, and user-defined data tables\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-931 citation-end-931\"\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003e\u003cstrong\u003e\u003cspan class=\"citation-930\"\u003eSmart Switch Remote I\/O Interface:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"citation-930\"\u003e During standard runtime, the secondary processor is physically isolated from the field wiring but continues polling its local 1785-BCM\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-930 citation-end-930\"\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e. \u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-929\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003eThis module's integrated \"Smart Switch\" mimics real field nodes by populating the secondary processor's input image table with real-time data received across the HSSL\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-929 citation-end-929\"\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e. \u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-928\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003eThis architecture keeps the standby processor's logic memory completely identical to the primary unit\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-928 citation-end-928\"\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003e\u003cstrong\u003e\u003cspan class=\"citation-927\"\u003eBumpless Switchover Execution:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"citation-927\"\u003e If the primary system experiences a power failure, a processor fault, a local 1785-BCM hardware error, or an intentional keyswitch mode change (e.g., from RUN to PROGRAM), a switchover is triggered\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-927 citation-end-927\"\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e. \u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-926\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003eHigh-speed internal isolation relays on the primary module snap open, and matching relays on the standby module close\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-926 citation-end-926\"\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e. \u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-925\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-925\"\u003eControl of the Remote I\/O and Data Highway Plus networks transfers to the secondary processor in \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"citation-925\"\u003eless than 50 milliseconds\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"citation-925\"\u003e, keeping field outputs stable in their last state during the brief transition window\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-925 citation-end-925\"\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eParameter Metric\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eFactory Manual Specification Data\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eModel Catalog Number\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003e\u003cspan class=\"citation-924\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e1785-BCM\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-924 citation-end-924\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003e\u003cspan class=\"citation-923\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003eAllen-Bradley \/ Rockwell Automation\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-923 citation-end-923\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eRedundancy System Class\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003e\u003cspan class=\"citation-922\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003ePLC-5 Hot-Backup Core Communication Engine\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-922 citation-end-922\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBackplane Current Consumption\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003e\u003cspan class=\"citation-921\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e1.8 A maximum @ 5V DC\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-921 citation-end-921\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eModule Power Dissipation\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003e\u003cspan class=\"citation-920\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e9.0 Watts maximum\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-920 citation-end-920\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eThermal Load Dissipation\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003e\u003cspan class=\"citation-919\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e30.7 BTU\/hour\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-919 citation-end-919\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eHSSL Transmission Speed\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003e\u003cspan class=\"citation-918\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e1.2 Mbps (Series B) \/ 115 kbaud (Series A)\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-918 citation-end-918\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eIntegrated Communication Ports\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003e\u003cspan class=\"citation-917\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e2 Configurable Channels (Channel 1A \u0026amp; Channel 1B)\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-917 citation-end-917\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eSupported Channel Networks\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003e\u003cspan class=\"citation-916\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003eData Highway Plus (DH+) and Universal Remote I\/O (RIO)\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-916 citation-end-916\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eMaximum Switchover Window\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cspan class=\"math-inline\"\u003e$\\le$\u003c\/span\u003e\u003cspan class=\"citation-915\"\u003e 50 milliseconds maximum\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-915 citation-end-915\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eLocal Data Buffer Capacity\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003e\u003cspan class=\"citation-914\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e4K Words for data table values\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-914 citation-end-914\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eMaximum Inter-Chassis Link Span\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003e\u003cspan class=\"citation-913\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003eUp to 152 meters (500 feet) utilizing 1770-CD line media\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-913 citation-end-913\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003ePhysical Enclosure Profile\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003e\u003cspan class=\"citation-912\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003eOpen-style structural module housing\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-912 citation-end-912\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eChassis Slot Allocation\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003e\u003cspan class=\"citation-911\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003eOccupies 1 Standard 1771 Universal I\/O Slot\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-911 citation-end-911\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOperating Temperature Range\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003e\u003cspan class=\"citation-910\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e0 to 60 °C (32 to 140 °F)\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-910 citation-end-910\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eStorage Temperature Limits\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003e\u003cspan class=\"citation-909\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e-40 to 85 °C (-40 to 185 °F)\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-909 citation-end-909\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eRelative Humidity Range\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003e\u003cspan