{"product_id":"allen-bradley-1746-int4-slc-500-isolated-thermocouple-mv-analog-input-module","title":"Allen-Bradley 1746-INT4 SLC 500 Isolated Thermocouple\/mV Analog Input Module","description":"\u003ch1\u003eAllen-Bradley 1746-INT4 SLC 500 Isolated Thermocouple\/mV Analog Input Module\u003c\/h1\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen-Bradley 1746-INT4\u003c\/strong\u003e, also cataloged as the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1746-INT4\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eisolated thermocouple\/mV analog input module, serves as the primary 4-channel temperature and millivolt acquisition interface utilized to execute thermocouple signal conversion across SLC 500 backplane I\/O platforms.\u003c\/p\u003e\n\u003cp\u003eConfigured for isolated analog signal acquisition in SLC 500 scan cycles, the module converts thermocouple and ±100 mV DC inputs into 16-bit digital process values through internal linearization and cold junction compensation processing. Input channels are galvanically isolated to reduce channel interaction during high-density temperature measurement.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cp\u003eNo structured suffix or option coding is defined for 1746-INT4. The part number represents a fixed SLC 500 catalog identifier without configurable hardware variants.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003ctable class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003cth class=\"last:pe-10\"\u003eParameter\u003c\/th\u003e\n\u003cth class=\"last:pe-10\"\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\u003e1746-INT4\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\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e1.00 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 to 70 deg C (CJC range)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e110 mA @ 5 VDC \/ 85 mA @ 24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Channels\u003c\/td\u003e\n\u003ctd\u003e4 (Isolated)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Types\u003c\/td\u003e\n\u003ctd\u003eThermocouple \/ mV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupported Thermocouples\u003c\/td\u003e\n\u003ctd\u003eType C, D, J, K, T, E, R, S, B, N\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003emV Input Range\u003c\/td\u003e\n\u003ctd\u003e-100 to 100 mV DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBandwidth\u003c\/td\u003e\n\u003ctd\u003e8 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution\u003c\/td\u003e\n\u003ctd\u003e16 bit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUpdate Time\u003c\/td\u003e\n\u003ctd\u003e500 ms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStep Response\u003c\/td\u003e\n\u003ctd\u003e100 ms ON \/ 2.5 ms OFF\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCold Junction Compensation\u003c\/td\u003e\n\u003ctd\u003e±1.5 deg C accuracy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOpen Circuit Detection Time\u003c\/td\u003e\n\u003ctd\u003e5 s typical\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLinearization Standards\u003c\/td\u003e\n\u003ctd\u003eIPTS-68, NBS MN-125, MN-161\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eI\/O Connection\u003c\/td\u003e\n\u003ctd\u003e1746 backplane system\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eBackplane Communication and Channel Isolation Behavior\u003c\/h3\u003e\n\u003cp\u003eThe module exchanges digitized temperature and mV values through the SLC 500 backplane during cyclic scan execution. Each channel is independently isolated to reduce cross-channel coupling during simultaneous thermocouple acquisition. Backplane load is distributed across 5 VDC and 24 VDC rails with fixed current draw independent of signal activity.\u003c\/p\u003e\n\u003ch3\u003eCold Junction Compensation and Thermocouple Linearization Processing\u003c\/h3\u003e\n\u003cp\u003eTemperature conversion is performed using embedded IPTS-68 and NBS standard linearization tables. Cold junction compensation is applied at the terminal interface with ±1.5 deg C accuracy across 0 to 70 deg C reference conditions. Open-circuit detection logic supports upscale, downscale, or zero configuration with a typical detection time of 5 s.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions (FAQ)\u003c\/h3\u003e\n\u003cp\u003eQ: Can the 1746-INT4 be hot-swapped in an energized SLC 500 rack?\u003cbr\u003eA: No. Backplane power must be removed before insertion or removal to prevent analog channel offset corruption.\u003c\/p\u003e\n\u003cp\u003eQ: Does each channel operate independently in isolation mode?\u003cbr\u003eA: Yes. Each of the 4 inputs is galvanically isolated to reduce channel-to-channel electrical interaction during thermocouple measurement.\u003c\/p\u003e\n\u003cp\u003eQ: What happens if a thermocouple wire breaks?\u003cbr\u003eA: Open-circuit detection triggers upscale, downscale, or zero output depending on configuration, with a typical detection delay of 5 s.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eThe module shall be installed in a compatible SLC 500 chassis slot with proper backplane alignment and secure seating of the terminal assembly prior to energization.\u003c\/p\u003e\n\u003cp\u003eThermocouple extension wires must follow correct polarity and be routed separately from high-voltage conductors to prevent induced thermal EMF distortion. Shielding shall be grounded at a single reference point to avoid ground loop formation. Cold junction reference area must remain within the specified environmental range to maintain compensation accuracy.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43505055334490,"sku":"1746-INT4","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1746-INT42.jpg?v=1781592876","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1746-int4-slc-500-isolated-thermocouple-mv-analog-input-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}