Siemens Simatic S7-300 - Page 273

Analog modules
6.6 Analog input module SM 331; AI 8 x 13 Bit;(6ES7331-1KF01-0AB0)
S7-300 Automation System Module data
Manual, 08/2006, A5E00105505-04
6-39
Wiring: Voltage measurement
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9
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Figure 6-10 Block diagram and wiring diagram
① Voltage measurement (± 5V, 10V, 1...5V, 0...10V)
② Voltage measurement (± 50 mV, ± 500 mV, ± 1 V)
③ Potential compensation
④ Internal supply
⑤ + 5V from backplane bus
⑥ Logic and backplane bus interface
⑦ Electrical isolation
⑧ Multiplexer
⑨ Analog to Digital Converter (ADC)
⑩ Source of current