ALLEN BRADLEY 1769sc-IT6I CompactLogix Thermocouple Module

The ALLEN BRADLEY 1769sc-IT6I, also cataloged as the 1769sc-IT6I Isolated Thermal Input Module, operates as a dedicated hardware component for high-resolution temperature acquisition within CompactLogix and MicroLogix 1500 systems. Designed with 6 individually isolated channels, the module processes millivolt and thermocouple signals across types J, K, T, E, R, B, S, N, C, and L. The unit converts low-level sensor voltages into 16-bit digital values while providing channel-to-channel and field-to-backplane galvanic isolation to suppress common-mode ground loop noise.

Hardware Specifications

Deterministic Network Integration & I/O Density Scaling

The 1769sc-IT6I transfers digitised thermal data across the CompactLogix backplane, scaling input density while maintaining EtherNet/IP deterministic network timing. Configurable software filter settings ranging from 4.17 Hz to 470 Hz allow engineers to balance noise rejection against channel update times between 0.006 sec and 0.244 sec. Comprehensive firmware flash compatibility across Studio 5000 and RSLogix environments ensures seamless profile updates, channel-level Cold Junction Compensation (CJC) processing, and integrated open-circuit fault reporting without interrupting backplane bus communication velocity.

Frequently Asked Questions

Q: Does the 1769sc-IT6I require external cold junction compensation sensors?

A: No, the module incorporates built-in Cold Junction Compensation (CJC) sensors directly at the terminal strip to automatically offset ambient temperature changes across all channels.

Q: Can individual channels be configured for different thermocouple types on the same module?

A: Yes, each of the 6 isolated channels can be independently programmed via RSLogix 5000 or Studio 5000 for distinct thermocouple types or millivolt ranges (+/-50 mV and +/-100 mV).

Field Installation Guidelines

Mount the 1769sc-IT6I directly onto an IEC standard DIN rail or panel surface using the retractable mounting feet, ensuring the bus lever lock engages with adjacent 1769 I/O modules to establish backplane power and signal paths. Verify that the module is placed within its allowable power supply distance rating on the 1769 bank.

Connect thermocouple extension wires using shielded, twisted-pair cables designed for the corresponding sensor alloy. Terminate the overall cable shield at a single ground point on the chassis to prevent stray ground currents, and maintain a physical separation of at least 50 mm between thermocouple field wiring and high-voltage AC power lines.