Overview
The Allen-Bradley 1794-IT8 is a sealed 8-channel thermocouple and millivolt input module designed for the Flex I/O distributed I/O system. This module has eight channels compatible with thermocouple sensors J, K, E, R, N, S, B, C, T and L sensors and accepts +/-76.5mV voltage range. The module provides 8 individually-isolated input channels that accept thermocouple/millivolt inputs, making it ideal for multi-point temperature monitoring in industrial control applications.
Key Features
- Compatible with thermocouple sensors J, K, E, R, N, S, B, C, T and L
- 16-bit resolution with FlexBus current draw of 20 mA
- 8 individually isolated input channels for independent temperature measurement
- Communicates with PLCs through block-transfer programming with input signal data words moving between the module’s memory and the PLC’s data table, and supports configuration word transfers from the PLC to the module
- Sealed design for protection in industrial environments
Technical Specifications
- Input Channels: 8
- Input Type: Thermocouple / Millivolt
- Input Range: ±76.5 mV
- Resolution: 16-bit
- Operating Voltage: 19.2 to 31.2 Volts DC (24 Volts DC nominal) with maximum current rating of 150 milliamps at 24 Volts DC
- Operating Temperature: -20°C to 55°C (-4°F to 131°F)
- Non-operating Temperature: -40°C to 85°C (-40°F to 185°F)
- FlexBus Current: 20 mA
- Communication Protocol: FlexBus (FLEX I/O proprietary network)
- Module Type: Analog Input
Typical Applications
- Multi-point temperature monitoring in process control systems
- Industrial furnace and oven temperature measurement
- HVAC and refrigeration system monitoring
- Manufacturing equipment thermal supervision
- Food processing and packaging line temperature control
- Chemical and pharmaceutical production environments
Compatibility & Replacements
Compatible With
- Allen-Bradley Flex I/O terminal bases (1794-ASB, 1794-AENTR, etc.)
- Allen-Bradley Flex I/O adapter/power supply modules
- Flex I/O distributed I/O systems with FlexBus network
- PLC systems supporting block transfer programming
- RSLogix 500 and Studio 5000 programming platforms
Replaces / Drop-In Replacement For
- Previous generation 1794-IT8 modules with equivalent functionality
- Verify exact compatibility with your system integrator before ordering
Works With
- RSLogix 500 (legacy PLC programming)
- Studio 5000 Logix Designer (modern Allen-Bradley programming platform)
- FlexBus protocol network communication
- Block transfer data movement between module and PLC memory
- Allen-Bradley Flex I/O ecosystems (1794-series components)
