{"product_id":"allen-bradley-1771-ir-plc-5-rtd-input-module-3-wire-resistance-temperature-detector","title":"Allen-Bradley 1771-IR PLC-5 RTD Input Module | 3-Wire Resistance Temperature Detector","description":"\u003ch3\u003e\u003cstrong\u003eFunctional Capabilities\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1771-IR\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(Part Number:\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1771-IR\u003c\/strong\u003e) is a high-precision analog input module designed for the Rockwell Automation PLC-5 platform. It provides a specialized interface for Resistance Temperature Detectors (RTDs), converting low-level resistance signals into temperature data that is directly usable by the processor. This module supports up to six 3-wire RTD sensors, utilizing an internal circuit to compensate for lead-wire resistance, which ensures high accuracy even in distributed installations where sensors are located far from the control cabinet.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDetailed Technical Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1771-IR\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis engineered for industrial-grade thermal monitoring with the following hardware parameters:\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eInput Configuration\u003c\/strong\u003e: 6 Three-Wire RTD Inputs\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSensor Compatibility\u003c\/strong\u003e: 100-Ohm Platinum (385\/3916), 10-Ohm Copper, 120-Ohm Nickel, and 604-Ohm Nickel-Iron\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eData Resolution\u003c\/strong\u003e: 16 bits plus sign (1.0° Celsius or 1.0° Fahrenheit per bit)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSampling Rate\u003c\/strong\u003e: 50 ms for an 8-channel update cycle (effective for all 6 active inputs)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eBackplane Current Load\u003c\/strong\u003e: 800 mA at 5V DC\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003ePower Requirement\u003c\/strong\u003e: Powered entirely via the 1771 backplane; no external power source required\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eData Formatting Options\u003c\/strong\u003e: Natural Binary, BCD (Actual Temperature), or Ohms (Resistance reading)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSignal Propagation Delay\u003c\/strong\u003e: 10 ms (DC On); 50 ms (DC Off); 45ms ± 15ms (AC Off)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003ePhysical Mounting\u003c\/strong\u003e: In-chassis, standard 1771 Universal I\/O slot\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWiring Termination\u003c\/strong\u003e: Requires\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1771-WH\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eWiring Arm for field connections\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.45 kg (1.00 lbs)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eOperational and Environmental Limits\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eDesigned for continuous duty in harsh automation environments, the module adheres to the following tolerances:\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eOperating Temperature\u003c\/strong\u003e: 0°C to 60°C (32°F to 140°F)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eStorage Temperature\u003c\/strong\u003e: -40°C to 85°C (-40°F to 185°F)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHumidity Control\u003c\/strong\u003e: 5% to 95% relative humidity (non-condensing)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eIsolation\u003c\/strong\u003e: Opto-electrical isolation between the backplane and field-side circuitry to protect the controller from transients\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eIntegration FAQ\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eHow does the module handle different RTD types?\u003c\/strong\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1771-IR\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis versatile. While optimized for 100-Ohm Platinum sensors, it can be configured via the PLC-5 output image table to read 10-Ohm or other supported resistance ranges. Users must select the correct sensor type during configuration to ensure the linear conversion from resistance to temperature is accurate.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the benefit of the 3-wire connection supported by this module?\u003c\/strong\u003eStandard 2-wire RTDs often suffer from inaccuracies caused by the resistance of the lead wires. The\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1771-IR\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eutilizes a 3-wire configuration to measure and subtract the lead-wire resistance, providing a more stable and accurate temperature reading in industrial environments.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I read raw resistance instead of temperature?\u003c\/strong\u003eYes. By configuring the data format to \"Ohm Readings,\" the module will bypass the temperature linearization and report the actual resistance value in the data table.\u003c\/p\u003e","brand":"Allen Bradley","offers":[{"title":"Default Title","offer_id":52887620190392,"sku":"1771-IR","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0935\/6132\/3704\/files\/1771-IR.jpg?v=1772096101","url":"https:\/\/www.globalpetroparts.com\/products\/allen-bradley-1771-ir-plc-5-rtd-input-module-3-wire-resistance-temperature-detector","provider":"Global Petro Parts Automation","version":"1.0","type":"link"}