CyberCertPrepOT Security FundamentalsOT Fundamentals: Safety Systems & Physical SecurityMEDIUMFree question
Two redundant pressure transmitters of the same model share one impulse line and one power supply. Which weakness does this create?
- A.A voting mismatch fault flagged by the logic solver on each scan
- B.A common cause failure that defeats the redundancy
- C.A systematic capability shortfall in the logic solver
- D.A diagnostic coverage figure of exactly zero for each channel
Why B is correct
Shared hardware, process connection or power means one event such as a plugged impulse line can disable both channels. This common cause is modeled with a beta factor and is reduced through diversity and physical separation.
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