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National audienceConformance test is a formal method that is aiming at checking whether an implementation, a Programmable Logic Controller (PLC) in this study, behaves as described by its specication. This method requires naturally a formal model of the specication. This paper shows how such a model can be built from a non-formal model in the IEC 60848 standardized language and the knowledge of the execution mode of this model by the PLC. Application to a simple example highlights the signicance of the consideration of the execution mode for conformance test

Formal models for conformance test of programmable logic controllers