1. A safety device for safeguarding a movable, guided movement element against undesired collisions with an object situated on a movement path of the movement element, said device comprising at least two sensors for detecting the object and the movement element and for outputting signals depending on the detection, and an evaluation unit for evaluating signals of the sensors and for generating a switch-off signal on the basis of the evaluation, wherein the evaluation unit acquires from the at least two sensors a currently detected state vector from a set of state vectors which unambiguously comprise all possible combinations of the signals of the sensors, and generates the switch-off signal in the case of predetermined state vectors.