What if? - How Safety Systems differ from Reliable Systems
Developing a SIL4 fault-tolerant safety platform and having it certified by an accredited agency requires a significant effort and investment. There are many ‘what if...?’ questions to be addressed at every stage of development, testing and certification. This paper introduces the relevant functional safety standards and some of the areas for consideration including formal failure analysis, voting, the safety communication layer, common mode failures, safety analysis, variations in the operating environment, and certification.
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