Entry type: Application example Entry ID: 24690377, Entry date: 09/08/2017
Wiring and Voting Architectures for failsafe Analog Input Modules (F-AI) of the ET 200M
Several analog signals shall be monitored failsafe in a plant. Depending on importance and failure risk, there are several options of wiring and voting the signals.
The voting can, for example, be realized in the analog input modules and/or in the CPU. The various possibilities of wiring and voting failsafe signals are illustrated in this application example.
- One sensor (1oo1)
- Two sensors (1oo2) – voting in the F-AI
- Two sensors (1oo2) – voting in the user program
- Three sensors (2oo3) – voting in the user program
Improved wording and expansion
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