Abstract: A method using a redundant safety system and a redundant safety system for a mobile machine having at least one controller, having a first localization system for localizing a position of at least one safe point of interest, having a detection system for detecting a feature of the safe point of interest, wherein a position of the safe point of interest can be detected by means of the localization system and a feature of the safe point of interest can be detected by means of the detection system, with a safe zone of interest associated with the safe point of interest being able to be activated by means of the controller on detection of the position of the safe point of interest and of the feature of the safe point of interest.

Abstract: The invention relates to an optoelectronic position detection system for position determination having a positioning scale with position marks and a sensor apparatus with two sensor units each consisting of a light receiver for generating received signals from received light that was reflected by the position marks and each having an evaluation unit for evaluating the received signals and outputting the evaluation results. To provide a position detection system that works more robustly and more reliably and that in particular satisfies the functional safety such as is demanded by the relevant safety standards, it is proposed that the sensor units are configured as identical. The invention further relates to a method for failsafe position determination in which position marks on a positioning scale are detected by an optoelectronic position detection system.