CyberCertPrepOT Security FundamentalsOT Fundamentals: ICS/SCADA BasicsEASYFree question
A new engineer confuses the process variable and the manipulated variable. In a flow control loop adjusting a valve to hold a target flow, the manipulated variable is the:
- A.Historian retention period, which detects process-variable manipulation from network metadata alone
- B.Measured flow rate
- C.Operator-entered setpoint
- D.Valve position output sent to the actuator
Why D is correct
The manipulated variable is the output the controller adjusts, here the valve position, to influence the process. The process variable is the measured flow, and the setpoint is the desired target.
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