Motorized actuators with stroke display, KNX. Actuator for continuous valve control, fully automatic valve stroke detection, 2 inputs for e.g. window contact, presence detector and 5 LEDs to display the valve stroke, forced positions can be selected, e.g. in the event of a controller failure, valve adapter for common valves included in delivery, key for locking (vandal protection). The device can be programmed via the KNX ETS or KNX easy.