1756-IRT8I Allen Bradley Rockwell ControlLogix RTD Module

Product parameters

Product Model: 1756-IRT8I

Type: Isolated RTD/ Thermocouple/Millivolt input Module (Analog Input)

Input points: 8 independent isolated channels, supporting RTD, thermocouple and millivolt input

Linearization standard: ITS-90

Millivolt input range: -100... 100 mV

Millivolts: 0.014 µV/bit

Input impedance: >10 MΩ

Power dissipation: Maximum 4.6W

Heat dissipation: 15.7 BTU/hr

Conversion method: Sigma-Delta

Data format: IEEE 32-bit floating-point number

Scanning time:

Minimum 1 ms (single-channel, thermocouple mode, no filtering)

Up to 488 ms (8 channels, 10 Hz notch filtering)

Isolation voltage:

Channel-to-channel: 250V (continuous), basic insulation, test voltage 1350V AC, lasting for 2 seconds

Channel to backplane: 250V (continuous), enhanced insulation, test voltage 1350V AC, lasting for 2 seconds

Cold Contact Compensation (CJC) :

Two CJC sensors (ordered separately, part number 1756-CJC)

CJC accuracy: ±0.3°C (local and remote CJC)

Open-circuit detection time:

Thermocouple input: 2 seconds

Three-wire RTD: 2 seconds

4-wire RTD: 5 seconds (If INx/RTD C and INx/RTD D are disconnected simultaneously, there is no open circuit detection)

Noise suppression

Normal mode: 75 dB @ 60 Hz

Common mode: 125 dB @ 60 Hz (1000 Ω differential), 120 dB @ 50 Hz (1000 Ω differential), 160 dB @ 600 V (100 Ω differential)

Overvoltage protection: ±30V DC

Wire size:

1756-TBCH/TBS6H: 0.33-2.1 mm² (22-14 AWG, single line), 0.33-1.3 mm² (22-16 AWG, double line)

Connector: 36-pin removable terminal block (RTB, such as 1756-TBCH or 1756-TBS6H)

Operating temperature range: 0-60°C (32-140°F)

Storage temperature range: -40 to 85°C (-40 to 185°F)

Working humidity: 5-95% (no condensation)

Impact rating: 30G

Vibration level: 2G @ 10-500 Hz

Installation method: Install on ControlLogix racks (compatible with 1756-A4, A7, A10, A13, A17)

Certifications: CE, CSA, UL, FM, IECEx, ATEX, RCM, KC, EAC (As of March 17, 2025, specific certifications are subject to the product label)

Temperature code: T4 (North American and ATEX standards)

Shell type: Open Enclosure

UPC: 885630245423

Function

Multi-functional input

Supports RTD (3-wire and 4-wire), thermocouple and millivolt input. Each channel can be independently configured for different sensor types, offering high flexibility.

The 24-bit resolution offers ultra-high precision and is suitable for precise temperature and resistance measurement.

Channel isolation

All 8 channels are independently isolated (channel-to-channel, channel-to-backplane, 250V), effectively reducing ground loops and electromagnetic noise interference, and enhancing signal integrity.

Advanced diagnostic functions:

Supports open-circuit detection (2-5 seconds, depending on the input type), over-range/under-range detection, process alarm, rate alarm and sensor offset.

Provide 10 Ω copper RTD offset compensation to optimize the measurement accuracy at low temperatures.

Supports cold contact compensation (CJC). In thermocouple mode, the 1756-CJC sensor needs to be ordered separately.

Flexible data processing

Supports IEEE 32-bit floating-point data format and is compatible with multiple control systems.

It offers multiple input ranges (1-500 Ω, 2-1000 Ω, 4-2000 Ω, 8-4000 Ω, -100...) It is 100 mV and supports the selection of temperature units (Celsius/Fahrenheit).

It is equipped with built-in digital filtering, notch filtering (10 Hz, 50 Hz, 60 Hz, 100 Hz, 250 Hz, 1000 Hz) and synchronous sampling function.

Network integration

Communicate with the ControlLogix controller via ControlNet or EtherNet/IP network, supporting local or distributed I/O architecture.

Supports hot plugging (RIUP), which is convenient for maintenance and replacement.

Calibration and Self-diagnosis

In thermocouple mode, self-calibration of lead resistance is supported (performed when the module is powered on and cycled).

Factory pre-calibration, supporting re-calibration by channel to ensure long-term accuracy.

Application scenarios

Process control

In the petrochemical, oil refining, pharmaceutical or food processing industries, it is used to monitor key temperature parameters such as the temperature of reactors, storage tanks or pipelines.

Channel isolation and high precision (24-bit) are suitable for complex electromagnetic environments and high reliability requirements.

Industrial Automation

It is used for temperature monitoring in manufacturing industries, such as heat treatment furnaces, injection molding machines or metal processing equipment.

Supports multiple RTD and thermocouple types to meet the requirements of different sensors.

Data Acquisition System

In laboratories or test platforms, high-precision temperature or millivolt data can be collected, which is suitable for scientific research, quality control or environmental monitoring.

The synchronous sampling and timestamp functions support sequential event (SOE) applications.

Distributed control system: Through ControlNet or EtherNet/IP networks, it serves as a remote I/O component and is integrated into large-scale factory automation systems, suitable for cross-regional temperature monitoring.

High-reliability scenarios: Channel isolation, CJC compensation and diagnostic functions make it suitable for temperature monitoring in power systems, aerospace or critical infrastructure.

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!!!

Bou L(Sales Manager)            

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Tina(Sales Specialist)       

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Doris(Sales Specialist)       

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