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        1797-IRT8

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        The 1797-IRT8 Thermocouple Input Module is a robust and high-performance module designed for accurate measurement and processing of thermocouple signals in industrial control systems.
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        Warranty Policy
        We provide 1 year warranty for all remaining parts.
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        Return Notice
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        In the event of a defect, we will send new equipment, repair equipment or refund the purchase price based on our availability. You must contact us to obtain a return authorization and return the defective device to us within 14 days of reporting the defect.
        Shipping Mode
        Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.
        Parts Availability
        Apter Power offers a wide range of components, products and services related to industrial automation. We also supply new products from a variety of quality manufacturers.
        How to order
        We have been working hard to update our inventory. If we have stock or parts available for new factory purchases, you can contact the order online. If we do not currently have an inventory, the displayed quantity will show "Ask". Please create an online quote or contact us by phone, fax or email to check availability.

        Technical specifications for 1797-IRT8

        • Manufacturer:
          Allen-Bradley
        • Part Number:
          1797-IRT8
        • Product Family:
          Flex I/O
        • Number of Inputs:
          8 channels
        • Signal Input Range:
          0 to 500 ohms; -40 to 100 mV
        • Lead Resistance Compensation:
          < 15 ohm total
        • Module Field-Side Power Consumption:
          1.6W
        • Operational Temperature:
          20°C to +70°C (-4°F to +158°F)
        • Storage Temperature:
          -40°C to +85°C (-40°F to +185°F)
        • Relative Humidity:
          5% to 95% non-condensing
        • Weight:
          0.2 kg
        • Estimated shipping dimensions:
          13x13x8.7cm
        • Tariff Code:
          8537101190
        • Country of origin:
          USA
        • Place of shipment:
          Xiamen, Fujian, China
        By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

        More Information

        Overview Manuals Specifications Use Cases Communication & Connectivity Monitoring & Control

        Features:

        • Serves as the Input Interface for RTD, Thermocouple, and Millivolt Signals in FLEX Ex Systems
        • Integrates Multi-Type Sensor Compatibility with Four Built-In Diagnostic Alarms
        • Functions Alongside the FLEX Ex I/O System and Compatible ControlLogix/CompactLogix Platforms
        The 1797-IRT8 operates as the FLEX Ex RTD/Thermocouple/mV Input Module within a FLEX Ex distributed I/O rack, providing reliable analog signal acquisition from diverse temperature and voltage sources. It continuously processes incoming signals from 8 independent input channels, converting RTD resistance values, thermocouple EMF voltages, and direct millivolt inputs into digital data for transmission through the FLEX Ex communication adapter to the host controller. Seamless integration with standard FLEX Ex power and communication modules is standard with the 1797-IRT8, and its intrinsic safety design allows direct connection to sensors installed in hazardous area locations (Zone 0, 1, or 2) without requiring additional safety barriers. The 1797-IRT8 incorporates comprehensive diagnostics and alarm generation capabilities that represent significant improvements over conventional analog input designs.

        The 1797-IRT8 provides essential temperature and voltage measurement functions common to process control and monitoring applications, and is a critical component of the data acquisition path, directly affecting the accuracy and reliability of the overall control system. One 1797-IRT8 module occupies a single slot in the FLEX Ex rack and supports up to eight field device connections. The module is configured using RSNetWorx for DeviceNet or Studio 5000 software, allowing flexible scaling, alarm setpoints, and channel-specific parameterization.

        For comprehensive process monitoring, the 1797-IRT8 generates four distinct alarm conditions to ensure signal integrity and system safety. In addition to standard input signal processing, the module performs continuous diagnostic monitoring across all active channels. The 1797-IRT8 executes alarm detection using internal circuitry specified in the module firmware. Using this method, the diagnostic system continually monitors the health of each input channel. If the module detects that an input signal is outside the configured measurement range (below minimum or above maximum valid values), it will automatically generate an Underrange or Overrange alarm and update the module status accordingly.

