{"product_id":"allen-bradley-1756-irt8i-controllogix-temperature-input-module","title":"Allen-Bradley 1756-IRT8I ControlLogix Temperature Input Module","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\n\u003cp\u003eThe Allen-Bradley \u003cstrong\u003e1756-IRT8I\u003c\/strong\u003e is a high-density, channel-isolated temperature input module designed for the flagship ControlLogix PLC platform. Engineered by Rockwell Automation, this advanced hardware supports up to \u003cstrong\u003e8 isolated input channels\u003c\/strong\u003e, allowing direct connection to Resistance Temperature Detectors (RTDs), Thermocouples, and low-voltage millivolt (mV) linear signals. By implementing strict channel-to-channel electrical isolation, the module eliminates ground loops and systemic electrical noise, making it highly reliable for harsh process manufacturing plants.\u003c\/p\u003e\n\u003cp\u003eWeighing a rigid and substantiative \u003cstrong\u003e0.34 kg (approx. 0.75 lbs) net\u003c\/strong\u003e, the robust build profile of this module reflects its industrial-grade internal shielding and isolation components. Featuring a premium \u003cstrong\u003e24-bit analog-to-digital resolution\u003c\/strong\u003e (0.01 µV per count) and a pinpoint accuracy rating of \u003cstrong\u003e±0.3°C\u003c\/strong\u003e, the 1756-IRT8I delivers exceptional measurement depth. Its rapid 1ms scan time allows for immediate loop updates, which makes it ideal for highly sensitive thermal environments like pharmaceutical batch processing, complex chemical reactors, and industrial furnace control chambers where minor temperature fluctuations impact product safety and quality boundaries.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; margin-top: 15px; margin-bottom: 20px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color: #f2f7fc;\"\u003e\n\u003cth style=\"border: 1px solid #a9bccc; text-align: left; padding: 10px; width: 40%;\"\u003eParameter \/ Field\u003c\/th\u003e\n\u003cth style=\"border: 1px solid #a9bccc; text-align: left; padding: 10px;\"\u003eOfficial System Specification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #a9bccc; font-weight: bold; padding: 10px;\"\u003eModule Classification\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #a9bccc; padding: 10px;\"\u003eControlLogix Temperature Sensing Input (RTD \/ TC \/ mV)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f9fbfd;\"\u003e\n\u003ctd style=\"border: 1px solid #a9bccc; font-weight: bold; padding: 10px;\"\u003eChannel Architecture\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #a9bccc; padding: 10px;\"\u003e8 independent, channel-to-channel isolated points\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #a9bccc; font-weight: bold; padding: 10px;\"\u003eA\/D Converter Resolution\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #a9bccc; padding: 10px;\"\u003e24-bit resolution (0.01μV\/count scaling)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f9fbfd;\"\u003e\n\u003ctd style=\"border: 1px solid #a9bccc; font-weight: bold; padding: 10px;\"\u003eInstrument Accuracy\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #a9bccc; padding: 10px;\"\u003e±0.3°C with integrated CJC compensation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #a9bccc; font-weight: bold; padding: 10px;\"\u003eModule Scan Time\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #a9bccc; padding: 10px;\"\u003e1 millisecond (ms)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f9fbfd;\"\u003e\n\u003ctd style=\"border: 1px solid #a9bccc; font-weight: bold; padding: 10px;\"\u003eRTD Signal Ohm Ranges\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #a9bccc; padding: 10px;\"\u003e1–500 Ω up to 8–4000 Ω bounds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #a9bccc; font-weight: bold; padding: 10px;\"\u003eThermocouple Signal Range\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #a9bccc; padding: 10px;\"\u003e-100 to +100 millivolts (mV)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f9fbfd;\"\u003e\n\u003ctd style=\"border: 1px solid #a9bccc; font-weight: bold; padding: 10px;\"\u003eBackplane Current Draw\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #a9bccc; padding: 10px;\"\u003e200 mA @ 5.1V DC | 150 mA @ 24V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #a9bccc; font-weight: bold; padding: 10px;\"\u003eNormal Mode Rejection\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #a9bccc; padding: 10px;\"\u003e75 dB noise immunity\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f9fbfd;\"\u003e\n\u003ctd style=\"border: 1px solid #a9bccc; font-weight: bold; padding: 10px;\"\u003eNet Module Weight\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #a9bccc; padding: 10px;\"\u003e0.34 