1794-IRT8 | Allen Bradley | FLEX I/O 8-Channel Thermocouple & RTD Input Module

Product Description

The Allen Bradley FLEX I/O 1794-IRT8 Analog Input Module is designed for precise temperature measurement and monitoring in distributed control systems. Supporting both thermocouple and RTD inputs, this module provides high-resolution signal acquisition across 8 channels, organized into two groups of four. With robust isolation, configurable terminal base compatibility, and reliable performance under industrial conditions, it is a versatile solution for process automation.

Technical Specifications

• Model / Part Number 1794-IRT8

• Manufacturer Allen Bradley (Rockwell Automation)

• Product Line FLEX I/O Series

• Product Type Thermocouple/RTD Input Analog Module

• Number of Inputs 8 channels (2 groups of 4)

• Terminal Base Compatibility 1794-TB3G, 1794-TB3GS, 1794-TB3GK

• Nominal Input Voltage Ranges

• Thermocouples: –40 to +100 mV DC

• RTDs: 0 to +325 mV DC

• Resolution 14 bits

• Isolation Voltage 50 V continuous (basic insulation type); type tested at 1365 V AC for 60 s between field and system sides

• Flexbus Current 40 mA (operating), 20 mA nominal

• Power Dissipation 3.0 W max @ 31.2 V DC

• Thermal Dissipation 10.2 BTU/hr max @ 31.2 V DC

• Keyswitch Position 3

• Indicators 1 red/green power status LED

• Relative Humidity 5–95% non-condensing (IEC 60068-2-30)

• Vibration Resistance 5 g @ 10–500 Hz (IEC 60068-2-6)

• Dimensions (L × W × H) 6.9 × 9.4 × 9.4 cm

• Weight 2 kg

Application Scenarios

• Industrial process control requiring precise thermocouple and RTD measurements

• Distributed I/O systems needing compact, high-resolution analog input modules

• Environments with strict vibration and humidity requirements

FAQ

Q: How many input channels does the 1794-IRT8 support?  A: It supports 8 channels, divided into two groups of four.

Q: Which terminal bases are compatible?  A: 1794-TB3G, 1794-TB3GS, and 1794-TB3GK.

Q: What resolution does the module provide?  A: 14-bit resolution for accurate signal acquisition.

Q: Is channel-to-channel isolation provided?  A: No, isolation is between field side and system only.

Comparison with Similar Models

• 1794-IRT8: 8-channel thermocouple/RTD input, 14-bit resolution

• 1794-IR8: RTD-only input module, 8 channels

• 1794-IT8: Thermocouple-only input module, 8 channels