Analog modules
6.6 Analog input module SM 331; AI 8 x 13 Bit; (6ES7331-1KF02-0AB0)
S7-300 Module data
342 Manual, 06/2017, A5E00105505-AJ
Wiring: 2-wire and 4-wire transducers for current measurement
4-wire transducer (0/4 mA to 20 mA or ± 20 mA)
2-wire transducer (4 mA to 20 mA)
Logic and backplane bus interface
Analog to Digital Converter (ADC)
Figure 6-11 Block diagram and wiring diagram