1756-IT6I2 | Allen-Bradley Isolated Thermocouple/mV Input Module (6-Channel, ControlLogix)

The 1756-IT6I2 is a high-precision analog input module designed to measure temperature and millivolt signals using thermocouples. It is part of the ControlLogix system and offers six isolated input channels. Each channel is capable of independently reading analog signals from various thermocouple types or raw millivolt sources. The module then linearizes these inputs and converts them into temperature values in Celsius or Fahrenheit. This makes it ideal for industrial applications where accurate thermal monitoring and control are critical.

The 1756-IT6I2 supports a wide range of thermocouple types, including B, C, D, E, J, K, L, N, R, S, and T. This extensive compatibility allows the module to be deployed across various industries and temperature ranges. Each thermocouple type is suited for specific applications—for example, Type K for general industrial use or Type R/S for high-temperature environments like furnaces. The module automatically linearizes the input signals based on the thermocouple type selected. This flexibility ensures accurate temperature readings tailored to specific operational needs.

The module includes two integrated Cold-Junction Compensation (CJC) sensors. These sensors monitor the ambient temperature at the terminal blocks where thermocouples connect. The CJC readings are automatically used to correct the thermocouple measurements, improving accuracy. This eliminates the need for external compensation circuitry and simplifies installation. Reliable CJC functionality ensures accurate temperature readings even in fluctuating ambient conditions.

The 1756-IT6I2 supports the use of 1756-TBNH and 1756-TBSH removable terminal blocks (RTBs). These terminal blocks allow for easy wiring and fast replacement or maintenance of the module without disturbing existing field wiring. The RTBs provide secure and reliable connections to thermocouples and other signal lines. They also help reduce system downtime during installation or troubleshooting. Choosing the correct RTB is essential for ensuring compatibility and mechanical stability.

The 1756-IT6I2 offers scan times of 25 milliseconds for floating-point millivolt readings, 50 milliseconds for temperature readings, and 10 milliseconds for integer millivolt data. These fast response times ensure that the module can keep up with dynamic changes in the measured environment. Rapid scan rates help in maintaining tight process control loops where temperature shifts need to be corrected promptly. This performance supports real-time monitoring, particularly in high-speed production environments. The scan time can be configured to match the process demands for optimized control.