Siemens Simatic S7-300 - Page 193

Priniples of analog value processing
4.6 Wiring thermocouples
S7-300 Automation System Module data
Manual, 08/2006, A5E00105505-04
4-19
Connecting to the reference junction (order no. M72166-xxx00)
If all thermocouples connected to the module's inputs share a common reference junction,
compensate the circuit as follows:
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Figure 4-16 Connecting thermocouples to the reference junction (order no. M72166-xxx00)