{"product_id":"allen-bradley-1794-ir8-flex-i-o-8-channel-rtd-input-module","title":"Allen-Bradley 1794-IR8 Flex I\/O 8-Channel RTD Input Module","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong style=\"color: #0056b3;\"\u003e1794-IR8\u003c\/strong\u003e is an authentic, high-precision Resistance Temperature Detector (RTD) Input Module from Allen-Bradley’s trusted \u003cstrong\u003eFlex I\/O\u003c\/strong\u003e distributed hardware line. Actively converting low-amplitude resistance variations into digitized data arrays, this module features 8 independent input channels designed to interface with various Platinum, Nickel, and Copper RTD sensors. Engineered with a compact, ultra-lightweight industrial chassis weighing approximately \u003cstrong\u003e0.2 lbs (approx. 90 grams)\u003c\/strong\u003e, this modular DIN-rail component allows industrial teams to mount localized I\/O nodes close to processing machinery, lowering wiring runs while maintaining excellent noise rejection without adding substantial structural load to the control panel.\u003c\/p\u003e\n\n\u003ch3\u003eCore Technical Advantages\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh-Resolution Digital Conversion:\u003c\/strong\u003e Utilizes a 16-bit analog-to-digital converter spanning a nominal resistance scale of 1 to 433 Ohms, ensuring exceptional precision for tracking minute temperature shifts.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDual Performance Optimization Layouts:\u003c\/strong\u003e Supports standard \"Normal Mode\" execution offering a full-scale accuracy of ±0.05%, or a software-selectable \"Enhanced Mode\" that tightens operational tolerances to a typical variance of ±0.01%.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBroad Sensor Interfacing Capability:\u003c\/strong\u003e Programmatically matches multiple industrial sensor profiles including standard 100, 200, and 500 Ohm Platinum curves (Euro\/U.S. coefficients), high-sensitivity Nickel variants, and 10 Ohm Copper sensors.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse;\"\u003e\n  \u003cthead\u003e\n    \u003ctr style=\"background-color: #f2f2f2;\"\u003e\n      \u003cth style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\"\u003eParameter Attribute\u003c\/th\u003e\n      \u003cth style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\"\u003eFactory Specification Data\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e\u003cstrong\u003eBrand \/ Manufacturer\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eAllen-Bradley \/ Rockwell Automation\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e\u003cstrong\u003eProduct Model \/ SKU\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e1794-IR8\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e\u003cstrong\u003eProduct Series\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eFlex I\/O Platform\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e\u003cstrong\u003eTotal Active Inputs\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e8 Independent RTD Channels\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e\u003cstrong\u003eNominal Resistance Bounds\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e1 to 433 Ohms (Max resolution capability at 435 Ohms)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e\u003cstrong\u003eConstant Excitation Current\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e718.36 µA\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e\u003cstrong\u003eNoise Filtering Capacity\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e-60 dB attenuation baseline at 60 Hz (Normal Mode)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e\u003cstrong\u003eMax Power \/ Thermal Burden\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e31.2V DC Max Input | 3W Power Dissipation | 10.2 BTU\/hr Heat\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e\u003cstrong\u003eFlexbus Current Draw\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e20 mA maximum consumption\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e\u003cstrong\u003eGalvanic Isolation Barrier\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e850 Volts DC sustained isolation rating\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e\u003cstrong\u003eNet Module Weight\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eApprox. 0.2 lbs (0.09 kg) (Excluding terminal base assembly)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e\u003cstrong\u003eMechanical Installation\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e35mm DIN Rail Mount | Vibration rating: 5g @ 10 to 500 Hz\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e\u003cstrong\u003eOperating Ambient Range\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e0 to 55°C (32 to 131°F) | Storage: -40 to 85°C\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eInstallation \u0026amp; Field Wiring Guide\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTerminal Base Compatibility \u0026amp; Mounting:\u003c\/strong\u003e The 1794-IR8 module snaps directly into designated Flex I\/O terminal base assemblies (such as the 1794-TB3 or 1794-TB3S). Because the module itself features a light, compact body weight of only 0.2 lbs, multiple units can be safely stacked on standard 35mm DIN rails without risking mechanical sag or strain on the enclosure backplate.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSystem Throughput Expectations:\u003c\/strong\u003e In Normal Mode, scanning a single active channel takes 325 ms, while running all 8 channels requires 2.6 seconds. If your code selects Enhanced Mode, the default scan interval scales up to 2.925 seconds for all 8 paths. Ensure your control logic loop timers account for these conversion windows.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShield Termination Best Practices:\u003c\/strong\u003e To protect low-level signal paths against high-frequency electromagnetic interference, use twisted-pair shielded field cables. Connect the cable shield layers to the designated ground terminals on the Flex I\/O base assembly, ensuring they are grounded at one end only.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eEngineering Reliability Matrix\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGalvanic Loop Protection:\u003c\/strong\u003e Features a robust 850V DC isolation barrier that separates field-side sensor loops from internal Flexbus logic components, preventing catastrophic electrical back-feeding.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVibration-Proof Hardware Latching:\u003c\/strong\u003e Despite its sub-fractional 0.2 lbs net weight, the rugged integrated retention mechanism is officially rated to withstand sustained mechanical vibration profiles up to 5g at frequencies between 10 and 500 Hz, making it suitable for mounting on heavy industrial engine frames or manufacturing skids.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical FAQs\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ1: What does the 718.36 µA excitation current specification mean for my sensor choice?\u003c\/strong\u003e\u003cbr\u003e\nA1: This value represents the internal constant current the module injects across the RTD element to calculate resistance. This current level is optimized to minimize self-heating errors in the sensor tip while maintaining an excellent signal-to-noise ratio.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ2: Can I wire 2-wire, 3-wire, or 4-wire RTDs to the 1794-IR8 module?\u003c\/strong\u003e\u003cbr\u003e\nA2: The module provides excellent lead-wire resistance compensation when paired with standard 3-wire or 4-wire configurations. While 2-wire sensors can be connected by adding physical jumper wires at the terminal base block, they lack line resistance compensation and may introduce ambient offset drift.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ3: What causes a channel fault or broken-wire state to report in the PLC controller tags?\u003c\/strong\u003e\u003cbr\u003e\nA3: The 1794-IR8 features integrated diagnostic logic that monitors field loop continuity. If an field cable breaks, a sensor element fails, or the measured resistance exceeds the 435-Ohm threshold, the channel sets its high-range fault bit to protect downstream automated logic.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":51047662354564,"sku":"1794-IR8","price":103.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/7454\/7844\/files\/1794-IR8-3.jpg?v=1780581704","url":"https:\/\/www.etowonauto.com\/products\/allen-bradley-1794-ir8-flex-i-o-8-channel-rtd-input-module","provider":"Etowon Auto","version":"1.0","type":"link"}