Analog modules
6.10 Analog input module SM 331; AI 8 x TC; (6ES7331-7PF11-0AB0)
S7-300 Module data
Manual, 06/2017, A5E00105505-AJ
397
Wiring: Thermocouple via reference junction
All 8 inputs are available as measurement channels if thermocouples are wired via reference
junctions which are regulated to 0 °C or 50 °C.
Thermocouple via reference junction
Reference junction regulated to 0 °C or 50 °C
for example, compensation box (per channel) or thermostat
Analog-to-Digital Converter (ADC)
External cold spot comparison
Figure 6-26 Wiring and block diagram
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