1756-IT6I2 Allen-Bradley

Series#: AllenBradley

Product Details

1756-IT6I2 – High-Performance Isolated Thermocouple/mV Input Module for Allen-Bradley ControlLogix.
6 individually isolated differential input channels, ideal for harsh industrial environments with ground loops.
Supports B, E, J, K, N, R, S, T thermocouples plus ±50 mV and ±100 mV ranges.
Built-in cold junction compensation (CJC) and open-thermocouple detection for reliable process control.
Direct backplane communication via ControlLogix chassis – no external wiring required for data transfer.
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Specification

The Allen-Bradley 1756-IT6I2 is a high-accuracy, isolated thermocouple/millivolt input module designed for the ControlLogix platform. It provides 6 individually isolated differential input channels, each capable of measuring a wide variety of thermocouple types and low-level DC millivolt signals. The module features 16-bit resolution, per-channel configurability, and robust galvanic isolation (250V continuous) between channels and backplane, making it an excellent choice for applications requiring signal integrity in electrically noisy environments. Typical uses include temperature monitoring in chemical processing, power generation, and metal refining, where ground loops and common-mode voltages are a concern. The module supports full software configuration via RSLogix 5000/Studio 5000, and includes diagnostic features such as open-circuit detection and over-range/under-range alarms.

Specification	Details
Product Type	Isolated Thermocouple/mV Input Module
Series	ControlLogix (1756)
Model	1756-IT6I2
Number of Input Channels	6 (individually isolated differential)
Input Types Supported	Thermocouples: B, E, J, K, N, R, S, T; DC Millivolt: ±50 mV, ±100 mV
Isolation Voltage	250V continuous (channel-to-channel, channel-to-backplane)
Resolution	16-bit (plus sign)
Accuracy (typical)	±0.05% of full scale (at 25°C); ±0.1% over 0-60°C range
Cold Junction Compensation	Internal CJC sensor (per module), or external CJC via software
Open Thermocouple Detection	Yes, per channel (software configurable)
Update Rate	Selectable: 50 ms, 100 ms, 200 ms, 500 ms, 1 s (per channel)
Input Impedance	> 10 MΩ (thermocouple mode); > 1 MΩ (mV mode)
Common Mode Rejection Ratio (CMRR)	120 dB Standard Models 60 Hz (typical)
Normal Mode Rejection Ratio (NMRR)	60 dB Standard Models 60 Hz (typical)
Maximum Input Voltage (overvoltage protection)	±30V DC (continuous, between any two terminals)
Backplane Current Consumption	5V DC: 150 mA; 24V DC: 0 mA (module powered by backplane)
Operating Temperature	0°C to 60°C (32°F to 140°F)
Storage Temperature	-40°C to 85°C (-40°F to 185°F)
Relative Humidity	5% to 95% (non-condensing)
Vibration Resistance	2 g Standard Models 10-500 Hz (per IEC 60068-2-6)
Shock Resistance	30 g (per IEC 60068-2-27)
Certifications	UL, CE, C-Tick, ATEX (Zone 2), Class I Div 2 (when installed in suitable enclosure)
Weight	Approx. 0.45 kg (1.0 lb)
Dimensions (H x W x D)	144 mm x 35 mm x 118 mm (5.67 in x 1.38 in x 4.65 in)
Wiring Style	Removable terminal block (1756-TBCH or 1756-TBSH)
Compatible Chassis	1756-A4, A7, A10, A13, A17, A20 (all ControlLogix chassis)
Configuration Software	RSLogix 5000 / Studio 5000 (version 20 or later recommended)
Status Indicators	OK, Channel Status (per channel), Module Fault
Shipping Weight	Approx. 0.55 kg (1.2 lb) with packaging