class=\"citation-908\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e5 to 95% non-condensing\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-908 citation-end-908\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003chr\u003e\n\u003ch3\u003eSystem Compatibility and the 1785-BEM Expansion Module\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan\u003e\u003cstrong\u003e\u003cspan class=\"citation-907\"\u003eProcessor Compatibility Matrix:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"citation-907\"\u003e The 1785-BCM Series B (Revision C or later) supports an extensive range of PLC-5 platforms, including the PLC-5\/11, -5\/15, -5\/20, -5\/25, -5\/30, -5\/40, -5\/60, and PLC-5\/80\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-907 citation-end-907\"\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e. \u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-906\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003eLegacy Series A modules are restricted strictly to older PLC-5\/15 and PLC-5\/25 processors\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-906 citation-end-906\"\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003e\u003cstrong\u003e\u003cspan class=\"citation-905\"\u003e1785-BEM Backup Extension Module:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"citation-905\"\u003e While the base 1785-BCM handles up to two on-board channels (Channels 1A and 1B), high-tier processors like the PLC-5\/40 and PLC-5\/60 support four communication channels\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-905 citation-end-905\"\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e. \u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-904\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-904\"\u003eTo protect these extra ports, the \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"citation-904\"\u003e1785-BEM Backup Extension Module\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"citation-904\"\u003e must be installed adjacent to the BCM in the local rack\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-904 citation-end-904\"\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e. \u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-903\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003eThe 1785-BEM interfaces with the primary module across a local secondary backplane bus, expanding switching capacity to encompass Channels 2A and 2B\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-903 citation-end-903\"\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eCan I use a 1785-BCM Series B module together with an older Series A module?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cspan class=\"citation-902\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003eYes\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-902 citation-end-902\"\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e. \u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-901\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003eThe Series B module retains backwards compatibility and can be paired with an existing Series A unit\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-901 citation-end-901\"\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e. \u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-900\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003eTo enable this legacy mode, you must explicitly set the physical configuration switches on Switch Assembly SW1 and SW2 on the side and bottom of the Series B module\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-900 citation-end-900\"\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e. \u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-899\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003eIf these match properties are omitted, the module status LEDs will flash an error code\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-899 citation-end-899\"\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eCan standard local industrial I\/O modules be installed alongside the 1785-BCM?\u003c\/strong\u003e\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cspan class=\"citation-898\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003eNo\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-898 citation-end-898\"\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e. \u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-897\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003eThe PLC-5 backup system is designed to switch and protect remote I\/O networks; it cannot back up local I\/O modules placed directly in the processor's main rack\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-897 citation-end-897\"\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e. \u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-896\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003eTo protect the process against disruptions, all control instrumentation must reside in remote I\/O chassis, leaving the local chassis reserved strictly for the twin power supplies, processors, 1785-BCM, and optional 1785-BEM components\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-896 citation-end-896\"\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eWhat is the \"Fast Data Transfer\" mode on the 1785-BCM Series B module?\u003c\/strong\u003e\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cspan class=\"citation-895\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003eIn standard synchronous operations, when block-transfer write (BTW) and read (BTR) instructions mirror user data tables across the HSSL, the secondary processor waits until an entire multi-block data segment is successfully received before making it available\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-895 citation-end-895\"\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e. \u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-894\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003eEnabling \"Fast Data Transfer\" mode via Switch 2 on Switch Assembly SW1 allows the secondary module to instantly release individual blocks to the standby processor as they arrive\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-894 citation-end-894\"\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e. \u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-893\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003eThis shortens data table synchronization times significantly, dropping a 16-block (992 word) transfer time down from ~400–1000 ms to a fast 180–260 ms window\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-893 citation-end-893\"\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eField Commissioning and Network Wiring Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan\u003e\u003cstrong\u003e\u003cspan class=\"citation-892\"\u003eTrunk Shield Isolation:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"citation-892\"\u003e Link the communication networks between the primary and standby chassis with high-grade 1770-CD \"Blue Hose\" shielded twisted-pair cabling\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-892 citation-end-892\"\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e. \u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-891\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-891\"\u003eThe copper shield drain wire must remain continuous across all intermediate connections and be firmly bonded to the main enclosure earth ground bus bar at \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"citation-891\"\u003eonly one physical end\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"citation-891\"\u003e of the network loop\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-891 citation-end-891\"\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e. \u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-890\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003eGrounding the shield at multiple spots creates ground loop noise that corrupts high-speed data transmission\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-890 citation-end-890\"\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003e\u003cstrong\u003e\u003cspan class=\"citation-889\"\u003eAsynchronous Block Transfer Logic:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"citation-889\"\u003e