Apparatus for controlling and monitoring actuators with an open/close characteristic

In an apparatus for controlling and monitoring actuators with an open/close characteristic, said apparatus comprising a drive switch unit for operating a drive force unit, at least one limit signal generator that detects an end position, and equipment for operating the drive switch unit and for outputting the limit signal generator states, the improvements comprising a first unit comprising the drive switch unit, the limit signal generator and, in addition, an electronic unit;

• and a second unit comprising an apparatus for providing a drive signal for the drive switch unit and for outputting the limit signal generator states and the electronic unit of said first unit being connected to the second unit by means of a twin-core cable, said twin-core cable transmitting analog signals during operation, the electronic unit of the first unit produces a corresponding control signal for the drive switch unit from the drive signal of the second unit received on the twin-core cable and the electronic unit changes a controllable current source or an interior resistance in dependence on the state of the limit signal generator.