Allen-Bradley 1794-IRT8
Allen-Bradley 1794-IRT8
Allen-Bradley 1794-IRT8
Allen-Bradley 1794-IRT8
Allen-Bradley 1794-IRT8
Allen-Bradley 1794-IRT8
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1794-IRT8

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The Allen-Bradley 1794-IRT8 is a FLEX I/O temperature and millivolt input module that supports thermocouple and RTD signal acquisition across multiple industrial channels.
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Technical specifications for 1794-IRT8

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1794-IRT8
  • Product Family:
    Flex I/O
  • Product Type:
    Flex 8 Point Thermocouple RTD Module
  • Number of inputs:
    8 channels (2 groups of 4)
  • Module location:
    1794-TB3G, 1794-TB3GS, 1794-TB3GK terminal base units
  • Nominal input voltage ranges:
    40…+100 mV DC for thermocouples, 0…325 mV for RTDs
  • Resolution:
    14 bits
  • Common mode rejection:
    -80 dB @ 5V peak-to-peak, 50…60 Hz
  • Common mode input range, min:
    +15V
  • Isolation voltage (continuous voltage withstand rating):
    50V (continuous)
  • Open input detection time:
    Immediate detection (max 2 scans)
  • Overvoltage capability:
    15V DC continuous at 25 °C
  • Overall drift with temperature, max:
    50 ppm/°C of span
  • Cold junction compensation range:
    -20…+100 °C
  • Cold junction compensator:
    1794-CJC2
  • Flexbus:
    5V DC, 40 mA
  • Power dissipation, max:
    3.0 W @ 31.2V DC
  • Thermal dissipation, max:
    10.2 BTU/hr @ 31.2V DC
  • Keyswitch position:
    -20°C to +70°C (-4°F to +158°F).
  • Weight:
    0.1 kg
  • Estimated shipping dimensions:
    9.3x5.3x4.5cm
  • Tariff Code:
    6914100000
  • 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 Compliance & Safety Installation & Wiring

Features:

  • Supports up to 8 channels for thermocouple, RTD, and millivolt signal inputs in a single FLEX I/O module.
  • Provides 14-bit resolution with strong noise immunity and -80 dB common mode rejection for stable industrial measurements.
  • Integrates advanced diagnostics including wire-off detection, CJC monitoring, and rapid fault response within two scans.
The Allen-Bradley 1794-IRT8 is widely used in distributed automation systems where precise temperature and analog signal acquisition is required. It supports a combination of thermocouple, RTD, and millivolt inputs within a compact FLEX I/O structure. This makes the Allen-Bradley 1794-IRT8 suitable for process monitoring environments that demand flexible sensor integration. Its modular design allows engineers to expand I/O capacity without large rack systems. The Allen-Bradley 1794-IRT8 is often deployed in control cabinets where space efficiency and scalability are important considerations.

In industrial control applications, the Allen-Bradley 1794-IRT8 connects through FLEX I/O adapters and terminal base units to ensure seamless communication with programmable controllers. Each Allen-Bradley 1794-IRT8 module operates as part of a distributed architecture that supports up to eight terminal bases per adapter. This structure helps reduce wiring complexity while maintaining reliable signal transmission. The Allen-Bradley 1794-IRT8 also supports firmware-based configuration, eliminating the need for physical switches. Its integration approach makes it suitable for modern automation systems requiring flexible deployment.

The Allen-Bradley 1794-IRT8 provides accurate measurement performance through 14-bit resolution and strong electrical noise resistance. The Allen-Bradley 1794-IRT8 includes common mode rejection capability of -80 dB and supports stable operation in electrically noisy environments. It also features isolation rated at 50 V continuous and built-in detection for wiring faults and signal anomalies. With support for thermocouple and RTD input ranges, the Allen-Bradley 1794-IRT8 ensures adaptable use across different industrial sensing requirements. These capabilities make it suitable for continuous process monitoring and control feedback systems.

The 1794-IRT8 Allen-Bradley Flex 8 Point Thermocouple RTD Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Allen-Bradley 1794-IRT8 Flex 8 Point Thermocouple RTD 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 1794-IRT8 Flex 8 Point Thermocouple RTD Module Specs