Because data table mirroring transfers operate asynchronously to the ladder program scan, process engineers should always use the instruction Done bit (\u003c\/span\u003e\u003ccode\u003e\u003cspan class=\"citation-889\"\u003eDN\u003c\/span\u003e\u003c\/code\u003e\u003cspan class=\"citation-889\"\u003e) of the primary BTR or BTW command as part of the interlocking execution logic\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-889 citation-end-889\"\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e. \u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-888\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003eThis practice ensures that intermediate or corrupt values are not transmitted to the standby system if the primary controller experiences a failure mid-scan\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-888 citation-end-888\"\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003e\u003cstrong\u003e\u003cspan class=\"citation-887\"\u003eHazardous Isolation Protocol:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"citation-887\"\u003e The 1785-BCM is designed to permit live inspection and replacement of a faulted standby module without disrupting the online primary processor\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-887 citation-end-887\"\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e. \u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-886\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003eHowever, if the hardware assembly is deployed in hazardous industrial zones (Class I Division 2 explosive atmospheres), you must entirely de-energize the enclosure power lines or confirm the area is completely non-hazardous before extracting modules or unseating any field wiring arms to prevent electric arc-flash ignition risks\u003c\/span\u003e\u003cspan\u003e\u003cspan class=\"citation-886 citation-end-886\"\u003e\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003c\/h3\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":52695172317547,"sku":"1785-BCM","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/allen-bradley-1785-bcm-backup-communication-module-xext10wp5l3_976809d2-ee8f-4f3d-991f-7120aabf018e.jpg?v=1766114083"},{"product_id":"allen-bradley-1771-ob-plc-5-digital-dc-output-module","title":"Allen-Bradley 1771-OB PLC-5 Digital DC Output Module","description":"\u003cp\u003eThe \u003cstrong\u003e1771-OB\u003c\/strong\u003e is an 8-channel digital solid-state electronic device engineered for the \u003cstrong\u003ePLC-5 \/ 1771 I\/O Platform\u003c\/strong\u003e to drive low-voltage direct current industrial control hardware. It provides electrical switching paths for various field components, including DC motor drivers, status indicators, and industrial solenoid valves. The internal control micro-logic is energized via the local \u003cstrong\u003eI\/O chassis\u003c\/strong\u003e backplane rail, drawing a maximum current of 165 mA to maintain structural optoelectronic isolation between high-level plant field elements and core processor busses. System integration is established through the standard \u003cstrong\u003e1771-WA\u003c\/strong\u003e wiring arm connector assembly, permitting physical hot-swapping or card replacement sequences without disturbing landed field terminal connections.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Density Output Distribution\u003c\/strong\u003e: Integrates eight independent solid-state DC switching circuits within a single-slot chassis package.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDedicated Short-Circuit Protection\u003c\/strong\u003e: Individual 2 A, 8AG protective fuses mounted per channel safeguard the module against severe field overcurrent hazards.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual Status Array\u003c\/strong\u003e: Equipped with nine front-panel diagnostic LEDs providing localized visualization of blown-fuse status and specific channel conduction states.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect Input Interlocking\u003c\/strong\u003e: Supports zero-potential ground reference looping to directly drive discrete DC input modules, such as the 1771-IB receiver block.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptoelectronic Backplane Protection\u003c\/strong\u003e: Incorporates continuous 1500 Vca (rms) galvanic isolation to prevent destructive external voltage transients from damaging backplane control logic.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMechanical Slot Keying\u003c\/strong\u003e: Backplane socket keying fields restrict module slot alignment, ensuring only matched electrical module types sit within defined wiring nests.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDistributed control of factory floor solenoid-actuated pneumatic manifolds.\u003c\/li\u003e\n\u003cli\u003eDirect activation of low-current DC motor speed control enable drives.\u003c\/li\u003e\n\u003cli\u003eRemote instrumentation control panels and pilot lamp illumination matrix lines.\u003c\/li\u003e\n\u003cli\u003eInter-rack logic interlocking with low-voltage input hardware sub-assemblies.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eManufacturer\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley \/ Rockwell Automation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1771-OB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct Series\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePLC-5 \/ 1771 I\/O\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModule Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDigital DC Output Driver Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutputs Per Module\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eChassis Compatibility\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1771 I\/O Chassis\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInput Operational Voltage Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10 Vdc to 27 Vdc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutput Current Capacity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1.5 A per individual output (not to exceed 8 A total per module)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaximum Current Surge\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4 A for 1 ms, repeatable at 1 s intervals\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOff-State Leakage Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 mA maximum per output\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOn-State Voltage Drop\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2 Vdc maximum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSignal Transmission Delay\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10 ms (On to Off and Off to On states)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePower Dissipation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.9 Watts minimum, 16.9 Watts maximum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eThermal Dissipation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3.0 BTU\/h minimum, 57.6 BTU\/h maximum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBackplane Logic Current Demand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e165 mA @ 5 Vdc plus\/minus 5%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOptoelectric Isolation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1500 Vca (rms)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Temperature Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0 degC to 60 degC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStorage Temperature Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-40 degC to 85 degC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRelative Ambient Humidity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5% to 95% (non-condensing)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eField Wiring Specifications\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFlexible cable with 1.5 mm2 nominal cross-section\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBackplane Plastic Keying Slots\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBetween positions 4 and 6, and between positions 18 and 20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInternal Fusing\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2 