Allen-Bradley 1756-IRT8I ControlLogix analog input module

The Allen-Bradley 1756-IRT8I is a ControlLogix analog input module with Eight (8) channels configurable for Resistance Temperature Detector (RTD), Thermocouple and millivolt input.

This module features high resolution analog to digital conversion via Sigma-Delta method. The converted data is saved to IEEE 32-bit floating point. The converted data are ideally accessed by Human Machine Interface (HMI), Supervisory Control and Data Acquisition (SCADA) and Distributed Control Systems (DCS). Other than computer-based systems, the signal data may be used for calculations, and Process Variables (PV) for controllers such as Proportional + Integral + Derivative (PID).

Technical specifications for 1756-IRT8I

ManufacturerRockwell Automation

BrandAllen-Bradley

Part Number/Catalog No.1756-IRT8I

SeriesControlLogix

Module TypeAnalog RTD / Thermocouple / milivolt Module

Inputs8 Isolated Channels

No. of InputsEight (8) Point Isolated RTD / Thermocouple / milivolt

Current Draw (5.1 Volts)200 milliamps

Compatible RTD Type100, 200, 500, 1000 ? Platinum, alpha=385 100, 200, 500, 1000 ? Platinum, alpha=3916 120 ? Nickel, alpha=672 100, 120, 200, 500 ? Nickel, alpha=618 10 ? Copper, alpha=427

Current Draw (24 Volts)150 milliamps

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

Power Dissipation (Maximum)4.6 Watts

Resolution24 bits 0…510 ?: 0.06 m?/count 0…1020 ?: 0.12 m?/count 0…2040 ?: 0.25 m?/count 0…4080 : 0.50 m /count -101…101 mV: 0.01 ?V/count

Thermal Dissipation15.7 BTU per hour

Input Range1…500 ? 2…1000 ? 4…2000 ? 8…4000 ? -100…100 mV

Isolation Voltage250 Volts Continuous

Module Scan Time1 ms

Backplane Current at 24 Volts2 milliamps

Data FormatIEEE 32-bit floating point

Backplane Current (5Volts)250 mA

UPC10885630245420

Backplane Current (24 Volts)150 mA

Power Dissipation (Max)4.6 W

This module is capable of Open Circuit Detection with detection time of 2 Seconds for Thermocouple input and 3-Wire RTD and 5 Seconds for 4-Wire RTD.

Supported input range of this module are 1 - 500 ?, 2 - 1000 ?, 4 - 2000 ?, 8 - 4000 ? and -100 to 100 mV. The modules overall resolution is 24 Bits. With actual resolution of 0…510 ?: 0.06 m?/count 0…1020 ?: 0.12 m?/count 0…2040 ?: 0.25 m?/count 0…4080 ?: 0.50 m?/count -101…101 mV: 0.01 ?V/count.

Supported Thermocouple types include Thermocouple Type B, C, D, E, J, K, N, R, S, T, TXK/XK (L) with linearization of ITS-90. Compatible RTD sensors include 100 ? PT 385, 20 ? PT 385, 500 ? PT 385, 1000 ? PT 385, 100 ? PT 3916, 20 ? PT 3916, 500 ? PT 3916, 1000 ? PT 3916, 10 ? CU 427, 120 ? NI 672, 100 ? NI 618, 120 ? NI 618, 200 ? NI 618 and 200 ? NI 618. Compatible millivolt signals should be within the range of -100 to 100 mV.

1756-IRT8I

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