Allen‑Bradley 1771‑IR RTD Resistance Input Module

The Allen‑Bradley 1771‑IR is a dedicated RTD resistance input module for Allen‑Bradley PLC‑5 1771 I/O chassis system. It receives resistance signals from RTD temperature sensors and converts them into digital data for PLC‑5 controller to realize temperature monitoring and process control.

This module supports multiple RTD sensor types, with built‑in signal conditioning and open‑wire detection function. It is a key spare component for maintenance and retrofitting of legacy industrial temperature measurement control cabinets.

Main Specifications

• Brand: Allen‑Bradley; Model:1771‑IR; Type: RTD Resistance Input Module
• Applicable System: PLC‑5 series with 1771 back‑plane chassis
• Signal Type: Multi‑channel RTD resistance temperature input
• Function: Resistance‑digital conversion, signal conditioning and temperature data transmission
• Installation: Slot‑mounted inside 1771 PLC rack
• Operating Environment: 0℃ ~ +60℃, 5%‑95% RH non‑condensing
• Certifications: CE, compliant with industrial PLC automation standards

Core Functions

• Receive resistance signals from field RTD temperature sensors for temperature acquisition.
• Complete signal conditioning and resistance‑digital conversion for accurate temperature reading.
• Transmit converted temperature data to PLC‑5 CPU for monitoring and interlock logic processing.
• Detect sensor open‑circuit fault and feed back alarm status to control system.
• Backplane bus connection supports quick plug‑in replacement for on‑site maintenance work.
• Match legacy Allen‑Bradley programming software for sensor type selection and channel configuration.

Application Scenarios

• Legacy production line control cabinets built on Allen‑Bradley PLC‑5 platform.
• Temperature measurement units for chemical, metallurgy, power and water‑treatment industries.
• Retrofit and spare replacement of legacy 1771 series PLC automation platforms.
• Preventive maintenance and temperature signal channel fault repair projects.
• Spare parts inventory for automation integrators and engineering contractors.

• Global aftermarket spare supply for technical teams maintaining Allen‑Bradley industrial hardware.