A, 8AG rating (one individual fuse per output path)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTerminal Connection Block\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1771-WA Wiring Arm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eConnections\/Interfaces\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eConnector Terminal Pin\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eFunction\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTerminal A\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e+DC Voltage Supply Input Reference\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTerminal 0\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDigital Output Channel 0 Signal Line\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTerminal 1\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDigital Output Channel 1 Signal Line\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTerminal 2\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDigital Output Channel 2 Signal Line\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTerminal 3\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDigital Output Channel 3 Signal Line\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTerminal 4\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDigital Output Channel 4 Signal Line\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTerminal 5\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDigital Output Channel 5 Signal Line\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTerminal 6\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDigital Output Channel 6 Signal Line\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTerminal 7\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDigital Output Channel 7 Signal Line\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTerminal B\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDC Common Ground Return Reference\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eEngineering Notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTerminal to Bit Discrepancy\u003c\/strong\u003e: The terminal channel designations etched on the physical 1771-WA wiring arm hardware do not directly map to software internal image register data bits. Refer strictly to the system allocation table when building control code.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePotential Equalization\u003c\/strong\u003e: When cross-linking an output channel directly into an input processing unit (such as a 1771-IB), a common power supply loop must feed both blocks to tie all reference grounds to an identical voltage potential.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePolarity Critical Warning\u003c\/strong\u003e: Correct structural polarity must be maintained on all direct current power terminals. Applying alternating current (AC) power configurations or cross-wiring polarity rails will result in critical module hardware destruction.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBackplane Power Balancing\u003c\/strong\u003e: The 165 mA backplane current consumption must be calculated into the aggregate power supply capacity budget of the specific 1771 chassis rack to avoid thermal overloading or backplane dip errors.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eField Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectrostatic Grounding Procedures\u003c\/strong\u003e: Operators must latch an approved ESD wrist grounding strap to a structural physical ground point or discharge local potentials by touching an earth-grounded steel frame before touching card edges.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlastic Keying Installation\u003c\/strong\u003e: Ensure the chassis backplane keying pegs are properly seated at the factory positions (between pins 4\/6 and pins 18\/20) to prevent the accidental insertion of mismatched voltage cards.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChassis De-energization\u003c\/strong\u003e: Complete chassis rack power downcycles are required prior to sliding the driver module out of its physical slot to protect operators and prevent inductive backplane transients.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuse Extraction Protocol\u003c\/strong\u003e: To safely swap a compromised fuse assembly, release the front mechanical swing arm latch, withdraw the board housing, undo the two case retention screws, and replace the spent 2 A, 8AG component inside.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical \u0026amp; Procurement FAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What specific fuse replacement specification must be used if a channel drops out?\u003c\/strong\u003e A: Each individual output switch is paired with a standard 2 A, 8AG form-factor fuse accessible underneath the card side cover.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can this DC driver module be safely slotted into the leftmost slot of a 1771 chassis?\u003c\/strong\u003e A: No, the far-left slot of the 1771 chassis configuration is structurally reserved for the master processor module or remote I\/O network adapter head.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does the module display indicators on the front face for individual circuit diagnostics?\u003c\/strong\u003e A: Yes, it features one dedicated red LED for blown fuse notification alongside eight individual red status LEDs that light up when an output channel is actively energized.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":52695182606699,"sku":"1771-OB","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/allen-bradley-1771-ob-digital-dc-output-driver-module-3votzyt5u4d_51486138-8d7c-4a78-b921-cc00c9f77c03.jpg?v=1766114346"},{"product_id":"allen-bradley-1785-v80b-plc-5-v80-vme-processor","title":"Allen-Bradley 1785-V80B PLC-5\/V80 VME Processor","description":"\u003cp\u003eThe \u003cstrong\u003e1785-V80B\u003c\/strong\u003e is a specialized \u003cstrong\u003ePLC-5\/V80\u003c\/strong\u003e programmable logic controller designed for seamless, direct integration into a VMEbus architecture. Compliant with the C.1 VMEbus specification, this processor installs directly into a VMEbus backplane, allowing shared bus execution alongside other VMEbus CPU and I\/O modules without separate system gateways. It retains the complete, powerful instruction set of the enhanced PLC-5\/80 processor while expanding native execution through custom VME status files and extended message (\u003cstrong\u003eMSG\u003c\/strong\u003e) instructions that handle cross-bus data transfers and hardware interrupt generation. Operating with 100 Kilowords of onboard battery-backed SRAM, the unit manages comprehensive industrial applications up to 2944 total I\/O over dedicated \u003cstrong\u003eDH+\u003c\/strong\u003e and Universal Remote I\/O links, complemented by an optically isolated RS-232-C serial engine for local programming and DF1 point-to-point topologies.\u003c\/p\u003e\n\u003ch3\u003eOrdering Information\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1785-V80B\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003ePLC-5\/V80 VMEbus Programmable Logic Controller Processor, 100 kWord SRAM.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eRevision Control\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1785-V80B Ser A\u003c\/strong\u003e (Series A, Rev A)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1785-V80B Ser B\u003c\/strong\u003e (Series B, Rev B)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1785-V80B Ser C\u003c\/strong\u003e (Series C, Rev C)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1785-V80B Ser D\u003c\/strong\u003e (Series D, Rev D)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1785-V80B Ser E\u003c\/strong\u003e (Series E, Rev E)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eManufacturer\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley \/ Rockwell Automation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePLC-5\/V80\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart Number \/ Catalog No.