{"product_id":"1771-iad-allen-bradley-digital-input-module","title":"1771-IAD Allen-Bradley Digital Input Module","description":"\u003ch2\u003eAllen-Bradley 1771-IAD Digital AC\/DC Input Module\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1771-IAD\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1771-IAD\u003c\/strong\u003e Digital AC\/DC Input Module, operates as a dedicated hardware component for discrete signal acquisition within PLC-5 control systems. It receives 120 VAC \/ 125 VDC field input signals and transfers status data through the 1771 chassis backplane interface.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\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\u003eModel\u003c\/td\u003e\n\u003ctd\u003e1771-IAD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eUnited States\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e1.00 lbs \u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eBackplane current 195 mA at 5 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003e1771 Series \/ PLC-5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eDigital AC\/DC Input Modules\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Inputs\u003c\/td\u003e\n\u003ctd\u003e16 inputs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Type\u003c\/td\u003e\n\u003ctd\u003eDigital AC\/DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Voltage\u003c\/td\u003e\n\u003ctd\u003e79-138 VAC \/ 79-138 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage Category\u003c\/td\u003e\n\u003ctd\u003e120 VAC \/ 125 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency\u003c\/td\u003e\n\u003ctd\u003e50\/60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTypical AC Signal Delay Off\u003c\/td\u003e\n\u003ctd\u003e25 +\/- 5 ms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTypical DC Signal Delay Off\u003c\/td\u003e\n\u003ctd\u003e25 +\/- 5 ms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTypical AC Signal Delay On\u003c\/td\u003e\n\u003ctd\u003e5 +\/- 3 ms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTypical DC Signal Delay On\u003c\/td\u003e\n\u003ctd\u003e3 +\/- 0.1 ms or 10 +\/- 1 ms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum AC Off-State Current\u003c\/td\u003e\n\u003ctd\u003e2.8 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Chassis\u003c\/td\u003e\n\u003ctd\u003e1771-A1B, A2B, A3B, A3B1, A4B, 1771-AM1, 1771-AM2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eEtherNet\/IP and PLC Backplane Integration\u003c\/h3\u003e\n\u003cp\u003eThe 1771-IAD is designed for PLC-5 rack-based control architectures and communicates input status through the 1771 backplane. The module supports deterministic PLC I\/O scanning by transferring discrete field conditions into the controller data table.\u003c\/p\u003e\n\u003cp\u003eThe Allen-Bradley 1771 architecture provides modular I\/O density scaling through chassis-based expansion. Correct system operation requires compatibility between module type, rack slot configuration, and PLC-5 processor firmware requirements. The module uses the 1771 backplane electrical interface and does not provide independent network communication.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: How many field input points are available on the 1771-IAD module?\u003cbr\u003eA: The 1771-IAD provides 16 digital AC\/DC input channels for 120 VAC \/ 125 VDC class signals.\u003c\/p\u003e\n\u003cp\u003eQ: What is the backplane current requirement of the 1771-IAD?\u003cbr\u003eA: The module requires 195 mA from the 5 VDC backplane supply.\u003c\/p\u003e\n\u003cp\u003eQ: Can the 1771-IAD be installed in any PLC chassis?\u003cbr\u003eA: No. Installation requires a compatible Allen-Bradley 1771 series chassis with the correct backplane configuration.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInstall the 1771-IAD into the designated 1771 chassis slot with the module keying and connector alignment verified before insertion. Ensure the field wiring arm is correctly seated and terminal connections are tightened according to the installation documentation.\u003c\/p\u003e\n\u003cp\u003eSeparate AC\/DC field signal wiring from high-voltage power conductors where possible to reduce electrical noise coupling. Verify input voltage levels before connection and confirm grounding practices for the PLC enclosure and control panel.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43681213022298,"sku":"1771-IAD","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1771-IAD2.jpg?v=1784519647","url":"https:\/\/www.plcmasters.com\/products\/1771-iad-allen-bradley-digital-input-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}