Allen‑Bradley 1771‑IXE Thermocouple / Millivolt Input Module

The Allen‑Bradley 1771‑IXE is an 8‑channel isolated thermocouple and millivolt input module for Rockwell PLC‑5 controllers and 1771 I/O chassis. It receives weak temperature signals from thermocouple sensors and converts analog readings into digital data for the PLC processor.

This legacy intelligent I/O module adopts differential floating inputs and built‑in cold junction compensation. Since original production has been discontinued, it is widely supplied as aftermarket spare parts for maintenance and renovation of existing process temperature monitoring systems.

Main Specifications

1. Brand: Allen‑Bradley (Rockwell); Model:1771‑IXE; Type:Thermocouple/Millivolt Input Module
2. Applicable Platform: PLC‑5 controllers, 1771 series I/O rack chassis
3. Channel Count:8 differential isolated input channels
4. Supported Sensors: E,J,K,T,R,S thermocouples and ±100mV low voltage signals
5. Resolution:15‑bit with sign, built‑in cold junction compensation (CJC)
6. Backplane Power:850mA at 5V DC, powered through chassis backplane
7. Operating Temperature:0℃ ~ +60℃, designed for industrial cabinet installation
8. Installation:Single‑slot plug‑in mounting inside standard 1771 I/O chassis

Core Functions

1. Capture weak millivolt signals from field thermocouple temperature sensors.
2. Perform linearization and cold‑junction compensation to get accurate temperature values.
3. Convert analog sensor signals into digital data and communicate with PLC via block transfer.
4. Detect open‑circuit thermocouple faults and send diagnostic status information.
5. Channel‑to‑channel isolation reduces common‑mode interference and ground loop noise.
6. Provide stable temperature measurement data for furnace, oven and continuous process control.

Application Scenarios

1. Temperature monitoring and data acquisition for chemical, power and metallurgy process lines.
2. Spare module replacement and routine maintenance of PLC‑5 and 1771 I/O racks.
3. Retrofit and reliability upgrade of old factory temperature control cabinets.
4. On‑site troubleshooting and faulty thermocouple input module replacement projects.
5. Spare‑parts stocking for automation integrators and industrial maintenance contractors.
6. Global aftermarket spare supply for technicians maintaining legacy Rockwell 1771 I/O hardware.

FAQ

1. Q: Which PLC series is 1771‑IXE compatible with?
   A: It is designed for Allen‑Bradley PLC‑5 systems and must be installed in a 1771 I/O chassis.
2. Q: Can different thermocouple types be mixed on one module?
   A: It supports 4 channels of one type plus another 4 channels of a second thermocouple type.

3. Q: Is this module still in original production?
   A: The original product has been discontinued, available as tested surplus or refurbished spare parts only.