\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1785-V80B\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eUPC\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e612598140213\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModule Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eVME Processor Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eVMEbus Standard\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCompliant with C.1 VMEbus specification\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOnboard Volatile Memory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100 Kilowords SRAM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eData Table Limit\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e32,000 words maximum per data table file\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNon-Volatile Storage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDoes not utilize EEPROM memory modules\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax Total I\/O Capacity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2944 (configured complementarily as 2944 input \/ 2955 output)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax Analog I\/O Capacity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2944 addressed natively (3072 maximum system capacity)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTypical Bit Logic Scan Time\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.5 ms per 1000 words\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTypical Complex Scan Time\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2.0 ms per 1000 words\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eExtended Local I\/O Scan Time\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.5 ms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRemote I\/O Scan Time Per Rack\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10 ms @ 57.6 kbps, 7 ms @ 115.2 kbps, 3 ms @ 230.4 kbps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRemote Network Baud Rates\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e57.6 kbps, 115.2 kbps, 230.4 kbps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax Remote I\/O Racks\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e23\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax Universal Remote Chassis\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e92 total (maximum 32 per physical I\/O link)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax Total I\/O Chassis\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e93\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eExtended Local Chassis Limit\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0 (No extended local I\/O ports available)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eControl Coprocessor Port\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eVME Backplane Requirement\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2.5 Amperes @ 5 Vdc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct Net Weight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.82 kg (1.81 lbs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eEngineering Notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eVME Status File Access\u003c\/strong\u003e: Features an exclusive software-defined \"VME status file\" that enables ladder programs to explicitly monitor, evaluate, and modify low-level VMEbus system variables.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstruction Set Extensions\u003c\/strong\u003e: The standard ladder instruction block for messaging (\u003cstrong\u003eMSG\u003c\/strong\u003e) is extended natively to command VMEbus data block transfers and issue structured backplane hardware interrupts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCode Portability\u003c\/strong\u003e: Program configurations and ladder logic files developed for the standard enhanced PLC-5\/40 or PLC-5\/80 platforms run directly on the 1785-V80B with matching execution baselines.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSRAM Preservation\u003c\/strong\u003e: Because this hardware platform does not feature internal EEPROM burning options, an active backup battery asset is required on the backplane or processor assembly to protect logic data during power downcycles.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eField Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBackplane Insertion\u003c\/strong\u003e: Verify the host VMEbus chassis power is fully switched off before inserting or extracting the processor card. Seat the multi-pin DIN backplane connectors straight into the card guide tracks to avoid pin misalignment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChannel 0 Connection\u003c\/strong\u003e: Pin assignments on the 25-pin D-shell serial interface match EIA RS-232-C protocols; ensure shielding braid is terminated to the connector hood to maintain the integrity of optical isolators under high noise conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNetwork Tuning\u003c\/strong\u003e: When configuring channels 1A, 1B, 2A, or 2B for Data Highway Plus (DH+) or Remote I\/O, ensure the end-of-line termination resistors match the physical baud rate selected (e.g., 150 Ohm for 57.6 kbps or 82 Ohm for 230.4 kbps setups).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProgramming Access\u003c\/strong\u003e: Local workstation access is established via the two front-panel 8-pin mini-DIN peripheral connections or over the primary DH+ highway link.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical \u0026amp; Procurement FAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can a standard Allen-Bradley EEPROM module be inserted into the 1785-V80B for non-volatile backup?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: No, the 1785-V80B VME processor does not incorporate sockets or system architecture to accept EEPROM memory modules.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How are communication channels 1A, 1B, 2A, and 2B physically wired on the front panel?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Each of these four independent channels features a dedicated 3-pin phoenix-style terminal plug that can be individually configured for DH+, Remote I\/O Scanner, or Remote I\/O Adapter modes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can this processor module drive standard local 1771 I\/O chassis blocks?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: It cannot drive local or extended local I\/O chassis directly because it lacks extended local drive ports; all 1771 or external I\/O hardware must be linked remotely over the universal remote I\/O scanner networks or over the VMEbus backplane.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":52695183360363,"sku":"1785-V80B","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/allen-bradley-1785-v80b-vme-processor-card-24thwjxkimd_27f243e0-23d0-4b07-9175-0fa9f9f49a33.jpg?v=1766114374"},{"product_id":"allen-bradley-1785-l40e-ethernet-plc-5-programmable-controller","title":"Allen-Bradley 1785-L40E Ethernet PLC-5 Programmable Controller","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe \u003cspan\u003e1785-L40E\u003c\/span\u003e is a high-performance, single-slot \u003cspan\u003eEthernet PLC-5 Programmable Controller\u003c\/span\u003e designed for the Allen-Bradley 1771 Universal I\/O platform. It features an integrated Ethernet port (10 Mbps), enabling high-speed peer-to-peer communication, program uploads\/downloads, and data acquisition over standard office or industrial networks. With \u003cspan\u003e48k words of user memory\u003c\/span\u003e and the capacity to manage up to \u003cspan\u003e2048 I\/O points\u003c\/span\u003e, the 1785-L40E serves as a robust control solution for medium-to-large scale industrial applications that require seamless integration between the factory floor and enterprise-level Ethernet systems.\u003c\/p\u003e\n\u003ch3\u003eFunctional Communication \u0026amp; Logic\u003c\/h3\u003e\n\u003cp\u003eThe \u003cspan\u003e1785-L40E\u003c\/span\u003e simplifies network architecture by eliminating the need for external bridge modules. It features three high-speed communication channels: \u003cspan\u003eone dedicated Ethernet port\u003c\/span\u003e and \u003cspan\u003etwo configurable DH+\/Remote I\/O ports\u003c\/span\u003e. This allows the controller to simultaneously manage a local 1771 chassis, coordinate with remote I\/O racks, and communicate with HMIs or SCADA systems via EtherNet\/IP. Its powerful instruction set supports advanced floating-point math, PID control, and complex data handling, making it a \"workhorse\" for the automotive, food and beverage, and material handling industries.