Allen Bradley 1769-IT6 CompactLogix 6-Channel Thermocouple Input Module

Product Description

The 1769-IT6 (1769-IT6) is a high-performance analog temperature input module designed for Allen-Bradley CompactLogix and MicroLogix 1500 controller platforms. It provides six isolated channels for thermocouple or millivolt signals, enabling precise thermal monitoring in critical industrial processes. The module features integrated Cold Junction Compensation (CJC) and sophisticated Sigma-Delta analog-to-digital conversion to ensure measurement accuracy even in electrically noisy environments.

Designed for versatility, the 1769-IT6 (1769-IT6) allows per-channel configuration, meaning engineers can mix different thermocouple types on a single module. With built-in open-circuit detection and lead-wire compensation, it maintains system integrity by identifying sensor failures immediately. This module is the standard choice for applications requiring rigorous temperature regulation, such as plastic extrusion, heat treatment furnaces, and chemical reactors.

Detailed Technical Specifications

The following specifications detail the hardware capabilities and measurement precision of the 1769-IT6:

• Manufacturer: Rockwell Automation / Allen-Bradley

• Model Number: 1769-IT6

• Input Channels: 6 Differential Thermocouple or Millivolt

• Supported Thermocouple Types: J, K, T, E, R, S, B, N, C

• Millivolt Range: ±50 mV and ±100 mV

• Resolution: 14-bit (normal), up to 16-bit (configured for higher precision)

• A/D Conversion Type: Sigma-Delta

• Cold Junction Compensation: Integrated thermistors at terminal block

• Input Impedance: Greater than 10 MΩ

• Common Mode Rejection: >115 dB @ 50/60 Hz

• Normal Mode Rejection: >85 dB @ 50/60 Hz

• Data Format: Engineering Units, Percent of Range, Raw Data, Scaled-for-PID

• Backplane Current Draw: 100 mA @ 5.1V DC; 45 mA @ 24V DC

• Power Supply Distance Rating: 8 modules (must be within 8 slots of power supply)

• Isolation Voltage: 30V AC/DC continuous (Working); 500V DC tested for 1 second

• Open-Circuit Detection: User-configurable for Upscale, Downscale, or Zero

• Operating Temperature: 0 °C to 60 °C (32 °F to 140 °F)

Key Functional Features

• Universal Thermocouple Compatibility: Native support for almost all standard industrial thermocouples (B, C, E, J, K, N, R, S, T) ensures broad application utility.

• Onboard Signal Filtering: Digital filtering reduces the impact of 50/60 Hz power line noise, delivering stable temperature readings.

• CJC Accuracy: Integrated thermistors at the terminal block automatically compensate for ambient temperature changes at the module's connection points.

• Efficient Power Management: The module derives all necessary operating power directly from the 1769 backplane; no external 24V supply is required for sensor excitation.