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The purpose of this study is the formal verification and volidatioii of a model used for the reconfiguration process of a production system. This process is ensured by o function within the control fromework named mode handling. For the needs of reactivity of this function, a synchronous approach using the formal specification fo'mialism Safe State Machine (SSW is adopted We explain firstly what the required properties are. the ntetliods used to check them ore presented, arid then ne propose the specifications in SSM, which guarantee their verification and their validation. This s t u 4 is moirdy concerned nith safety properties enisuriiig mode coheretire.