Siemens Simatic S7-300 - Page 252

Analog modules
6.4 Analog input module SM 331; AI 8 x 16 Bit; (6ES7331-7NF10-0AB0)
S7-300 Automation System Module data
6-18 Manual, 08/2006, A5E00105505-04
Wiring: Voltage and current measurement
Connection possible at both ends at channels 0 to channel 7
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0
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9
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6)
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Figure 6-3 Wiring and block diagrams
① Connection for voltage measurement
② Potential compensation
Wiring: 2 and 4-wire measuring transducer
Wiring possible at both ends at channel 0 to channel 7