Allen-Bradley 1771-IR/D

Allen-Bradley 1771-IR/D

Overview

The Allen-Bradley 1771-IR/D is a 2-channel RTD analog input module designed for use with the PLC-5 system and installed in 1771 I/O chassis. It reads resistance signals from RTDs and converts them into temperature values for process control applications. This module supports multiple RTD types and ensures high-precision temperature input with built-in signal conditioning.

Key Features

• Input Type: RTD (Resistance Temperature Detector)

• Channels: 2 differential inputs

• Supported RTDs: 100 Ω platinum, 120 Ω nickel, 10 Ω copper

• Mounting: 1771 chassis (PLC-5 system)

• Cold Junction Compensation: Built-in

• Backplane Communication: Standard analog input format

• Status Indicators: Channel fault and module power LEDs

• Isolation: Channel-to-backplane optical isolation

Technical Specifications

• Catalog Number: 1771-IR/D

• Number of Channels: 2

• Input Signal Type: Resistance from RTDs

• Supported RTDs: 100 Ω Pt, 120 Ω Ni, 10 Ω Cu

• Nominal Resistance Range: Up to 120 Ohms

• Backplane Current Draw: 700 mA @ 5V DC

• Operating Temperature: 0°C to 60°C

• Storage Temperature: –40°C to +85°C

• Module Type: Analog RTD input

• Chassis Compatibility: 1771-A1B, A2B, A3B, A4B

• Indicators: Fault and channel LEDs

Applications

• Process temperature monitoring

• Industrial automation systems

• Control panels with RTD sensors

• Manufacturing environments requiring precision temperature input

• Legacy system maintenance with PLC-5

Why Choose the 1771-IR/D

• Accurate Temperature Measurement: Converts RTD input to usable analog signals

• Broad RTD Compatibility: Works with multiple RTD types

• Diagnostic LEDs: Provide real-time status and fault indication

• Proven Legacy Integration: Reliable in long-term PLC-5 installations

• Robust Design: Engineered for industrial operating conditions