It’s all about the safety PLC—not!
Focus on the big safety improvements and the real problems. This fundamental concept applies to many tasks in addition to functional safety.
This week I was asked to join a debate about functional
safety. The argument was based on a paper that criticized the
accuracy of the Markov model used to calculate failure
probability of a safety integrity level (SIL) 3 certified
safety programmable logic controller (PLC). I was drawn into
the argument. While reading the paper, I concluded that this
paper could be right. Even though the argument was against the
model that I had made some time ago.
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