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It’s all about the safety PLC—not!

02.01.2013  |  Goble, W.,  exida LLC, Sellersville, Pennsylvania

Focus on the big safety improvements and the real problems. This fundamental concept applies to many tasks in addition to functional safety.

Keywords: [safety] [SIL] [PLC] [models] [logic controller] [controller] [APC]

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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