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In this paper, the current situation of how PLC software is tested in industry is analyzed and the challenges on new testing approaches are identified using real industry code and a survey conducted within industry. The different possible and most relevant faults that may occur and must be dealt with are identified and requirements for testing approaches concerning component failures are derived. Further on, an approach to generate tests for error handling routines, which test the reliabilitydoi:10.3182/20140824-6-za-1003.01238 fatcat:zcyfmqbtybg4rjx7gwrlywer6a