Product Description – Allen-Bradley 1771-IXHR Thermocouple / mV Input Module

Overview

The Allen-Bradley 1771-IXHR is a high-resolution thermocouple and millivolt input module designed for PLC-5 systems. It delivers accurate temperature measurement across eight differential channels and supports a broad range of thermocouple types. Moreover, the module provides stable acquisition of low-level millivolt signals, making it suitable for demanding industrial environments where precise thermal control is essential.

This module continues to play an important role in legacy automation platforms within process plants, power facilities, and petrochemical operations. In addition, its high-resolution A/D conversion allows engineers to monitor temperature trends with confidence and minimal drift over long operating periods.

Technical Specifications

Model Number: 1771-IXHR
Type: High-Resolution Thermocouple / mV Input Module
System Compatibility: Allen-Bradley PLC-5 chassis
Number of Input Channels: 8 differential channels
Supported Thermocouple Types: J, K, T, E, R, S, B, N
Input Range: –10 mV to +70 mV
Resolution: 16-bit A/D
Accuracy: ±0.25 °C typical
Cold Junction Compensation: Built-in
Diagnostics: Open-circuit detection, over-range monitoring
Isolation: Channel-to-system isolation
Power Consumption: 2.5 W @ 5 V DC
Dimensions: 290 × 35 × 140 mm
Weight: 0.9 kg
Operating Temperature: 0 °C to +60 °C
Storage Temperature: –40 °C to +85 °C
Humidity: 5–95% RH, non-condensing
Certifications: CE, UL, CSA
Lifecycle Status: Discontinued
Country of Origin: USA