{"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","url":"https:\/\/www.plcprotech.com\/products\/1785-enet-c-allen-bradley-plc-5-ethernet-interface-module","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}