{"product_id":"allen-bradley-1771-ig-ttl-digital-dc-input-module","title":"Allen-Bradley 1771-IG TTL Digital DC Input Module","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\n\u003cp\u003eThe Allen-Bradley 1771-IG is a TTL Digital DC Input Module designed for the PLC-5 and 1771 I\/O platform. This module effectively converts DC signals from various user-supplied automation devices to the logic levels required by the processor, managing the corresponding bit states within the PLC data table. It is engineered specifically for transistor-transistor logic (TTL) and binary-coded decimal (BCD) interface encoder applications, making it well-suited for high-precision industrial data acquisition and positioning setups.\u003c\/p\u003e\n\u003cp\u003eConstructed for reliable operation within standard 1771 I\/O chassis, the 1771-IG integrates features to safeguard logic integrity against electrical noise. It includes provisions for a 1771-WC wiring arm, enabling simplified module replacement and maintenance without requiring the disconnection of field wiring.\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible with Allen-Bradley PLC-5 systems and standard 1771 I\/O chassis architecture\u003c\/li\u003e\n  \u003cli\u003eDesigned for 5VDC TTL and BCD interface encoder applications\u003c\/li\u003e\n  \u003cli\u003eIncludes wiring arm compatibility (1771-WC) for fast module replacement without rewiring\u003c\/li\u003e\n  \u003cli\u003eOptical isolation between field input signals and the system backplane\u003c\/li\u003e\n  \u003cli\u003eConformal-coated circuit boards for enhanced durability in harsh industrial environments\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eTTL encoder interfacing and position feedback monitoring\u003c\/li\u003e\n  \u003cli\u003eBCD switch data reading\u003c\/li\u003e\n  \u003cli\u003eHigh-speed digital DC signal conversion in PLC-5 architectures\u003c\/li\u003e\n  \u003cli\u003eLegacy discrete automation and process control systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eParameter\u003c\/th\u003e\n      \u003cth\u003eSpecification\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eManufacturer\u003c\/td\u003e\n      \u003ctd\u003eAllen-Bradley \/ Rockwell Automation\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eExact Model\u003c\/td\u003e\n      \u003ctd\u003e1771-IG\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eProduct Type\u003c\/td\u003e\n      \u003ctd\u003eTTL Digital DC Input Module\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eSeries\u003c\/td\u003e\n      \u003ctd\u003ePLC-5 \/ 1771 I\/O Platform\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eVoltage Category\u003c\/td\u003e\n      \u003ctd\u003e5VDC (TTL)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eOperating Voltage Range\u003c\/td\u003e\n      \u003ctd\u003e5.0 to 5.3 VDC\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eBackplane Current Draw\u003c\/td\u003e\n      \u003ctd\u003e122 mA\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eIsolation Voltage\u003c\/td\u003e\n      \u003ctd\u003e1,500 VAC rms between input and backplane\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eInput Signal Delay\u003c\/td\u003e\n      \u003ctd\u003eLess than 1 ms\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMounting\u003c\/td\u003e\n      \u003ctd\u003eChassis \/ Rack Mount (1771 I\/O Base)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eCountry of Origin\u003c\/td\u003e\n      \u003ctd\u003eUnited States\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eConnections \/ Interfaces\u003c\/h3\u003e\n\u003cp\u003eThe 1771-IG module connects to field devices via a removable 1771-WC wiring arm attached to the front of the I\/O chassis. This interface secures all sensor signal wiring, allowing the electronic module to be inserted or removed from the backplane without disturbing field terminations. Backplane communication and power are established directly through the module's rear edge connector when seated in the 1771 chassis.\u003c\/p\u003e\n\n\u003ch3\u003eInstallation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n  \u003cli\u003eEnsure all power to the 1771 I\/O chassis and associated rack power supply is turned off before installing or removing the module.\u003c\/li\u003e\n  \u003cli\u003eVerify that the chassis backplane power requirements are not exceeded by adding this module.\u003c\/li\u003e\n  \u003cli\u003eMount the 1771-WC wiring arm to the swing-bar on the front of the chassis slot.\u003c\/li\u003e\n  \u003cli\u003eAlign the 1771-IG module with the chassis guides and slide it smoothly into the designated slot until firmly seated against the backplane connector.\u003c\/li\u003e\n  \u003cli\u003eSecure the module using top and bottom retaining latches and swing the wiring arm into place.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eCompliance and Certifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eUL Listed Industrial Control Equipment\u003c\/li\u003e\n  \u003cli\u003eCSA Certified\u003c\/li\u003e\n  \u003cli\u003eCE compliant for applicable directives\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":53770308977003,"sku":"1771-IG","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/1771-IG_1200x1200_8227482f-bbef-40ce-8085-f49cf7694710.jpg?v=1787740955","url":"https:\/\/www.plcprotech.com\/products\/allen-bradley-1771-ig-ttl-digital-dc-input-module","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}