Several failsafe digital signals shall be monitored and failsave actuators shall be controlled 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 digital input modules and/or in the CPU. The various possibilities of wiring and voting failsafe signals are illustrated in this Functional Example. Additional the wiring and voting of failsafe outputs are illustrated too.
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