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"692\"\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003cth\u003e\u003cspan\u003eAttribute\u003c\/span\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cspan\u003eSpecification Details\u003c\/span\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eModel\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1785-L40E\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eUser Memory\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e48k Words\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eTotal I\/O (Max)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2048 (Any mix) or 4096 (Complementary)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eCommunication Ports\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1 Ethernet, 2 DH+ or Remote I\/O\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eMax Remote Chassis\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e60\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eBackplane Current Load\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e3.6 A @ 5V DC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003ePower Dissipation\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e18.9 W (Max)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eOperating Temp\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0 °C to +60 °C (32 °F to +140 °F)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eWeight\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1.39 kg (3 lb, 1 oz)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eReplacement Battery\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1770-XYC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cspan class=\"mat-mdc-button-persistent-ripple mdc-button__ripple\"\u003e\u003c\/span\u003e\u003cspan class=\"mdc-button__label\"\u003e\u003cspan class=\"export-sheets-button\"\u003e\u003cspan class=\"export-sheets-icon\"\u003e\u003c\/span\u003e\u003cspan\u003e导出到 Google 表格\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"mat-focus-indicator\"\u003e\u003c\/span\u003e\u003cspan class=\"mat-mdc-button-touch-target\"\u003e\u003c\/span\u003e\u003cspan class=\"mat-mdc-button-persistent-ripple mdc-icon-button__ripple\"\u003e\u003c\/span\u003e\u003cspan class=\"mat-focus-indicator\"\u003e\u003c\/span\u003e\u003cspan class=\"mat-mdc-button-touch-target\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003eTechnical FAQs\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eHow does the Ethernet port improve system integration?\u003c\/span\u003eThe built-in Ethernet port supports the \u003cspan\u003eEtherNet\/IP\u003c\/span\u003e protocol, allowing the 1785-L40E to connect directly to standard network infrastructure. This facilitates faster data rates compared to traditional DH+ and allows for remote troubleshooting and programming across the plant's LAN without specialized interface cards in the PC.\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWhat are the addressing limitations for I\/O modules?\u003c\/span\u003eThe controller supports 2-slot, 1-slot, and 1\/2-slot addressing. When using \u003cspan\u003e2-slot addressing\u003c\/span\u003e, 16-point modules must be used in I\/O pairs, and 32-point modules are not supported. For higher density requirements, \u003cspan\u003e1\/2-slot addressing\u003c\/span\u003e should be used, which allows any mix of 8, 16, or 32-point modules.\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eHow critical is the 1770-XYC battery?\u003c\/span\u003eThe \u003cspan\u003e1770-XYC\u003c\/span\u003e lithium battery is essential for backing up the 48k words of user memory and the real-time clock when the system is powered down. Without a functional battery, the program and configuration data will be lost during a power cycle.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eField Engineering \u0026amp; Installation Guide\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eChassis Selection:\u003c\/span\u003e The 1785-L40E must be installed in the \u003cspan\u003eleftmost slot\u003c\/span\u003e of a 1771-A1B, -A2B, -A3B, or -A4B Universal I\/O chassis. Ensure the backplane power supply is rated for at least \u003cspan\u003e3.6 A\u003c\/span\u003e to accommodate the controller's current draw.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eEnvironmental Shielding:\u003c\/span\u003e While the controller is rated for \u003cspan\u003e0 to 60 °C\u003c\/span\u003e, it is an open-style module. It must be installed in a NEMA-rated industrial enclosure to meet \u003cspan\u003eCISPR 11 Class A\u003c\/span\u003e emissions standards and to protect against conductive dust and moisture.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCable Selection:\u003c\/span\u003e For Ethernet connectivity, use 802.3 compliant shielded or unshielded twisted pair cabling. For Remote I\/O or DH+ networks, use \u003cspan\u003e1770-CD (Blue Hose)\u003c\/span\u003e cable to ensure signal integrity and impedance matching across long distances.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eEngineering Advantages\u003c\/h3\u003e\n\u003cp\u003eThe \u003cspan\u003e1785-L40E\u003c\/span\u003e represents a bridge between legacy reliability and modern connectivity. By integrating Ethernet directly into the proven PLC-5 architecture, Allen-Bradley provides an upgrade path that does not require replacing the entire 1771 I\/O infrastructure. For B2B procurement, sourcing an original \u003cspan\u003e1785-L40E\u003c\/span\u003e ensures compliance with \u003cspan\u003eUL, CSA, and CE\u003c\/span\u003e industrial standards, providing the high vibration (2 g) and shock (30 g) resistance required for the most demanding manufacturing environments.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":52695191388523,"sku":"1785-L40E","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/allen-bradley-1785-l40e-cpu-module-kxser2dhzfv_9290a747-4043-42d8-8c69-030ea48e06d6.jpg?v=1766114643"},{"product_id":"1785-enet-c-allen-bradley-plc-5-ethernet-interface-module","title":"1785-ENET\/C Allen-Bradley PLC-5 Ethernet Interface Module","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview and Connectivity Evolution\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1785-ENET\/C (1785ENET\/C)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis a high-performance communication interface specifically designed for the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003ePLC-5\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eseries of controllers. It serves as a critical bridge between the legacy PLC-5 backplane and modern\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eEtherNet\/IP\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003enetworks. The \"Series C\" designation represents the most advanced and stable hardware revision, offering superior packet processing and reliability. By adding the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1785-ENET\/C\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eto a PLC-5 system, industrial facilities can integrate their legacy control architecture with contemporary SCADA, MES, and ERP systems without the high cost of a total processor migration. This module enables remote programming, data acquisition, and controller-to-controller interlocking over standard industrial Ethernet infrastructure.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eHardware Architecture and Network Logic\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1785-ENET\/C\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis a \"side-car\" style module that attaches to the left side of a PLC-5 processor. It does not occupy a standard I\/O slot, preserving chassis space for field I\/O.\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCommunication Port:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eFeatures one\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e10Base-T (RJ45)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eport for standard twisted-pair Ethernet cabling and one\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAUI (15-pin)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eport for older transceiver-based connections.