Dear Dan
You are correct, an IEC 61508 SIL is a property of an overall safety-related
function or system.
It cannot be applied to a constituent part.
However, IEC 61508 gives you a list of the things that you need to provide
safety-related systems designers with, so that they can decide how to
A customer called this week and asked what our SIL rating is on one of our
products (Programmable Logic Controller). I had never heard of a SIL
rating. I went to the web and discovered SIL stands for Safety Integrity
Level and is addressed in IEC61508. My impression, from the web search, is
tha
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