CyberCertPrepOT Security FundamentalsOT Fundamentals: ICS/SCADA BasicsHARDFree question
A PLC enters a major fault after logic was enlarged and a scan exceeded its configured limit. Which mechanism triggered the fault?
- A.The network heartbeat from the historian
- B.The scan watchdog timer expiring
- C.The battery backup supervisor tripping
- D.The input filter debounce setting
Why B is correct
A watchdog timer monitors that each scan completes within a set time and faults the controller if not. Battery supervision relates to memory retention and debounce affects inputs. A historian heartbeat does not control PLC execution.
Know someone studying for OT Security Fundamentals? Send them this one.