CyberCertPrepOT Security FundamentalsOT Fundamentals: Safety Systems & Physical SecurityMEDIUMFree question
A tank overfill function uses three level transmitters wired to vote 2oo3. What is the main benefit of that voting?
- A.A single transmitter fault trips the process immediately
- B.One failed transmitter neither blinds nor trips the function
- C.Two simultaneous transmitter failures are still tolerated
- D.Calibration is no longer needed on any transmitter
Why B is correct
With 2oo3 voting one bad reading is outvoted by the other two, so the function stays available and does not cause a spurious trip. Two failures defeat it and calibration remains necessary.
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