This paper introduces extensions in an Object ColouredPetri Net model named G-CPN to model a real-time control and database system. These extensions allow the designer to apply an unified approach to model the control objects and the database objects of a real-time system. Syntactic and semantical constraints are considered for realtime database objects. The semantical constraints can be mapped to Petri net constructions. An example based on a manufacturing cell is shown.
When specifying, designing and analyzing complex real-time systems, it is necessary to adopt a modular or compositional methodology. This methodology shall allow the designer the ability to verify local properties of individual modules or components in the system, and also shall allow the verification of the correct behavior of interacting components. The application of Petri nets for the modeling and verification of systems, at specification and design levels are well known. Despite the powerful structuring mechanisms available in the Petri nets theory for the construction of the model of complex systems, the designer is still likely to face the problem of state explosion, when analyzing and verifying large systems. In this work we introduce a modular analysis methodology for a kind of high level Petri nets named G-Nets.
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