What is an actuator's function in a control system?

The function of an actuator in a control system is to perform actions based on control signals. Actuators are responsible for translating the commands from a controller into physical movement or control of a process. For instance, in a heating system, an actuator may adjust a valve or a heating element's power level to maintain the desired temperature setpoint.

By receiving signals from a control loop, the actuator executes the required action, such as moving a motor, opening or closing a valve, or adjusting a damper. This action is fundamental to the operation of the control system, as it directly influences the variables being controlled, ensuring that the desired setpoint is achieved and maintained.

Other choices relate to different aspects of control systems: measuring output, monitoring performance, and generating feedback loops all play roles in the broader context of system optimization and control but do not specifically define the act of performing actions based on control signals, which is central to an actuator's role.