CyberCertPrepOT Security FundamentalsOT Fundamentals: Security Standards OverviewEASYFree question
In functional safety, a Safety Integrity Level (SIL) expresses the required risk reduction of a safety function. Which SIL represents the highest level of risk reduction in the IEC 61508/61511 scale?
- A.SIL 1
- B.SIL 4
- C.SIL 3
- D.SIL 2
Why B is correct
The SIL scale runs from SIL 1 (lowest risk reduction) to SIL 4 (highest). Each level corresponds to a target probability of failure on demand; SIL 4 demands the greatest reduction and is rarely required in the process industries, where SIL 1 to SIL 3 are most common.
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