1794-IRT8XT

Overview

The 1794-IRT8XT is an Allen-Bradley RTD analog input module with 8 channels, designed for precise temperature measurement and integration into FLEX I/O systems.

Module Identity

• Model: 1794-IRT8XT

• Type: RTD Analog Input Module

• Manufacturer: Rockwell Allen-Bradley

• Channels: 8 (2 groups of 4)

• Module Location: Compatible with 1794-TB3G, 1794-TB3GS, 1794-TB3GK terminal base units

Input Specifications

• Nominal Input Voltage Ranges:

  • -40…+100 mV DC for thermocouples

  • 0…325 mV for RTDs

  • Default: mV mode

• Resolution: 14 bits

• Accuracy vs. Filter Cutoff:

  • 0.05% of full range in millivolt mode with filtering selected

  • 0.10% of full range in millivolt mode (hardware only)

Data Format

• °C (implied decimal point XXX.X)

• °F (implied decimal point XXX.X)

• °K (implied decimal point XXX.X)

• -32767…+32767

• 0…65535

• 0…5000 (ohms mode, implied decimal point XXX.X)

• -4000…+10000 (millivolt mode, implied decimal point XXX.XX)

Electrical Characteristics

• Common Mode Rejection: -80 dB @ 5V peak-to-peak, 50…60 Hz

• Common Mode Input Range (min): +15 V

• Flexbus: 5 V DC, 40 mA

• Power Dissipation (max): 3.0 W @ 31.2 V DC

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

Indicators

• 1 green power status indicator

• 8 red open input indicators

Physical Data

• Keyswitch Position: 3

• Weight: 0.20 kg

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