4
SLC 500 Thermocouple/mV Analog Input Module
Publication 1746-5.23
Module Overview
The module communicates with the SLC 500 processor and re5V dc and
+24V dc power from the system power supply through the parallel backplane
interface. No external power supply is required. You may install as many
thermocouple modules in the system as the power supply can support.
Each module channel can receive input signals from a thermocouple or a
millivolt analog input device. You configure each channel to accept either one.
The module converts analog input voltages when it is configured for
thermocouple input types. The analog input voltages are converted into cold-
junction compensated, digital temperature readings. The module uses the
National Institute of Standards and Technology (NIST) based on ITS-90 for
thermocouple linearization.
When configured for millivolt analog inputs, the module converts analog values
directly into digital counts. The module assumes that the mV input signal is
linear prior to input to the module.
