A device receiving a process variable (PV) signal from a primary sensing element (PSE) or transmitter, comparing that signal to the desired value (called the setpoint) for that process variable, and calculating an appropriate output signal value to be sent to a final control element (FCE) such as an electric motor or control valve.
Similar Basic Questions in Industrial and Control Systems Engineering:
- What is Manual mode in Industrial measurement and control systems Engineering
- What do you mean by Automatic Mode in Industrial measurement and control systems Engineering
- What is FCE or Final Control Element
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- What is Process Variable in Industrial measurement and control systems
- What is Setpoint in Industrial measurement and control systems
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Reference and Further Reading: Basics of Industrial Instrumentation Handbook