Allen Bradley 1771-IXE 8-Channel Thermocouple Input Module

Product Overview

The Allen-Bradley 1771-IXE is an 8-channel thermocouple/millivolt input module for the PLC-5 platform. It supports E, J, K, T, R, and S type thermocouples with cold junction compensation, delivering 1°C or 1°F temperature resolution and 10 microvolt millivolt resolution for precise process temperature monitoring.

Technical Specs

• Input channels: 8 differential, configurable for thermocouple or millivolt
• Thermocouple types: E, J, K, T, R, S
• Millivolt range: ±100 mV
• Temperature resolution: 1°C or 1°F
• Millivolt resolution: 10 µV
• Cold junction compensation: 0-60 °C range
• Backplane current: 750 mA @ 5 V DC
• Wiring arm: 1771-WI
• Data format: 4-digit BCD, complementary binary, or signed magnitude binary

Key Features

• Mixed input configuration: 4 channels of one type plus 4 of another
• Automatic cold junction compensation for accurate thermocouple readings
• Open-circuit detection for failed thermocouples
• Per-channel automatic offset and gain calibration
• Software calibration eliminates potentiometer adjustments

FAQ

• Which wiring arm is required? The 1771-WI wiring arm is specifically designed for the IXE module.
• Can I mix thermocouple types? Yes, the module allows 4 channels of one input type and 4 of another.
• What happens if a thermocouple fails? The module detects open circuits and reports the fault to the processor.

Installation Guide

1. Power down the 1771 I/O chassis.
2. Insert the module into any slot except the leftmost.
3. Attach the 1771-WI wiring arm.
4. Wire thermocouples observing correct polarity; use thermocouple extension wire.
5. Configure input types and scaling via block-transfer instructions in the PLC program.

Selection Tips

• Select 1771-IXE for multi-point thermocouple temperature monitoring.
• For RTD sensors, use the 1771-IR module instead.
• Verify chassis power budget: 750 mA backplane current per module.