Patent ID: 9103931
Filing Date: 2015-08-11
Classification: G01V

Abstract:
1. A light curtain for monitoring a protective field, said light curtain comprising: at least one first optical unit having a plurality of light emitting elements and light receiving elements and at least one second optical unit having a plurality of light emitting elements and light receiving elements, wherein said light emitting elements of each optical unit are operable to form a plurality of light barriers with opposing light receiving elements of the respective other optical unit, a control unit for processing output signals generated by said light receiving element and for generating a defined output signal upon interruption of at least one light barrier, wherein said first and second optical unit each comprise a transceiver unit carrying said plurality of light emitting elements and light receiving elements, said first and second transceiver units having an identical structure, and wherein each optical unit has at least one separately housed, detachable plug-in module, said first and second plug-in modules differing regarding their functionality and terminals from each other and defining the functionality of the first optical unit and the second optical unit, respectively.