Description
The Allen-Bradley 1756-IRT8I is a high-performance isolated input module designed for the ControlLogix platform. This module provides eight channels capable of measuring signals from RTDs, thermocouples, and millivolt sources, making it a versatile solution for precise temperature monitoring in industrial automation environments.
Features
- Eight isolated input channels for enhanced noise immunity and signal integrity.
- Supports a wide range of thermocouple types including B, C, D, E, J, K, N, R, S, T, and TXK/XK (L).
- Data representation in IEEE 32-bit floating point format for high-resolution processing.
- Fast module scan time of 1 ms to support time-critical control applications.
- Integrated isolation rated at 250 Volts continuous.
Technical Specifications
| Module Type |
Isolated RTD/Thermocouple Input |
| Input Channels |
8 Isolated |
| Backplane Current (5.1V) |
200 mA |
| Backplane Current (24V) |
150 mA |
| Max Power Dissipation |
4.6 W |
| Data Format |
IEEE 32-bit Floating Point |
| Isolation Voltage |
250V Continuous |
Installation Guidelines
- Ensure the ControlLogix chassis is powered down before inserting or removing the 1756-IRT8I module to prevent damage to the backplane or module circuitry.
- Use appropriate shielded cabling for all thermocouple and RTD inputs to minimize electromagnetic interference (EMI) in high-noise industrial settings.
- Maintain proper grounding practices for the chassis to ensure effective noise shielding.
- Verify that the module is fully seated in the chassis slot and that the retaining screws are tightened to secure the connection.
- Ensure adequate ventilation in the cabinet to manage the 4.6W maximum heat dissipation.
FAQ
What types of sensors can be connected to the 1756-IRT8I?
This module supports various RTDs, multiple thermocouple types (B, C, D, E, J, K, N, R, S, T, and L), and millivolt input signals.
Does this module require external power for the inputs?
The module draws its required power from the ControlLogix backplane. Refer to the current draw specifications (200mA at 5.1V and 150mA at 24V) when calculating total chassis power supply loading.
