{"product_id":"1794-ir8-allen-bradley-flex-i-o-rtd-input-module","title":"1794-IR8 | Allen-Bradley | FLEX I\/O RTD Input Module","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen-Bradley 1794-IR8\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eserves as a high-density temperature acquisition module within the FLEX I\/O platform. This module interfaces with up to eight Resistance Temperature Detectors (RTDs) or direct resistance sensors, converting low-level signals into precise digital data for the controller. We supply this unit as\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100% Brand New and Original\u003c\/strong\u003e, ensuring your distributed I\/O system maintains lab-grade thermal monitoring accuracy in rugged industrial environments.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eFeature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eNumber of Inputs\u003c\/strong\u003e\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\u003e\u003cstrong\u003eInput Range\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1 to 433 Ohms\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eResolution\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e16 bits across 435 Ohms\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eExcitation Current\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e718.36 \u003cspan class=\"math-inline\"\u003e$\\mu$\u003c\/span\u003eA\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eAccuracy (Enhanced Mode)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.01% full scale (typical)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eIsolation Voltage\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e850V DC for 1s (Inputs\/Power to Logic)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eData Format\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e16-bit 2’s complement or offset binary\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eChannel Bandwidth\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0 to 2.62 Hz (-3db)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eFlexbus Current\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e20 mA\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eThermal Dissipation\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e10.2 BTU\/hr @ 31.2V DC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eEngineering Advantages\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHigh-Density Thermal Mapping:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe 1794-IR8 packs eight channels into a compact FLEX I\/O footprint. This high density allows for comprehensive temperature monitoring across large equipment or reactor vessels without significantly expanding the control cabinet size.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003ePrecision Signal Conversion:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe 16-bit resolution delivers exceptional sensitivity for critical thermal processes. In Enhanced Mode, the module achieves a typical accuracy of 0.01% of full scale, enabling the control system to detect minute temperature shifts and adjust PID loops with surgical precision.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eRobust Electrical Isolation:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eTested at 850V DC, the module provides a secure barrier between field-side inputs and the logic circuitry. This isolation protects the Flexbus and the primary controller from ground loops and high-voltage transients that often occur in heavy industrial power environments.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eVersatile Terminal Integration:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe module docks directly onto various FLEX I\/O terminal bases, including the 1794-TB2, -TB3, and -TB3T. This modularity allows technicians to replace the electronic component without disturbing the field wiring, dramatically reducing downtime during maintenance cycles.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eAdvanced Noise Filtering:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eA low channel bandwidth (0-2.62Hz) effectively filters out high-frequency electromagnetic interference (EMI) commonly generated by motors and variable frequency drives (VFDs). This ensures stable, jitter-free temperature readings for the DCS or PLC.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQs\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWhich RTD types does the 1794-IR8 support?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe module supports a wide range of industry-standard RTDs, including 100$\\Omega$ Platinum (385 and 392 curves), 200$\\Omega$ Platinum, 10$\\Omega$ Copper, and 120$\\Omega$ Nickel. You can configure each channel independently via the software to match your specific sensor type.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this module require a separate power supply?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes, the 1794-IR8 requires 24V DC user power to operate the analog circuitry. Ensure your power supply maintains stability, as the module consumes up to 3.0W at 31.2V DC.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use 2-wire, 3-wire, or 4-wire RTDs?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 1794-IR8 supports 2-wire and 3-wire RTD configurations. For high-precision applications, we recommend 3-wire wiring to compensate for lead-wire resistance, ensuring the module measures the sensor's actual resistance rather than the cable's.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHow does the \"Enhanced Mode\" affect performance?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eEnhanced Mode increases the accuracy and repeatability of the conversion at the cost of a slightly longer update time. Use this mode for slow-moving thermal processes where precision is more critical than instantaneous response speed.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen Bradley","offers":[{"title":"Default Title","offer_id":53382586106040,"sku":"1794-IR8","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0935\/6132\/3704\/files\/1794-IR8.jpg?v=1776930805","url":"https:\/\/www.globalpetroparts.com\/products\/1794-ir8-allen-bradley-flex-i-o-rtd-input-module","provider":"Global Petro Parts Automation","version":"1.0","type":"link"}