Click Hardware Configuration on the Standard toolbar.
Click the M91 tab on the left-hand bar.
Click the appropriate M91 model to select it and display the model's I/O options.
Click the Analog Inputs tab.
Click the Type field, then select the desired type of input. The Select Operand and Address box opens.
Enter the desired address and a description for the register.
The thermocouple is now part of the configuration.