{"product_id":"1797-irt8-allen-bradley-flex-i-o-thermocouple-i-o-module","title":"1797-IRT8 Allen-Bradley FLEX I\/O Thermocouple I\/O Module","description":"\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen-Bradley 1797-IRT8\u003c\/strong\u003e, also cataloged as the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1797-IRT8\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThermocouple I\/O Module, operates as a dedicated hardware component for high-resolution temperature sensor data acquisition within FLEX I\/O networks. The module converts low-level analog signals from thermocouples and resistance temperature detectors (RTDs) into linearized temperature values for processing across the control architecture.\u003c\/p\u003e\n\u003ch3\u003eFunctional Architectural Coding\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e1797: Bulletin identifier for intrinsically safe distributed I\/O hardware (FLEX Ex).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eIRT: Designator for combined resistance temperature detector and thermocouple input instrumentation circuits.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e8: Physical density value denoting eight independent analog hardware input channels.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eModel\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1797-IRT8\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eBrand\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eAllen-Bradley\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eOrigin\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eUSA\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eModule Type\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eThermocouple \/ RTD Input Module\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eNumber of Inputs\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e8 channels\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eSignal Input Range\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0 to 500 ohms ; -40 to 100 mV\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eSettling Time to 99%\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e8 ms\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eOpen RTD Detection\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eOut of range upscale reading\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eLead Resistance Compensation\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eLess than 15 ohm total\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eModule Field-Side Power Consumption\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1.6 W\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003ePower Dissipation\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1.6 W\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eThermal Dissipation Maximum\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e5.46 BTU\/hr\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eKeyswitch Position\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eOperating Temp\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e-20 to +70 deg C\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eStorage Temp\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e-40 to +85 deg C\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eRelative Humidity\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e5 to 95% noncondensing\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eIngress Protection\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eIP20\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eTariff Code\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e8537101190\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eShipping Dimensions\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e13.0 cm x 13.0 cm x 8.7 cm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eWeight\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.2 kg\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eDeterministic Subsystem Configuration \u0026amp; Backplane Alignment\u003c\/h3\u003e\n\u003cp\u003eThe processing architecture mounts onto compatible terminal base units, interfacing with field instrumentation via internal bus configurable pathways. Through network adapters, data frames flow over Profinet \/ EtherNet\/IP deterministic networks without consuming unauthorized backplane bus communication velocity licenses. The internal logic maintains rigid firmware flash compatibility parameters during dynamic I\/O density scaling events, protecting digital register updates from latency fluctuations.\u003c\/p\u003e\n\u003ch3\u003eLogistics Package Contents\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e1 Allen-Bradley 1797-IRT8 Thermocouple\/RTD Input Module\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e1 Factory Calibration Certificate Sheet\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eField Connection and Grounding Guidelines\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003eMechanical Interlock Setting\u003c\/p\u003e\n\u003cp\u003eRotate the terminal base keyswitch to position 2 prior to alignment. Press the module firmly onto the base until the side latches engage completely.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eInstrument Shielding Protocols\u003c\/p\u003e\n\u003cp\u003eTerminate all instrument cable braided shields at a single external grounding bar. Run thermocouple conductors inside dedicated conduits to avoid electromagnetic noise interference.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCompensation Wire Rules\u003c\/p\u003e\n\u003cp\u003eUse matching thermocouple extension wire types for all sensor links. Ensure total lead resistance remains under 15 ohms to preserve calibration parameters.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003eWhat are the specific hardware restrictions regarding hot-swapping the module on an active base?\u003c\/p\u003e\n\u003cp\u003eHot-swapping is permitted in non-hazardous locations, but the base parameters must remain stable to prevent bus communication disruptions.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHow does the internal logic handle a broken wire or disconnected sensor terminal path?\u003c\/p\u003e\n\u003cp\u003eThe module triggers an open RTD detection sequence, forcing the data register to an out-of-range upscale reading value.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCan channel 0 process an RTD loop while channel 1 simultaneously acquires a thermocouple input?\u003c\/p\u003e\n\u003cp\u003eYes, the internal bus configurable architecture allows individual channel profiles to be parameterized independently for voltage or resistance modes.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat is the settling time required for the input filter to reach 99% of a final step-change value?\u003c\/p\u003e\n\u003cp\u003eThe analog-to-digital converter circuitry finishes stabilization and updates the data register within a target period of 8 ms.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDoes this module draw its operational current from the terminal base backplane bus?\u003c\/p\u003e\n\u003cp\u003eThe module limits its field-side power consumption to 1.6 W, derived directly through the base connections from the barrier power source.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat physical function does the keyswitch position 2 perform on the terminal base unit?\u003c\/p\u003e\n\u003cp\u003eIt acts as a mechanical alignment guard, preventing the installation of high-voltage modules into low-voltage analog base configurations.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHow are communication velocity licenses adjusted when adding modules to the cluster?\u003c\/p\u003e\n\u003cp\u003eThe module utilizes standard configuration files and requires no separate backplane bus communication velocity licenses to interface with adapters.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDoes the hardware track internal cold junction compensation drift autonomously?\u003c\/p\u003e\n\u003cp\u003eThe internal circuit architecture samples local references to offset thermocouple junctions, adjusting calculations against environmental thermal variances.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":46066460033197,"sku":"1797-IRT8","price":159.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/1613\/9181\/files\/1797-IRT8_34.jpg?v=1784022861","url":"https:\/\/www.maxwellplc.com\/products\/1797-irt8-allen-bradley-flex-i-o-thermocouple-i-o-module","provider":"Maxwell PLC Ltd","version":"1.0","type":"link"}