{"product_id":"allen-bradley-1771-irc-rtd-analog-input-module","title":"Allen-Bradley 1771-IRC RTD Analog Input Module","description":"\u003ch2\u003eAllen-Bradley 1771-IRC RTD Analog Input Module\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1771-IRC\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1771-IRC\u003c\/strong\u003e RTD Analog Input Module, operates as a dedicated hardware component for resistance temperature signal acquisition within PLC-5 1771 I\/O chassis platforms. The module converts platinum RTD resistance signals into digital temperature values through isolated analog input processing.\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-IRC\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\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eRTD Analog Input Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem Platform\u003c\/td\u003e\n\u003ctd\u003ePLC-5 1771 I\/O chassis\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\u003e0.8 kg\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\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eApprox. 6 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSensor Type\u003c\/td\u003e\n\u003ctd\u003ePlatinum RTD, 100 Ohms, 0.00385 coefficient\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Configuration\u003c\/td\u003e\n\u003ctd\u003e16 single-ended channels or 8 differential channels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution\u003c\/td\u003e\n\u003ctd\u003e12-bit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccuracy\u003c\/td\u003e\n\u003ctd\u003e+\/- 0.1% of full scale\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConversion Time\u003c\/td\u003e\n\u003ctd\u003e2.5 ms per channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current\u003c\/td\u003e\n\u003ctd\u003e1.2 A at 5 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation\u003c\/td\u003e\n\u003ctd\u003eOptical isolation between field inputs and backplane\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWiring Arm\u003c\/td\u003e\n\u003ctd\u003e1771-WQ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Type\u003c\/td\u003e\n\u003ctd\u003eRack mounting\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley PLC-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 RTD Signal Processing and Firmware Compatibility\u003c\/h3\u003e\n\u003cp\u003eThe 1771-IRC provides RTD resistance measurement channels for PLC-5 control systems. The module performs analog-to-digital conversion of temperature sensor signals and transfers processed data through the PLC-5 backplane interface.\u003c\/p\u003e\n\u003cp\u003eThe module supports industrial control I\/O density scaling through multiple RTD input channels in a single 1771 rack slot. The isolated input architecture separates field sensor circuits from the controller backplane, reducing signal interference between measurement wiring and PLC communication paths.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What RTD sensor type is supported by the 1771-IRC module?\u003cbr\u003eA: The module supports platinum RTD sensors, including 100 Ohms RTDs with a 0.00385 temperature coefficient.\u003c\/p\u003e\n\u003cp\u003eQ: How many temperature measurement channels are available on the 1771-IRC?\u003cbr\u003eA: The module provides 16 single-ended RTD channels or 8 differential RTD channels depending on configuration.\u003c\/p\u003e\n\u003cp\u003eQ: What is the power requirement from the PLC-5 backplane?\u003cbr\u003eA: The 1771-IRC requires approximately 1.2 A from the 5 VDC backplane supply.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInstall the 1771-IRC module into a compatible 1771 I\/O chassis slot with the backplane power removed before insertion or removal. Connect RTD sensors through the specified 1771-WQ wiring arm and verify correct three-wire or differential wiring configuration.\u003c\/p\u003e\n\u003cp\u003eRoute RTD signal cables separately from high-voltage and switching circuits to minimize electrical noise coupling. Apply appropriate cable shielding and grounding practices according to the control panel installation standard.\u003c\/p\u003e\n\u003cp\u003eVerify sensor type selection, channel configuration, and wiring termination before system startup. Confirm that the module is fully seated in the rack and that field connections are mechanically secured.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43681496072282,"sku":"1771-IRC","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1771-IRC2.jpg?v=1784534402","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1771-irc-rtd-analog-input-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}