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

The Allen-Bradley 1769-IT6, also cataloged as the 1769-IT6 Compact I/O Thermocouple/mV Input Module, operates as a dedicated hardware component for precision temperature and millivolt signal conversion within CompactLogix and MicroLogix 1500 networks. The module interfaces six input channels plus two Cold Junction Compensation (CJC) sensors, converting low-level millivolt and thermocouple signals into digital temperature readings using a Delta-Sigma converter architecture.

Hardware Specifications

Industrial Control & Drive Integration

The high-resolution input module leverages backplane bus communication velocity to stream converted thermal data tables directly to the system processor. Continuous automatic background calibration and cold junction compensation (CJC) maintain signal stability across shifting ambient cabinet environments. Programmed firmware flash compatibility ensures accurate interpretation of thermocouple linearized scaling and programmable notch filter parameters across connected process loops.

Frequently Asked Questions

Q: Does the 1769-IT6 module support Removal and Insertion Under Power (RIUP)?

A: No, the 1769-IT6 does not support RIUP functionality. Removing or inserting this module while the CompactLogix backplane power is energized causes system bus disruptions and risks damaging internal circuitry.

Q: How is cold junction compensation handled when wiring thermocouple sensors to the terminal block?

A: The module relies on two dedicated CJC thermistors installed directly on the removable terminal block. These sensors continuously measure ambient terminal temperature to offset cold junction errors automatically across channels 0 through 5.

Field Installation Guidelines

Mount the module directly to a 35 mm DIN rail or secure it to a panel enclosure plate using the integral mounting feet. Turn off all backplane and field loop power before wiring the terminal connections. Route thermocouple extension wire or shielded millivolt cabling away from high-voltage AC lines and variable frequency drive motor leads. Connect cable shields to a single-point chassis ground terminal at the cabinet entry point to prevent common-mode voltage fluctuations from corrupting 16-bit sensor conversions.