The output signal of a control system is primarily influenced by ______.

The output signal of a control system is primarily influenced by control actions because these actions are the direct response of the system to the control strategy employed to achieve desired system behavior. Control actions involve the adjustments made by the controller based on feedback it receives from the measured output performance in relation to the set point.

These actions could include modifications to the process inputs such as valve positions or changes in actuator settings, which will directly impact how the output behaves. For instance, if the system output is not reaching the desired set point, the control actions would work to correct this by increasing or decreasing inputs to steer the output towards the set point.

In contrast, set point adjustments may change the target the system is trying to achieve, but they don't influence the output directly on their own; they require the control actions to enact any change. Disturbances are external influences that can affect the process, but the system’s control actions determine how effectively these disturbances are managed. Measurement errors can impact the data being used to make control decisions, but again, it is the control actions that ultimately determine the output signal of the system.