{"product_id":"allen-bradley-1771-ir-b-rtd-analog-input-module","title":"Allen-Bradley 1771-IR\/B RTD Analog Input Module","description":"\u003ch2\u003eAllen-Bradley 1771-IR\/B RTD Analog Input Module\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1771-IR\/B\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1771-IR\u003c\/strong\u003e RTD Analog Input Module, operates as a dedicated hardware component for resistance temperature signal acquisition within PLC-5 I\/O chassis platforms. The module converts three-wire RTD sensor inputs into digital temperature data for PLC processing, supporting platinum RTD measurement and isolated analog input operation.\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-IR\/B\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\u003e1.15 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\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\u003e100 Ohms platinum RTD, 10 Ohms copper\/other RTD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Configuration\u003c\/td\u003e\n\u003ctd\u003e6 three-wire RTD inputs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution\u003c\/td\u003e\n\u003ctd\u003e16 bits\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current\u003c\/td\u003e\n\u003ctd\u003e800 mA at 5 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Mounting\u003c\/td\u003e\n\u003ctd\u003eRack mounting\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\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\u003eRTD Measurement Range\u003c\/td\u003e\n\u003ctd\u003eUp to -200 to +850 deg C depending on RTD type\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConversion Method\u003c\/td\u003e\n\u003ctd\u003eRTD resistance to digital temperature conversion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eRTD Signal Processing and PLC-5 Integration\u003c\/h3\u003e\n\u003cp\u003eThe 1771-IR\/B provides six three-wire RTD input channels for direct connection to resistance temperature detectors. The module measures sensor resistance variation and transfers converted temperature data through the PLC-5 backplane interface. The three-wire RTD configuration compensates for lead resistance effects during temperature acquisition.\u003c\/p\u003e\n\u003cp\u003eThe Allen-Bradley PLC-5 architecture supports block transfer communication for analog module data exchange. The module uses isolated input circuitry to separate field sensor wiring from internal controller backplane signals.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What type of temperature sensors can be connected to the 1771-IR\/B module?\u003cbr\u003eA: The module accepts RTD sensors including 100 Ohms platinum RTDs and 10 Ohms copper or other compatible resistance temperature devices.\u003c\/p\u003e\n\u003cp\u003eQ: How many RTD inputs are available on the 1771-IR\/B?\u003cbr\u003eA: The module provides 6 three-wire RTD input channels for temperature signal measurement.\u003c\/p\u003e\n\u003cp\u003eQ: What is the backplane power requirement of the 1771-IR\/B?\u003cbr\u003eA: The module requires approximately 800 mA from the 5 VDC PLC-5 backplane supply.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInstall the 1771-IR\/B module in a compatible 1771 I\/O chassis slot with the backplane power removed during insertion or removal. Connect RTD field wiring through the specified 1771-WQ wiring arm and verify correct three-wire sensor termination.\u003c\/p\u003e\n\u003cp\u003eRoute RTD signal cables separately from high-current AC or switching circuits to reduce electrical interference. Use shielded instrumentation cable where required by the installation environment and terminate cable shields according to the control system grounding practice.\u003c\/p\u003e\n\u003cp\u003eVerify RTD sensor type, channel configuration, and wiring polarity before commissioning. Confirm that the module is securely seated in the rack and that all field connections are mechanically fixed.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43681494106202,"sku":"1771-IR\/B","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1771-IRB2.jpg?v=1784533836","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1771-ir-b-rtd-analog-input-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}