kg (0.75 lbs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #a9bccc; font-weight: bold; padding: 10px;\"\u003eHardware Compatibility\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #a9bccc; padding: 10px;\"\u003eFits standard 1756 ControlLogix chassis racks\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eAdvanced Engineering Capabilities\u003c\/h2\u003e\n\u003ch3\u003eCold Junction Compensation (CJC)\u003c\/h3\u003e\n\u003cp\u003eTo deliver precise thermocouple metrics, the 1756-IRT8I requires specific terminal housing blocks embedded with **Dual CJC sensors**. These dedicated sensors monitor localized temperature fluctuations at the physical connection blocks, allowing the hardware logic to continuously cross-reference thermal differentials and hold the system accuracy stable at ±0.3°C.\u003c\/p\u003e\n\u003ch3\u003eAutomated Calibration \u0026amp; Fault Detection\u003c\/h3\u003e\n\u003cp\u003eThe module eliminates the need for manual, scheduled tool calibrations by initiating an autonomous **auto-calibration routine** on every power cycle. Furthermore, built-in **wire break detection** active diagnostics sample line resistance profiles continuously. If a field sensor burns out or suffers a snapped lead wire, the hardware flags a channel fault tag within 2 to 5 seconds, prompting operators before control values drift dangerously.\u003c\/p\u003e\n\u003ch3\u003eBroad Multi-Sensor Compatibility\u003c\/h3\u003e\n\u003cp\u003eThe 1756-IRT8I simplifies inventory footprint management by supporting an array of industry sensors out of a single slot:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupported RTD Elements:\u003c\/strong\u003e Platinum (100 Ω, 200 Ω, 500 Ω, 1000 Ω), Nickel (100 Ω, 120 Ω, 200 Ω, 500 Ω), and Copper (10 Ω).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupported Thermocouple Types:\u003c\/strong\u003e Specialized and high-temp classes including Types B, C, D, E, J, K, N, R, S, T, and TXK\/XK.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eInstallation Requirements\u003c\/h2\u003e\n\u003cp\u003ePlease note that the 1756-IRT8I utilizes a unique high-density \u003cstrong\u003e36-pin Removable Terminal Block (RTB)\u003c\/strong\u003e connector scheme. It is completely incompatible with standard 20-pin RTB units used by lower-density analog modules. Due to the 36-pin block profile and the 0.34 kg internal component mass, ensure the RTB side screws are firmly anchored to prevent mechanical sagging. Installers must order the \u003cstrong\u003e1756-TBCH\u003c\/strong\u003e (extended depth screw-clamp block) or the \u003cstrong\u003e1756-TBS6H\u003c\/strong\u003e (extended depth spring-clamp block) to establish safe and proper field terminations.\u003c\/p\u003e\n\u003ch2\u003eTechnical FAQs\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eQ1: What is the benefit of the 24-bit conversion resolution over typical 16-bit analog input modules?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA1: A 24-bit resolution provides up to 0.01 µV per binary count, enabling the module to read subtle thermal shifts that 16-bit systems ignore. This grain-level tracking results in tight loop stability, allowing the PID loops within the ControlLogix processor to react to fractional variations before process trends deviate.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ2: Why does the module draw power across both the 5.1V and 24V backplane current buses?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA2: The module splits its power duties to isolate signal paths cleanly. The 200 mA current draw on the 5.1V rail powers the internal microprocessors, A\/D converters, and digital backplane communication links. The 150 mA current draw on the 24V rail runs the analog input conditioning blocks and maintains the high-potential electrical isolation barrier between channels.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ3: Can I mix RTDs and Thermocouples on the same 1756-IRT8I module simultaneously?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA3: Yes. Because every single channel is completely isolated and possesses independent configuration parameters, you can customize each point individually in Studio 5000 Logix Designer. Channel 0 can track a Type K thermocouple while Channel 1 is configured to process a Pt100 RTD without any cross-talk or impedance issues.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":51047654817924,"sku":"1756-IRT8I","price":199.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/7454\/7844\/files\/1756-IRT8I.jpg?v=1785154955","url":"https:\/\/www.etowonauto.com\/ms\/products\/allen-bradley-1756-irt8i-controllogix-temperature-input-module","provider":"Etowon Auto","version":"1.0","type":"link"}