Element in a in which the signal of the correcting variable is formed at the output from the controller output signal at the input This is used to modulate the subsequent .
The regulator is omitted if the control output signal can be used to directly modulate the control element. In this case, the controller output signal and the corrective signal are identical.
If the control element is actuated mechanically, it is adjusted by an actuator. In this case, the regulator controls the actuator (DIN 19 226).