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This paper introduces extensions in an Object Coloured Petri 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 real-time database objects. The semantical constraints can be mapped to Petri net constructions. An example based on a manufacturing cell is shown.