{"product_id":"allen-bradley-1794-it8-a-flex-i-o-thermocouple-input-module","title":"Allen-Bradley 1794-IT8\/A FLEX I\/O Thermocouple Input Module","description":"\u003ch2\u003eAllen-Bradley 1794-IT8\/A FLEX I\/O Thermocouple Input Module\u003c\/h2\u003e\n\u003cp\u003eConfigured for thermocouple and millivolt signal acquisition in FLEX I\/O platforms, the \u003cstrong\u003eAllen-Bradley 1794-IT8\/A\u003c\/strong\u003e (\u003cstrong\u003e1794-IT8\u003c\/strong\u003e FLEX I\/O Thermocouple Input Module) provides direct physical\/electrical execution. The module processes 8 differential thermocouple or mV input channels with onboard cold-junction compensation and configurable sensor input ranges.\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\u003e1794-IT8\/A\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\u003eThermocouple Input Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Inputs\u003c\/td\u003e\n\u003ctd\u003e8 differential input channels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Signal Types\u003c\/td\u003e\n\u003ctd\u003eThermocouple types B, C, E, J, K, N, R, S, T; mV signals\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMillivolt Input Ranges\u003c\/td\u003e\n\u003ctd\u003e+\/-30 mV, +\/-78 mV\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\u003eConversion Type\u003c\/td\u003e\n\u003ctd\u003eSigma-Delta conversion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eData Format\u003c\/td\u003e\n\u003ctd\u003e16-bit 2's complement integer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccuracy\u003c\/td\u003e\n\u003ctd\u003eThermocouple dependent, typically +\/-0.05% to +\/-0.1% of full scale\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCold Junction Compensation\u003c\/td\u003e\n\u003ctd\u003eAutomatic via external CJC sensors such as 1794-CJC2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation Voltage\u003c\/td\u003e\n\u003ctd\u003e50 V continuous, basic insulation type, channel-to-system\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFLEXbus Current\u003c\/td\u003e\n\u003ctd\u003e20 mA @ 5 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExternal DC Power Supply\u003c\/td\u003e\n\u003ctd\u003e24 V DC nominal, 10.5 to 31.2 V DC range\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e3.0 W maximum @ 31.2 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThermal Dissipation\u003c\/td\u003e\n\u003ctd\u003e10.2 BTU\/hr maximum @ 31.2 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTerminal Base Units\u003c\/td\u003e\n\u003ctd\u003e1794-TB3T, 1794-TB3TS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eFLEX I\/O Platform I\/O Density Scaling and Communication Interface\u003c\/h3\u003e\n\u003cp\u003eThe 1794-IT8\/A is designed for FLEX I\/O system integration where multiple field signal modules share a common I\/O architecture. The module performs local analog signal conversion and transfers processed data through the FLEXbus backplane interface. Channel configuration allows individual thermocouple type selection and millivolt range assignment without external signal conditioning hardware. The architecture supports I\/O density scaling by adding compatible FLEX I\/O modules within the same node structure.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions (FAQ)\u003c\/h3\u003e\n\u003cp\u003eQ: Can the 1794-IT8\/A accept different thermocouple types on separate channels?\u003cbr\u003eA: Yes. Each input channel can be individually configured for supported thermocouple types or millivolt ranges.\u003c\/p\u003e\n\u003cp\u003eQ: Does the module provide channel-to-channel isolation?\u003cbr\u003eA: No. The module uses differential inputs with non-isolated channel-to-channel configuration. Isolation is specified as channel-to-system basic insulation.\u003c\/p\u003e\n\u003cp\u003eQ: What external components are required for cold-junction compensation?\u003cbr\u003eA: Cold-junction compensation requires compatible external CJC sensors such as the 1794-CJC2 when used with thermocouple inputs.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInstall the module on compatible FLEX I\/O terminal bases including 1794-TB3T or 1794-TB3TS models. Verify terminal base wiring before applying field power.\u003c\/p\u003e\n\u003cp\u003eUse shielded thermocouple wiring where required by the installation environment. Connect cable shields according to site grounding practices and avoid routing low-level thermocouple signals parallel to high-current power conductors.\u003c\/p\u003e\n\u003cp\u003eMaintain separation between analog input wiring and sources of electrical noise such as motor feeders, contactors, and variable frequency drive output cables. Confirm thermocouple polarity, sensor type configuration, and CJC wiring before commissioning.\u003c\/p\u003e\n\u003cp\u003eVerify the 24 V DC supply range and FLEXbus connection before module operation. Follow the applicable FLEX I\/O installation manual for grounding, mounting, and replacement procedures.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43778453274714,"sku":"1794-IT8\/A","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1794-IT82.jpg?v=1778230163","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1794-it8-a-flex-i-o-thermocouple-input-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}