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eProtocol Support:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ePrimarily utilizes\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eCSP (Client\/Server Protocol)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eand\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eEtherNet\/IP\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003efor messaging. It supports both peer-to-peer messaging (MSG instructions) and remote programming via RSLinx.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eThroughput Capacity:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eOptimized for \"Messaging\" rather than \"I\/O Control.\" It is best suited for uploading\/downloading programs and exchanging data packets with other PLCs or HMIs.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eWorks with most\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003ePLC-5\/20, 5\/40, and 5\/80\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eprocessors, provided the processor has the appropriate side-car interface connector.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003e1785-ENET\/C\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eManufacturer\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eAllen-Bradley \/ Rockwell Automation\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eNetwork Speed\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e10 Mbps (Half-duplex)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eConnectors\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1x RJ45 (10Base-T), 1x 15-pin AUI\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eMax TCP\/IP Connections\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eUp to 64\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBackplane Current\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1.0 A @ 5.1 VDC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eProgramming Support\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eRSLogix 5, RSLinx Classic\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOperating Temp\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0 to 60 Celsius\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eIsolation\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e500 VDC between network and backplane\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eShipping Weight\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003e1.2 kg\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003cstrong\u003eIntegrated Technical FAQ\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhy does the module only support 10 Mbps instead of 100 Mbps?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1785-ENET\/C\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ewas designed during the peak of the PLC-5 era when\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e10Base-T\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ewas the industrial standard. While slower than modern modules, 10 Mbps is more than sufficient for the data table sizes found in PLC-5 processors (typically 32K to 100K words).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I set the IP address for this module?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe IP address is generally assigned using the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eBOOTP\/DHCP Utility\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003efrom Rockwell Automation. Once the MAC address is detected and an IP is assigned, you must \"Disable BOOTP\" in the configuration to make the address permanent (static).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use this module for high-speed I\/O control?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. The\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1785-ENET\/C\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis designed for\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003emessaging and programming\u003c\/strong\u003e. For Ethernet-based I\/O control (EtherNet\/IP I\/O), the PLC-5 system typically requires a newer\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1771-AENTR\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eor a migration to the ControlLogix platform.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eEngineering \u0026amp; Installation Protocols\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSide-Car Mechanical Connection:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eBefore applying power, ensure the side-car connector pins are perfectly aligned with the PLC-5 processor. Secure the modules together using the integrated sliding latches. Forcing the connection can result in bent pins and permanent hardware failure.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eNetwork Topology:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eSince the module is\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e10 Mbps half-duplex\u003c\/strong\u003e, it is highly sensitive to network \"collisions.\" For optimal performance, connect the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1785-ENET\/C\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eto a managed switch that can be forced to\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e10MB\/Half\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eon that specific port to avoid auto-negotiation mismatches.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eStatus LED Diagnostics:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e*\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eENET LED:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eSolid Green indicates a valid link.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003ePROC LED:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eSolid Green indicates the module is communicating with the PLC-5 processor.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eFLT LED:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eRed indicates a hardware internal fault or an IP address conflict.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eEngineering Advantages\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1785-ENET\/C\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eprovides a \"Life Extension\" for the thousands of PLC-5 systems still in operation today. Its primary advantage is\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003econnectivity without disruption\u003c\/strong\u003e. Engineers can install the module to extract real-time production data for \"Smart Factory\" initiatives without altering the core machine logic. Furthermore, the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eSeries C\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ehardware includes improved firmware that handles modern network traffic more efficiently than the older Series A or B units, providing a more stable connection for remote troubleshooting and enterprise-level reporting.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":52695192699243,"sku":"1785-ENET\/C","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/allen-bradley-1785-enet-c-ethernet-interface-module-adj3ktrdzwt_b0fdc670-825a-41f9-8d64-36dbec7558fb.jpg?v=1766114691"},{"product_id":"1771-ife-allen-bradley-plc-5-analog-input-module-16-channel","title":"1771-IFE Allen-Bradley PLC-5 Analog Input Module (16-Channel)","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview and Analog Data Acquisition\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1771-IFE (1771IFE)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis a high-density, intelligent analog input module belonging to the legendary\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen-Bradley PLC-5\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eseries. Designed for precision data acquisition in heavy industrial environments—such as oil refineries, wastewater treatment plants, and steel mills—the module provides up to\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e16 single-ended\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eor\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e8 differential\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003einputs. It is engineered to convert continuous analog signals (voltage or current) into digital values that can be processed by the PLC-5 processor. The\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1771-IFE\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis a cornerstone for monitoring critical process variables like pressure, flow, temperature, and level, offering a robust hardware solution that has maintained its reliability in the field for decades.