Priniples of analog value processing
4.6 Wiring thermocouples
S7-300 Automation System Module data
Manual, 08/2006, A5E00105505-04
4-17
Connecting thermocouples via compensating box
If all thermocouples connected to the module's inputs share a common reference junction,
compensate the circuit as follows:
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0
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0
/ 0
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Figure 4-15 Connecting thermocouples to electrically isolated analog inputs via compensation box
Note
To compensate the analog input modules, always use compensation boxes with a reference
junction temperature of 0 °C.
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