CyberCertPrepOT Security FundamentalsOT Fundamentals: Safety Systems & Physical SecurityMEDIUMFree question
A plant converts an SIF from 2oo2 to 1oo2 sensor voting. What is the effect on the function?
- A.Safety improves while spurious trips become more likely
- B.Spurious trips fall while the chance of missing a demand rises
- C.Spurious trips plus missed demands both become less likely
- D.Trip behavior is unchanged with voting set on the HMI
Why A is correct
One out of two voting trips when either sensor sees the hazard, which lowers the chance of missing a demand but raises nuisance trips. Two out of two does the opposite. Voting is fixed in the logic solver not the HMI.
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