C,  Controls

Closed-Loop Control

The control action from a controller dependent on the desired and actual process variable. A closed-loop controller uses a feedback loop to ensure the controller exerts a control action to control a process variable at the same value as the setpoint.

(Example: A boiler control system that uses a thermostat to monitor the building temperature and feeds back a signal to ensure the controller output maintains the building temperature to that set on the thermostat.)

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