Principles of analog value processing
4.6 Wiring and connecting thermocouples
S7-300 Module data
Manual, 06/2017, A5E00105505-AJ
255
Wiring and connecting thermocouples via compensating box
If all thermocouples connected to the module's inputs share a common reference junction,
compensate the circuit as follows:
Figure 4-15 Wiring and 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
.
Recommended compensating box
Use a compensating box with a reference junction. You must order compensating box from
external companies. Contact your Siemens representative or Industry Online Support on the
Internet (
https://support.industry.siemens.com/cs/ww/en/
).
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