Wiring The Inputs For Channel 15 (Compensation Channel) - Siemens SIMATIC S5 Manual

Operation
3.1.3 Wiring the Input for Channel 15 (Compensation Channel)
A Pt 100 resistance thermometer can be connected to channel 15 using a 3-wire connection.
The Pt 100 can detect the reference junction temperature. The Pt 100 resistance thermometer
must make thermal contact with the terminals used for the transition from thermal wires to
copper wires. The temperature values detected via the thermocouples of channels 0 to 12 are
corrected by the microprocessor using the reference junction temperature and form the actual
values for the process control.
2–22
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IP244
C79000–B8576–C859–02