Siemens SIMATIC S7-400H - SM 431; AI 16 X 16 Bit, 6 ES7 431-7 QH00-0 AB0

Connection examples for redundant I/Os
E.33 SM 431; AI 16 x 16 Bit, 6ES7 431–7QH00–0AB0
S7-400H
494 System Manual, 03/2012, A5E00267695-11
E.33 SM 431; AI 16 x 16 Bit, 6ES7 431–7QH00–0AB0
The diagram below shows the connection of a sensor to two SM 431;
AI 16 x 16 Bit. Suitable Zener diode: BZX85C6v2.
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Figure E-34 Example of an interconnection with SM 431; AI 16 x 16 Bit