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eHardware Architecture and Signal Interfacing\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1771-IFE\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eutilizes a modular chassis-based design and occupies a single slot in the 1771 I\/O rack. It interfaces with the PLC backplane through block transfer programming, ensuring high-speed data updates without overloading the processor's discrete I\/O scan.\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eConfigurable Input Ranges:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe module is highly versatile, supporting a wide array of signal types including\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1 to 5 VDC, 0 to 5 VDC, 0 to 10 VDC, and -10 to +10 VDC\u003c\/strong\u003e, as well as\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e4 to 20 mA\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ecurrent loops (using external shunt resistors).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eA\/D Conversion:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eFeatures a 12-bit Analog-to-Digital converter, providing a resolution of\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e4096 counts\u003c\/strong\u003e, which ensures high granularity for sensitive process control.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eInput Filtering:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIncludes hardware-based low-pass filtering to suppress high-frequency noise and 50\/60 Hz electrical interference common in industrial motor control centers.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eIsolation Logic:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eProvides optical isolation between the analog input circuitry and the backplane logic, protecting the PLC processor from external field transients and ground loops.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003e1771-IFE\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eManufacturer\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eAllen-Bradley \/ Rockwell Automation\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eInput Channels\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e16 Single-ended or 8 Differential\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eResolution\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e12-bit (0 to 4095)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eVoltage Ranges\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0 to 5V, 1 to 5V, 0 to 10V, +\/- 10V\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eCurrent Ranges\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e4 to 20 mA (With 249 Ohm resistor)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eConversion Type\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eSuccessive Approximation\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBackplane Current\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e750 mA @ 5 VDC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOperating Temp\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0 to 60 Celsius\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eIsolation\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1500 VAC (Continuous)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eShipping Weight\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003e1.5 kg\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003cstrong\u003eIntegrated Technical FAQ\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I configure the module for 4 to 20 mA current inputs?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1771-IFE\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis natively a voltage-sensing module. To measure\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e4 to 20 mA\u003c\/strong\u003e, you must install a precision\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e249 Ohm shunt resistor\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eacross the input terminals and configure the software range for 1 to 5 VDC.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between Single-Ended and Differential wiring?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSingle-ended wiring (16 channels) uses a common ground for all inputs and is suitable for signals with a shared reference. Differential wiring (8 channels) uses two leads per signal to cancel out common-mode noise, making it the preferred choice for long cable runs in electrically noisy areas.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow does \"Block Transfer\" (BTW\/BTR) affect module operation?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eUnlike discrete I\/O, analog data is too large for a single scan. You must use\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eBlock Transfer Write (BTW)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eto send configuration data (ranges, filters) to the module and\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eBlock Transfer Read (BTR)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eto pull the digitalized analog values into the PLC-5 data table.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eEngineering \u0026amp; Installation Protocols\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWiring Arm Configuration:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eUse the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1771-WG\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ewiring arm to allow for module replacement without disconnecting field wiring. Ensure that all terminal screws are tightened to\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e0.9 Nm\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eto prevent signal drift caused by loose connections.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eShielding Strategy:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eAlways use twisted-pair shielded cable for analog signals. Connect the shield at the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003ePLC-5 chassis ground\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eonly; do not ground the shield at the sensor end to avoid creating ground loops that can cause significant measurement offsets.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCalibration Cycle:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eWhile the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1771-IFE\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis factory calibrated, it is recommended to perform a field calibration check every 12 months using a high-precision signal generator to account for component aging and environmental drift.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eEngineering Advantages\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1771-IFE\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eremains a staple in\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003elegacy migration and maintenance\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003estrategies. Its high-density 16-channel capacity allows for significant I\/O concentration, reducing the number of chassis slots required for large-scale monitoring. The module's diagnostic capabilities—including \"Out of Range\" bit detection—provide immediate feedback to the control logic, allowing for automated fail-safe routines in the event of a sensor failure or wire break, thereby enhancing overall plant safety and uptime.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":52695193190763,"sku":"Allen Bradley 1771-IFE","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/allen-bradley-1771-ife-analog-input-module-o5ymi2u0t0q_277bfeb9-0c72-4a07-bb27-cb016050914d.jpg?v=1766114709"}],"url":"https:\/\/www.plcprotech.com\/collections\/allen-bradley-plc-5-system.oembed","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}