Product Overview

The Allen-Bradley 1756-IT6I2 is a high-precision, individually isolated thermocouple input module designed for the ControlLogix platform. This module provides six independent channels for temperature sensing, supporting a wide array of thermocouple types including B, C, D, E, J, K, L, N, R, S, and T. By utilizing individual isolation, the 1756-IT6I2 eliminates ground loop interference and ensures signal integrity in electrically noisy industrial environments.

Engineered for seamless integration into 1756 ControlLogix chassis, the module features advanced onboard processing for ITS-90 linearization and cold junction compensation (CJC). It is an ideal solution for critical thermal monitoring applications where accuracy, channel-to-channel isolation, and high-resolution data acquisition are required.

Technical Specifications

• Input Channels: 6 Isolated Thermocouple channels plus 2 CJC sensors

• Resolution: 16-bit

• Thermocouple Types: B, C, D, E, J, K, L (TXK/XK), N, R, S, T

• Input Voltage Ranges: -12 to 30 mV; -12 to 78 mV

• Input Impedance: > 10 MOhms

• Overvoltage Protection: 120V AC/DC (continuous)

• Data Formats: Integer Mode; Floating Point (IEEE 754)

• Sample Rate: Real-time sampling with configurable RPI

• Noise Rejection: 60 dB Normal Mode; 160 dB Common Mode

• Power Consumption: 1.5W @ 5.1V DC; 2.5W @ 24V DC

• Weight: 0.28 kg (0.62 lbs)

• Dimensions: 3.5 x 14 x 14.5 cm

Key Functional Characteristics

• Individual Channel Isolation: Each of the six inputs is electrically isolated from others and the backplane, providing superior protection against common-mode noise and ground loops.

• Advanced Diagnostics: Includes comprehensive status reporting for open-circuit detection, under-range/over-range alarms, and rate-of-change alerts.

• Digital Filtering: Built-in notch filtering and programmable low-pass filters allow users to suppress environmental interference for stable readings.

• Dynamic Configuration: Supports "On-the-Fly" configuration changes through the Logix Designer application without stopping the processor.

• Hardware Compatibility: Requires a 1756-TBNH or 1756-TBSH Removable Terminal Block (RTB) for field-side wiring connections.