1756-IT6I Allen Bradley Rockwell Controllogix Isolated Thermocouple Module

Product Parameters

Basic Information:

Manufacturer: Allen-Bradley (Rockwell Automation)

Model: 1756-IT6I (Series A)

Type: Temperature Sensing Analog Input Module

Compatible Systems: ControlLogix series (compatible with PLC-5 via adapters)

Installation: Occupies one slot in a 1756 ControlLogix chassis, suitable for local or remote I/O configurations

Module Location: Can be installed in any slot of the ControlLogix chassis

Electrical Parameters:

Input Channels: 6 individually isolated thermocouple/mV inputs, plus 1 Cold Junction Compensation (CJC) sensor input

Input Signal Ranges:

Thermocouple: -12 to 78 mV (standard range)

High-Resolution Range: -12 to 30 mV

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

Resolution:

16 bits

1.4 µV/bit (typical) for -12 to 78 mV

0.7 µV/bit for -12 to 30 mV (high-resolution range)

Input Counts:

For -12 to 78 mV: -15.15836 mV (-32768 counts) to 79.241 mV (32767 counts)

For -12 to 30 mV: -15.80323 mV (-32768 counts) to 31.396 mV (32767 counts)

Accuracy:

Local CJC: ±0.3°C to ±3.2°C (depending on thermocouple type)

Remote CJC: ±0.3°C

Backplane Current:

250 mA @ 5.1V DC

125 mA @ 24V DC

Backplane Power: Approximately 4.25 W

Power Dissipation: 4.25 W (maximum)

Thermal Dissipation: 14.48 BTU/hour (maximum)

Isolation Voltage: 250V continuous (channel-to-channel and channel-to-backplane), tested at 1500V AC for 60 seconds (basic insulation)

Input Impedance: >10 MΩ

Connection and Wiring:

Removable Terminal Blocks (RTBs):

1756-TBNH: 20-position NEMA screw clamp block

1756-TBSH: 20-pin spring clamp block

Wire Size:

0.33–2.1 mm² (22–14 AWG) solid or stranded shielded copper wire, rated at 105°C (221°F) or greater, 1.2 mm insulation max

Torque: 1.36 Nm (12 lb-in) for 1756-TBNH

CJC Sensor: Requires one CJC sensor (included with RTB) for accurate thermocouple measurements

Environmental Specifications:

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: 2G @ 10–500 Hz

Shock: 30G (operating), 50G (non-operating)

Enclosure Type: Open-type

Temperature Codes: T4 (North America, IEC, ATEX)

Other:

Conversion Method: Sigma-Delta ADC, monotonicity with no missing codes

Data Formats: Integer (left-justified, 2’s complement), IEEE 32-bit floating point

Dimensions: 421 mm × 326 mm × 112 mm (16.57 in × 12.83 in × 4.41 in)

Certifications: UL, CSA, CE, C-TICK, ATEX, FM, KC, IECEx, ABS

UPC: 612598172313

Functions

Temperature Measurement:

Supports six individually isolated thermocouple inputs for precise temperature measurement, compatible with thermocouple types B, E, J, K, R, S, T, N, C, D, L (TXK/XK).

Also accepts millivolt inputs (-12 to 78 mV or -12 to 30 mV high-resolution range) for non-temperature applications.

High-Resolution Input:

Offers 16-bit resolution with 1.4 µV/bit (standard) or 0.7 µV/bit (high-resolution), ensuring accurate temperature and millivolt measurements.

Individual Channel Isolation:

Each of the six channels is isolated from one another and the backplane, preventing signal interference and enhancing reliability in noisy environments.

Cold Junction Compensation (CJC):

Includes one CJC sensor input for accurate thermocouple measurements, supporting local or remote CJC configurations with ±0.3°C to ±3.2°C accuracy depending on setup.

Diagnostic Features:

Supports real-time sampling, under-range/over-range detection, digital filtering, process alarms, rate alarms, 10-ohm offset, wire-off detection, and sensor type/temperature unit configuration.

Provides fault detection for open circuits or wiring issues.

Flexible Data Handling:

Supports Integer and IEEE 32-bit floating point data formats for compatibility with various control algorithms.

Uses Sigma-Delta ADC for precise signal conversion.

System Integration:

Integrates with ControlLogix controllers via ControlNet, EtherNet/IP, or DeviceNet networks.

Supports local or remote I/O configurations, compatible with Studio 5000 Logix Designer for configuration and diagnostics.

Modular Design:Supports Removal and Insertion Under Power (RIUP) with removable terminal blocks (1756-TBNH, 1756-TBSH), simplifying maintenance and reducing downtime.

Application Scenarios

Industrial Process Control:

Used for precise temperature monitoring in industries like chemical processing, oil and gas, or metallurgy, where thermocouples measure high or low temperatures in reactors, furnaces, or pipelines.

Ideal for applications requiring isolated channels to prevent signal interference in multi-sensor setups.

HVAC Systems:Monitors temperature in heating, ventilation, and air conditioning systems for commercial or industrial facilities, ensuring stable environmental control.

Manufacturing Automation:Supports temperature control in production lines, such as heat treatment processes in automotive or aerospace manufacturing, where accurate thermocouple readings are critical.

Distributed Control Systems:Deployed in distributed I/O setups via ControlNet or EtherNet/IP, enabling centralized monitoring of remote temperature sensors in large-scale facilities like power plants or refineries.

Legacy System Upgrades:Replaces older 1771 series modules (e.g., 1771-NBSC) in PLC-5 systems (via adapters) or serves as a key component in modernizing to ControlLogix platforms, maintaining compatibility with legacy infrastructure.

Harsh Environment Applications:Robust design with vibration (2G) and shock (30G) resistance makes it suitable for demanding environments like mining, marine, or heavy industrial settings.

Advantage Products:

All items are Distributor Ready-stock Genuine Brand-new Supplying, please inform us if the other conditions are needed, Used, Open-box, Refurbished, etc.

Many Available just wait for you, feel free to ask to get better deal!!!

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