General

  • Manufacturer Allen-Bradley
  • Model 1794-IRT8
  • Condition New Original ready stock
  • Product Family 1794-IRT8/A,1794-IRT8/B,1794-IRT8XT
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.
  • Metallurgical High-Temperature Monitoring: Data acquisition from thermocouples operating at temperatures above 1000°C in smelting furnaces.
  • Cold Chain Temperature Monitoring: High-precision PT100 resistance thermometer measurement in pharmaceutical cold storage.
  • Motor Bearing Protection: Multi-channel real-time temperature monitoring of bearings with pre-embedded RTDs in large pump sets.
  • Chemical Reaction Control: Intrinsically safe explosion-proof isolation input for multiple temperature signals in hazardous areas.
  • Certification: Meets CE, c-UL-us, and Class I Div 2 explosion-proof standards.
  • Isolation: Continuous 500V AC isolation protection between the channel and the system.
  • Environment: Must be installed in an enclosure with an IP54 or higher protection rating.
  • Operation: Never plug or unplug modules while the system is energized or in an environment with an explosion risk.
  • Base: The module must snap into the 1794-TB3 or 1794-TB3S terminal base.
  • Alignment: Align the guide strip on the module with the base slot and press vertically downwards.
  • Locking: Rotate the locking screw on the top of the module clockwise to secure it to the base.
  • Shielding: The shielding of the thermocouple and RTD signal lines must be grounded at one end.
Description
The Allen-Bradley 1794-IRT8 is a FLEX I/O thermocouple, RTD, and millivolt input module designed to handle up to 8 input channels. It processes temperature and analog voltage signals using non-isolated analog multiplexing technology. Each module can accept thermocouple inputs, 2-, 3-, and 4-wire RTD inputs, as well as millivolt sources. The design supports both industrial temperature monitoring and low-level signal measurement. It is commonly used in distributed I/O architectures where flexible sensor integration is required.

The 1794-IRT8 operates within the FLEX I/O system, which includes an adapter, terminal base unit, DIN rail mounting, power supply, and connecting cables. Each adapter supports up to eight terminal bases, allowing scalable system expansion. The module installs on terminal base units such as 1794-TB3G, 1794-TB3GS, and 1794-TB3GK. Communication and configuration are managed through the FLEX I/O adapter, which transfers both process data and status information. This architecture allows seamless integration into programmable controller environments.

The Allen-Bradley 1794-IRT8 provides 14-bit resolution for precise signal conversion and supports input ranges of -40 to +100 mV for thermocouples and 0 to 325 mV for RTDs. It features strong noise immunity with -80 dB common mode rejection at 50–60 Hz. The module supports a common mode input range minimum of +15 V and includes 50 V continuous isolation voltage rating. Maximum power dissipation is 3.0 W at 31.2 V DC, ensuring stable operation in control cabinets. These characteristics enable accurate signal processing in electrically noisy environments.

Cold junction compensation is managed through the 1794-CJC2 compensator, which is required during thermocouple operation, and two units are supplied with each 1794-IRT8 module. The cold junction compensation range spans -20 to +100 °C, ensuring accurate thermocouple readings across varying environmental conditions. The Series B version introduces support for grounded thermocouples, expanding application flexibility. It also provides enhanced diagnostic functions such as CJC status and alarm bit reporting. Open input conditions are detected quickly, with fault response occurring within two scan cycles.

Installation of the Allen-Bradley 1794-IRT8 involves mounting the terminal base on a 35 x 7.5 mm DIN rail and ensuring correct Flexbus connection alignment. Wiring is terminated directly at the terminal base, supporting secure and structured field connections. The module operates without physical switches or jumpers, as configuration is managed through firmware and controller settings. It supports overvoltage capability of 15 V DC continuous at 25 °C and includes wire-off, overrange, and underrange detection functions. These installation and diagnostic features simplify setup and enhance system reliability.
Revisions

Revision Part #

Also known as

1794-IRT8 Ser A
1794-IRT8/A, Series A, Rev A
1794-IRT8 Ser B
1794-IRT8/B, Series B, Rev B
Alternative Names
1794-1RT8 1794-IRTB 17941RT8 1794IRT8 1794-IRT8XT 1794-IB16 1794-OA8I 1794-IV16
Technical notes
The Allen-Bradley 1794-IRT8 is an 8-channel FLEX I/O temperature input module with 14-bit resolution, 50 V continuous isolation, and integrated thermocouple/RTD signal processing capability.
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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.
What input capability does Allen-Bradley 1794-IRT8 support for multi-sensor applications?
The Allen-Bradley 1794-IRT8 supports 8 input channels for thermocouple, RTD, and millivolt signals in distributed I/O systems.
Why does Allen-Bradley 1794-IRT8 require cold junction compensation in temperature measurement setups?
The Allen-Bradley 1794-IRT8 uses 1794-CJC2 compensators to maintain accuracy within a -20 to +100 °C compensation range during thermocouple operation.
How does Allen-Bradley 1794-IRT8 handle signal accuracy in noisy industrial environments?
The Allen-Bradley 1794-IRT8 provides -80 dB common mode rejection at 50–60 Hz along with 14-bit resolution for stable measurement performance.
What wiring flexibility is available when deploying Allen-Bradley 1794-IRT8 in field installations?
The Allen-Bradley 1794-IRT8 supports 2-, 3-, and 4-wire RTD configurations along with thermocouple and millivolt inputs.

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