Product line system modeling of the cold-rolled mill based on the hierarchy colored petri nets

To deal with various problems in production planning and scheduling system in cold rolling production, and meet the need of abilities in the description and analysis, a method based on the hierarchy colored Petri nets was proposed. According to this method, a simple and crude description of the entire running process of the system is given at the main nets, and the more detailed behaviors are specified at the sub nets. Meanwhile strengthened the Petri nets description ability with coloring, what made steel information, equipment condition and routes clearer, thus simplified the Petri nets model structure, reduced the model complexity. This method also could be well used in other complicated process industries. It was shown that these designed object classes were highly consistent with real production and the development efficiency for production planning and scheduling systems has been greatly improved.