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Today's plants are equipped with decentralised automation systems. In these plants, industrial communication between the devices is required. Reliable communication standards ensure the exchange of information. To guarantee the correct implementation of the underlying communication standards, the communication interfaces of automation devices have to be checked using conformance and interoperability tests. This paper describes a formalised and continuous development process of a test tool used for conformance tests for safety communication interfaces. The application of this tool implies the test of the PROFIsafe profile for PROFIBUS DP and PROFINET 10.