Final answer:
True, a setpoint is required for controllers to perform their control functions effectively, serving as the desired value for the system to maintain.
Step-by-step explanation:
True, all controllers must have a setpoint to be able to provide a control function. The setpoint is an essential component of a feedback control system. It serves as the target or desired value that the system is aiming to maintain for a particular variable. In such systems, the stimulus provided by the variable being regulated indicates if the variable's value has deviated from the setpoint. If the sensor detects a discrepancy between the actual value and the setpoint, it transmits this data to the control center.
The control center then processes the information, comparing the actual value against normal values or the setpoint. In response to any deviations, the control center initiates corrective measures to bring the variable back to the setpoint or within normal operating ranges. This is how controllers manage to maintain the desired state of the variable they regulate, such as temperature, pressure, or speed.