General Diagnostic Features
The thermocouple/mV module contains diagnostic features that can
help you identify the source of problems that may occur during
power-up or during normal channel operation. These power-up and
channel diagnostics are explained in chapter 7. Module Diagnostics
and Troubleshooting.
System Overview
The thermocouple module communicates to the SLC 500 processor
through the parallel backplane interface and receives +5V dc and
+24V dc power from the SLC 500 power supply through the
backplane. No external power supply is required. You may install as
many thermocouple modules in your system as the power supply can support.
Each individual channel on the thermocouple module can receive
input signals from thermocouple sensors or mV analog input devices.
You configure each channel to accept either input. When configured
for thermocouple input types, the thermocouple module converts the
analog input voltages into cold-junction compensated and linearized,
digital temperature readings. The 1746-NT4 uses the National Bureau
of Standards (NBS) Monograph 125 and 161 based on IPTS-68 for
thermocouple linearization.
When configured for millivolt analog inputs, the module converts the
analog values directly into digital values. The module assumes that the
mV input signal is already linear.
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