{"product_id":"allen-bradley-1746-nr8-slc-500-rtd-input-module-8-channel","title":"Allen-Bradley 1746-NR8 SLC 500 RTD Input Module | 8-Channel","description":"\u003ch2\u003e\u003cstrong\u003eAllen-Bradley 1746-NR8 RTD\/Resistance Input Module\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e \u003cspan style=\"color: #e74c3c;\"\u003eAllen-Bradley\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e SLC 500 programmable controller family\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel Number:\u003c\/strong\u003e \u003cspan style=\"color: #e74c3c;\"\u003e\u003cstrong\u003e1746-NR8\u003c\/strong\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModule Type:\u003c\/strong\u003e \u003cspan style=\"color: #e74c3c;\"\u003e8-channel RTD\/Resistance analog input\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Channels:\u003c\/strong\u003e Eight isolated RTD\/resistance inputs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Resolution:\u003c\/strong\u003e \u003cspan style=\"color: #e74c3c;\"\u003e0.01° Celsius\u003c\/span\u003e precision\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA\/D Conversion:\u003c\/strong\u003e Sigma-delta modulation technology\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Performance Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eThe \u003cstrong\u003e1746-NR8\u003c\/strong\u003e provides \u003cspan style=\"color: #e74c3c;\"\u003eeight independent measurement channels\u003c\/span\u003e in one module\u003c\/li\u003e\n\u003cli\u003eUpdate time is configurable from 6 milliseconds to 2 seconds per channel\u003c\/li\u003e\n\u003cli\u003eIt supports multiple RTD types including Platinum, Copper, Nickel, and Nickel Iron\u003c\/li\u003e\n\u003cli\u003eBuilt-in programmable low-pass digital filtering reduces signal noise\u003c\/li\u003e\n\u003cli\u003eAuto-calibration occurs at power-up and can cycle every 5 minutes\u003c\/li\u003e\n\u003cli\u003eStep response time is 60 milliseconds in, 2.5 milliseconds out\u003c\/li\u003e\n\u003cli\u003eNine status LEDs indicate module operation and individual channel status\u003c\/li\u003e\n\u003cli\u003eBroken sensor detection identifies open or short circuit conditions automatically\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eSensor Compatibility and Wiring Options\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupported RTD Types:\u003c\/strong\u003e Platinum (385\/3916), Copper (426), Nickel (618\/672), Nickel Iron (518)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWiring Configurations:\u003c\/strong\u003e Supports \u003cspan style=\"color: #e74c3c;\"\u003e2-wire, 3-wire, and 4-wire RTD connections\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect Resistance Inputs:\u003c\/strong\u003e 0-150Ω, 0-300Ω, 0-500Ω, 0-1000Ω ranges available\u003c\/li\u003e\n\u003cli\u003eRecommended cable: Belden 9501 for 2-wire, Belden 9533\/83503 for 3\/4-wire RTDs\u003c\/li\u003e\n\u003cli\u003eUse lower gauge cables (like AWG #16) for long wire runs to maintain accuracy\u003c\/li\u003e\n\u003cli\u003eEach Removable Terminal Block (RTB) terminal accepts single wire connections only\u003c\/li\u003e\n\u003cli\u003eCompatible with Allen-Bradley 1746-RT-35 terminal block for field wiring\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eElectrical and Isolation Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBackplane current: \u003cspan style=\"color: #e74c3c;\"\u003e100 mA at 5V DC and 55 mA at 24V DC\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003eMaximum power consumption: 1.82 watts total (0.5W at 5V DC, 1.32W at 24V DC)\u003c\/li\u003e\n\u003cli\u003eIsolation: \u003cspan style=\"color: #e74c3c;\"\u003e500V AC for 1 minute\u003c\/span\u003e between inputs and backplane\/chassis ground\u003c\/li\u003e\n\u003cli\u003eContinuous isolation: 5V DC between individual measurement channels\u003c\/li\u003e\n\u003cli\u003eMaximum common-mode voltage tolerance: ±1 volt\u003c\/li\u003e\n\u003cli\u003eMaximum permanent overload protection: ±5V DC or ±5 mA\u003c\/li\u003e\n\u003cli\u003eNo external power supply required - powered entirely from backplane\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eEnvironmental and Installation Details\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOperating temperature: \u003cspan style=\"color: #e74c3c;\"\u003e0°C to 60°C (32°F to 140°F)\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003eStorage temperature: -40°C to 85°C (-40°F to 185°F)\u003c\/li\u003e\n\u003cli\u003eRelative humidity: 5% to 95% non-condensing\u003c\/li\u003e\n\u003cli\u003eInstall in any 1746 chassis slot \u003cspan style=\"color: #e74c3c;\"\u003eexcept slot 0\u003c\/span\u003e (reserved for processor)\u003c\/li\u003e\n\u003cli\u003eCompatible with both fixed style and modular style SLC 500 hardware\u003c\/li\u003e\n\u003cli\u003eSingle-slot design maximizes channel density in control panels\u003c\/li\u003e\n\u003cli\u003eIdeal for temperature monitoring and mechanical position sensing applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\n\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003cstrong\u003e\u003c\/strong\u003e\n\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat is the measurement resolution for temperature readings?\u003c\/strong\u003e\u003cbr\u003eThis module provides high precision with 0.01° Celsius resolution for accurate temperature monitoring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCan I measure resistance values directly?\u003c\/strong\u003e\u003cbr\u003eYes, the module accepts direct resistance inputs from 0-150Ω to 0-1000Ω for various applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhere should I install this module in the chassis?\u003c\/strong\u003e\u003cbr\u003eInstall the \u003cstrong\u003e1746-NR8\u003c\/strong\u003e in any slot of a 1746 chassis except slot 0, which is processor-only.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDoes the module require separate power wiring?\u003c\/strong\u003e\u003cbr\u003eNo external power is needed - the module receives power directly from the SLC 500 backplane.\u003cstrong\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":45570869231777,"sku":"1746-NR8","price":218.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0673\/5390\/3265\/files\/1746-NR8.jpg?v=1766566378","url":"https:\/\/www.autonexcontrol.com\/uk\/products\/allen-bradley-1746-nr8-slc-500-rtd-input-module-8-channel","provider":"AutoNex Controls Limited ","version":"1.0","type":"link"}