Analog modules
6.7 Analog input module SM 331; AI 8 x 12 bit;(6ES7331-7KF02-0AB0)
S7-300 Module data
Manual, 06/2017, A5E00105505-AJ
357
Wiring: Thermocouples with external compensation
Insert a bridge between Comp+ and M
ANA
when using the internal compensation.
Figure 6-16 Block diagram and wiring diagram