        The 1797-IRT8 Allen-Bradley FLEX Ex RTD/Thermocouple/mV Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
        Allen-Bradley 1797-IRT8 FLEX Ex RTD/Thermocouple/mV Module Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
        Allen-Bradley 1797-IRT8 FLEX Ex RTD/Thermocouple/mV Module Specs

        General

        • Manufacturer Allen-Bradley
        • Model 1797-IRT8
        • Condition New Original ready stock
        • Product Family 1797-TB3 ,1797-TB3S ,1797-OE8
        Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
        • Hazardous Area Temperature Monitoring: Specifically designed for locations where explosive gases, vapors, or dust may be present (ATEX Zone 1/2).
        • Precision Process Sensing: Used with a variety of high-accuracy sensors, including thermocouples (Types J, K, T, etc.), RTDs (Pt100, Pt200), and general millivolt sources.
        • Refining & Chemical Processing: Ideal for monitoring vessel temperatures or chemical reactions where intrinsic safety is mandatory.
        • Marine & Offshore Applications: Often used in harsh industrial settings, supported by certifications like marine-GL.
        • Network Integration: Primary connectivity is via ControlNet Ex networks for high-speed, scheduled data transfer between the module and a programmable controller.
        • Bus Interface: The module connects to the system via the Flexbus using an intrinsically safe terminal base like the 1797-TB3 or 1797-TB3S.
        • I/O Transfer: Uses Block Transfer Read (BTR) and Block Transfer Write (BTW) instructions within ladder logic to exchange configuration and measurement data with the PLC.
        • Wiring Support: Supports 2-, 3-, or 4-wire RTD configurations and uses 12 AWG stranded cables for field connections.
        • High-Speed Sampling: Features a fast 8-millisecond settling time and 16-bit resolution for precise process control.
        • Configurable Filtering: Offers selectable digital firmware filters (ranging from 600 Hz to 0.2 Hz) to balance noise reduction against response speed.
        • Built-in Diagnostics: Provides status monitoring for critical faults, including: Open Wire Detection: Identifies broken sensor connections.
        • Overrange/Underrange: Monitors if signals exceed the 0–485 Ω or -40 to +100 mV limits.
        • CJC Faults: Detects issues with Cold Junction Compensation, essential for accurate thermocouple readings.
        • Visual Indicators: Equipped with 8 red fault LEDs for individual channel monitoring and 1 green module power LED.
        View as PDF
        Description
        The 1797-IRT8 Thermocouple Input Module is a robust and high-performance module designed for accurate measurement and processing of thermocouple signals in industrial control systems. It provides 8 input channels, each capable of receiving temperature signals from thermocouples across a wide range of input conditions. 

        This module is particularly suitable for environments where precise temperature monitoring and control are crucial.Designed for use in hazardous and harsh environments, the 1797-IRT8 features lead resistance compensation to minimize signal degradation, ensuring high accuracy and reliability. With a wide operational temperature range, it can perform efficiently in a variety of industrial applications.

        The 1797-IRT8, a high-performance temperature input module from Allen-Bradley’s FLEX Ex I/O series (a product line of Rockwell Automation), is engineered as a versatile and reliable solution for precision data acquisition in industrial and hazardous environments. 

        Designed to integrate seamlessly with ControlLogix and CompactLogix PLC systems, this 8-channel module supports thermocouple, RTD, and millivolt (mV) sensor inputs—delivering accurate temperature and signal measurement for critical process control, monitoring, and safety applications where reliability, intrinsic safety, and multi-sensor compatibility are paramount.
        Revisions

        Revision Part #

        Also known as

        1797-IRT8 Ser A
        1797-IRT8/A, Series A, Rev A
        Get Parts Quote
        Alternative Names
        I797-IRT8 I797-1RT8 I797-1RTB
        Technical notes
        The 1797-IRT8 module incorporates four independent alarm generation mechanisms to ensure system safety and data accuracy. First, it supports an Underrange alarm function. When the detected input signal falls below the lower limit of the set effective measurement range, the module automatically triggers this alarm, alerting the operator that the signal is abnormally low. Second, the Overrange alarm monitors whether the input signal exceeds the upper limit of the effective measurement range. Once an overshoot is detected, the 1797-IRT8 immediately generates an alarm message to prevent measurement distortion or equipment damage caused by signal overload.
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        FAQS

        The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
        VIEW ALL FAQS
        How many input channels does the 1797-IRT8 module support?
        The 1797-IRT8 module provides 8 input channels, allowing for simultaneous monitoring of multiple thermocouple signals.
        What is the input signal range for the thermocouple channels on the 1797-IRT8?
        The input signal range for each thermocouple channel is 0 to 500 ohms and -40 to 100 mV, covering a wide range of thermocouple signal types and applications.
        What is the power consumption of the 1797-IRT8 module?
        The module consumes 1.6W of power on the field side, making it energy-efficient for use in industrial applications.

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