CyberCertPrepOT Security FundamentalsOT Fundamentals: Safety Systems & Physical SecurityEASYFree question
A design review assigns SIL 2 to a high level trip on a storage tank. What does that rating express about the function?
- A.The number of sensors wired to the logic solver
- B.The response time allowed from detection to valve motion
- C.The target probability band for failure on demand
- D.The maximum temperature the final element tolerates
Why C is correct
A SIL is a measure of the risk reduction the function must deliver, expressed as a band of the probability of failing when a demand occurs. It is not a temperature limit, a sensor count or a response time, although each of those can be a design input.
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