Wiring and Voting Architectures for failsafe Digital Input (F-DI) and Output Modules (F-DO) of the ET 200M
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 application example. Additional the wiring and voting of failsafe outputs are illustrated too.
- One sensor (1oo1)
- Two sensors (1oo2) – voting in the F-DI
- Two sensors (1oo2) – voting in the user program
- Control of actuators