Principles of analog value processing
4.6 Wiring and connecting thermocouples
S7-300 Module data
Manual, 06/2017, A5E00105505-AJ
253
4.6.1 Wiring and connecting thermocouples with internal compensation
Function principle of internal compensation
Internal compensation allows you to form the reference point at the terminals of the analog
input module. In this case, route the compensating lines directly to the analog module. The
internal temperature sensor measures the module's temperature and returns a
compensation voltage.
Note that internal compensation is not as accurate as external compensation.
Wiring and connecting thermocouples with internal compensation
Wire the thermocouples either directly to the inputs of the module, or indirectly via
compensating lines. Each channel group can use any type of thermocouple supported by the
analog module, independently of other channel groups.
Figure 4-14 Wiring and connecting thermocouples with internal compensation to electrically isolated
analog inputs
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