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Hi I am curious if any SIS or SIL level PLC programming examples or tutorials exist for the actual implementation of Voting Blocks. I’m specifically referring to Voting Logic in SIS ( 1oo1 1oo2 2oo2 2oo1 2oo3) Voting System used in the process related industries, specific to safety systems. These voting systems would have alternative real time multiple instrument I/O selection from which to select as a result of failure by any one of them.

There needs to be troubleshooting course. That would provide a guided approach to finding an error on a PLC controlled machine and correcting it. Beginning with how to approach and understand large, complex program.