CyberCertPrepOT Security FundamentalsOT Fundamentals: ICS/SCADA BasicsEASYFree question
A control valve positioner receives a 4-20 mA signal and moves the valve stem. In control terms what is the valve?
- A.A sensor measuring the process
- B.A controller computing the setpoint
- C.A supervisory node archiving values
- D.An actuator acting on the process
Why D is correct
Actuators convert a control signal into physical action such as moving a valve or starting a motor. Sensors measure and controllers decide. A supervisory node would only display or archive data.
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