The Allen-Bradley 1756-IRT8I is a high-performance analog input module designed for the ControlLogix platform. This module features eight isolated input channels capable of measuring signals from RTDs, thermocouples, and millivolt sources. Engineered for precision in industrial control environments, it provides reliable data acquisition for temperature-sensitive processes.
Features
Eight isolated input channels for enhanced noise immunity and signal integrity.
Support for a wide variety of thermocouple types including B, C, D, E, J, K, N, R, S, T, and TXK/XK (L).
Data representation using IEEE 32-bit floating point format.
Integrated isolation voltage rating of 250 Volts continuous.
Fast module scan time of 1 ms for responsive process monitoring.
Low power dissipation of 4.6 W to maintain thermal efficiency within the chassis.
Technical Specifications
Model
1756-IRT8I
Input Channels
8 Isolated
Supported Inputs
RTD, Thermocouple, Millivolt
Scan Time
1 ms
Current Draw (5.1V)
200 mA
Current Draw (24V)
150 mA
Max Power Dissipation
4.6 W
Isolation Voltage
250V Continuous
Installation Guidelines
Ensure the ControlLogix chassis is powered down before inserting or removing the module.
Use appropriate shielded cabling for thermocouple and RTD inputs to minimize electromagnetic interference (EMI).
Verify that the module is fully seated in the chassis slot and secured with the top and bottom latching mechanisms.
Maintain adequate airflow around the chassis to prevent exceeding the maximum operating temperature.
Follow proper grounding practices for the backplane and signal shields to ensure accurate measurement performance.
FAQ
What types of sensors can be connected to the 1756-IRT8I?
This module supports various RTD types, multiple thermocouple standards (B, C, D, E, J, K, N, R, S, T, TXK/XK), and millivolt input signals.
Does this module require external power?
The module draws its power directly from the ControlLogix backplane. It requires 200 mA at 5.1V and 150 mA at 24V from the system power supply.
Is the 1756-IRT8I isolated?
Yes, the module features 8 isolated channels with a 250V continuous isolation rating, which helps protect the controller from ground loops and common-mode noise.
