1756-IRT8I

The 1756-IRT8I from Allen Bradley is designed as an input module within the ControlLogix series, facilitating accurate thermal readings through its eight inputs. Each input is isolated, enhancing safety and performance. Users can select between different input modes, accommodating both RTD and thermocouple sensors based on their specific requirements. The design also incorporates two cold-junction compensation (CJC) sensors to ensure precise temperature measurements by compensating for junction voltage variations.

This module supports a variety of input ranges: 1 to 500 Ohms, 2 to 1000 Ohms, 4 to 2000 Ohms, 8 to 400 Ohms, or -100 to 100 mV. Such flexibility allows for customized configurations depending on the application demands. At a current draw of 200 mA at 5.1V and 150 mA at 24V, the overall power consumption remains efficient with a total backplane power of 4.6 watts.

The device is built on a sigma-delta conversion method, ensuring high accuracy and reliability for incoming signals. The continuous isolation voltage is rated at 250V, providing additional security in sensitive industrial environments. With a minimal module input scan time of 1 ms, it is capable of fast data processing. Maximum thermal dissipation is noted at 15.7 BTU per hour, indicating how it manages heat during operation, while maximum power dissipation also stands at 4.6 watts.