{"product_id":"allen-bradley-1771-ia-plc-5-discrete-input-module","title":"Allen-Bradley 1771-IA PLC-5 Discrete Input Module","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\n\u003cp\u003eThe Allen-Bradley 1771-IA is a legacy discrete input module designed for operation within the PLC-5 and 1771 I\/O platform architectures. This standard AC\/DC input module provides reliable sensing for industrial control applications, featuring built-in input filtering to minimize the effects of voltage transients caused by contact bounce and radiated electrical noise. It interfaces directly with field devices such as pushbuttons, limit switches, and AC proximity sensors.\u003c\/p\u003e\n\u003cp\u003eThe module receives operational power directly through the 1771 I\/O chassis backplane from the system power supply, drawing 75 mA of backplane current. Mechanical keying bands on the backplane connector align with slotted cutouts on the module circuit board to prevent improper insertion into unauthorized chassis slots, protecting connected hardware from configuration errors.\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible with standard Allen-Bradley 1771 I\/O chassis and PLC-5 control systems\u003c\/li\u003e\n  \u003cli\u003eSupports nominal input voltages of 120 VAC (47 to 63 Hz) and 125 VDC\u003c\/li\u003e\n  \u003cli\u003eBuilt-in input filtering with nominal filtering delays for enhanced noise immunity\u003c\/li\u003e\n  \u003cli\u003eOptical isolation between field input and backplane logic circuitry\u003c\/li\u003e\n  \u003cli\u003eMechanical keying slots to prevent incorrect module placement in the chassis\u003c\/li\u003e\n  \u003cli\u003eCompatible with AC proximity switches and low leakage current field devices\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cp\u003eThe Allen-Bradley 1771-IA module is deployed in industrial automation systems utilizing the PLC-5 platform. Typical applications include monitoring status signals from limit switches, pushbuttons, selector switches, electronic proximity sensors, and auxiliary relay contacts in discrete manufacturing, material handling, and process control environments.\u003c\/p\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-IA\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eProduct Type\u003c\/td\u003e\n      \u003ctd\u003eDiscrete Input Module\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003ePlatform\u003c\/td\u003e\n      \u003ctd\u003ePLC-5 \/ 1771 I\/O System\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eNominal Input Voltage\u003c\/td\u003e\n      \u003ctd\u003e120 VAC (47 to 63 Hz) \/ 125 VDC\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eOn-State Voltage Range\u003c\/td\u003e\n      \u003ctd\u003e87 to 138 VAC \/ 97 to 138 VDC\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMax Off-State Voltage\u003c\/td\u003e\n      \u003ctd\u003e46 VAC peak \/ 57 VDC\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMax Off-State Current\u003c\/td\u003e\n      \u003ctd\u003e2.8 mA AC peak or DC\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eBackplane Current Draw\u003c\/td\u003e\n      \u003ctd\u003e75 mA\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003ePower Dissipation\u003c\/td\u003e\n      \u003ctd\u003e0.4 to 10.7 W\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eThermal Dissipation\u003c\/td\u003e\n      \u003ctd\u003e1.4 to 36.5 BTU\/hr\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eIsolation\u003c\/td\u003e\n      \u003ctd\u003e1 kVAC rms opto-electrical isolation\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-IA module connects to field wiring via a removable terminal block or swing-arm connected to the front of the 1771 I\/O chassis wiring arm. The rear edge features physical slots designed to match keying bands on the backplane connector, ensuring the module can only be inserted into compatible I\/O chassis slots.\u003c\/p\u003e\n\n\u003ch3\u003eInstallation Guidelines\u003c\/h3\u003e\n\u003cp\u003eEnsure all power to the 1771 I\/O chassis is removed before installing or removing the module. Verify that the backplane keying bands correspond exactly to the slots on the rear edge of the module circuit board. Calculate total backplane current requirements across all installed modules in the chassis to prevent power supply overload.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":53770311860587,"sku":"1771-IA","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/1771-IA_1200x1200_dc7e4325-1d16-4f29-8b6f-ce9c189eed83.jpg?v=1787741069","url":"https:\/\/www.plcprotech.com\/products\/allen-bradley-1771-ia-plc-5-discrete-input-module","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}