{"product_id":"allen-bradley-1771-igd-a-digital-dc-input-module","title":"Allen-Bradley 1771-IGD\/A Digital DC Input Module","description":"\u003ch2\u003eAllen-Bradley 1771-IGD\/A Digital DC Input Module\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1771-IGD\/A\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1771-IGD\u003c\/strong\u003e Digital DC Input Module, operates as a dedicated hardware component for discrete signal acquisition within PLC-5 I\/O chassis platforms. It provides 16 point DC input monitoring with optoelectrical isolation, selectable input filtering, and channel status indication for field device 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-IGD\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley (Rockwell Automation)\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\u003eModule Type\u003c\/td\u003e\n\u003ctd\u003eDigital DC Input Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Family\u003c\/td\u003e\n\u003ctd\u003ePLC-5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Configuration\u003c\/td\u003e\n\u003ctd\u003e16 point sinking DC inputs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Voltage Range\u003c\/td\u003e\n\u003ctd\u003e10-60 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLogic Input Type\u003c\/td\u003e\n\u003ctd\u003eDigital DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Current\u003c\/td\u003e\n\u003ctd\u003eApproximately 10 mA per channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOff-State Current\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;=2 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResponse Time\u003c\/td\u003e\n\u003ctd\u003eSelectable 1 ms or 6 ms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation\u003c\/td\u003e\n\u003ctd\u003eOptoelectrical isolation with input filtering\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current\u003c\/td\u003e\n\u003ctd\u003e130 mA @ 5 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e6 W\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\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e237.5 x 183 x 55 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 to 60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage Temp\u003c\/td\u003e\n\u003ctd\u003e-40 to 85 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWiring Arm\u003c\/td\u003e\n\u003ctd\u003e1771-WH\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Style\u003c\/td\u003e\n\u003ctd\u003eRack mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003ePLC-5 processors and 1771 I\/O chassis\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003ePLC-5 Digital Input Signal Processing\u003c\/h3\u003e\n\u003cp\u003eThe 1771-IGD\/A module processes discrete DC field signals through 16 input channels connected to the PLC-5 backplane system. The input circuitry supports selectable delay filtering to control response behavior during signal transitions. LED indicators provide individual channel state feedback for input verification and troubleshooting.\u003c\/p\u003e\n\u003cp\u003eThe Allen-Bradley PLC-5 architecture uses rack-based I\/O communication with block transfer and backplane data exchange mechanisms. The module design supports I\/O density scaling within 1771 chassis configurations while maintaining isolated field-side signal handling.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What type of field signals can the 1771-IGD\/A accept?\u003cbr\u003eA: The module accepts discrete DC input signals within the specified input voltage range. It is configured for connection to switches, sensors, and other digital field devices.\u003c\/p\u003e\n\u003cp\u003eQ: Does the 1771-IGD\/A provide electrical isolation between field inputs and the PLC backplane?\u003cbr\u003eA: Yes. The module uses optoelectrical isolation between field input circuits and the PLC-5 backplane interface.\u003c\/p\u003e\n\u003cp\u003eQ: What wiring arm is compatible with the 1771-IGD\/A module?\u003cbr\u003eA: The compatible wiring arm is the 1771-WH terminal assembly.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInstall the 1771-IGD\/A module in a compatible 1771 I\/O chassis slot and verify rack power removal before module insertion or removal. Connect field wiring through the specified wiring arm while maintaining separation between input signal conductors and high-voltage switching cables.\u003c\/p\u003e\n\u003cp\u003eUse proper grounding practices for the chassis and cable shields where applicable. Route DC input wiring to minimize exposure to electromagnetic interference sources such as motor feeders and contactor circuits. Confirm input polarity, voltage level, and terminal assignments before applying field power.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43681337311322,"sku":"1771-IGD\/A","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1771-IGDA2.jpg?v=1784531064","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1771-igd-a-digital-dc-input-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}