Allen-Bradley 1794-IT8 FLEX I/O Thermocouple Module

Overview

The 1794-IT8 by Allen-Bradley is a FLEX I/O thermocouple and millivolt analog input module designed for high-accuracy temperature and low-level voltage monitoring in industrial automation systems. The module supports eight independently configurable input channels and interfaces directly with multiple thermocouple sensor types as well as millivolt signal devices.

Designed for distributed I/O architectures, the module integrates with FLEX I/O terminal base units and communicates through block transfer operation. Its compact construction and high-resolution analog conversion make it suitable for process monitoring, thermal control systems, furnace applications, and manufacturing environments requiring precise temperature acquisition.

Key Features

• Eight thermocouple or millivolt input channels

• Compatible with J, K, E, R, N, S, B, C, T, and L thermocouple types

• Accepts low-level analog signals up to ±76.5 mV

• High-precision 16-bit analog-to-digital conversion

• Supports 2’s complement and offset binary data formats

• Integrated cold junction compensation support

• Designed for FLEX I/O distributed control platforms

• LED power and diagnostics indication

• DIN rail mounting through FLEX terminal bases

Technical Specifications

Application Areas

The 1794-IT8 module is commonly used in industrial temperature monitoring and precision analog sensing applications, including:

• Furnace and kiln temperature control

• Food and beverage processing systems

• Chemical process automation

• Heat treatment equipment

• Packaging and material handling systems

• Energy and utility process monitoring

• OEM machinery with distributed I/O requirements

Compatibility Information

The module is engineered for Allen-Bradley FLEX I/O platforms and installs onto compatible terminal base units including:

• 1794-TB2

• 1794-TB3

• 1794-TB3T

It can be integrated with ControlLogix, CompactLogix, PLC-5, and SLC systems through appropriate FLEX I/O communication adapters.

FAQ

What signal types does the 1794-IT8 support?

The module accepts thermocouple inputs and low-level millivolt signals within a ±76.5 mV range.

Does the module provide channel isolation?

The module provides isolation protection suitable for industrial analog signal environments with an isolation voltage rating of 850 VDC.

Which thermocouple types are compatible?

Supported sensor types include J, K, E, R, N, S, B, C, T, and L thermocouples.

What is required for installation?

The module mounts on FLEX I/O terminal bases such as the 1794-TB2, 1794-TB3, or 1794-TB3T and requires a compatible FLEX I/O adapter for network communication.