Abstract: The scheduling problems of the warehousing system are studied based on hierarchical colored petri nets. A simple and crude description of the entire running process of the syste- m is given at the top level, and the more detailed behaviors are specified at the subpage level including the running processes of the fixed rack storage/retrieval (S/R) subsystem, the rotary rack S/R subsystem, the sorting subsystem and the transporting subsystem. The dynamic behaviors of the entire system are analyzed using CPN?Tools, and the whole scheduling strategy is presented and verified.

Key words: CPN?Tools, Hierarchical colored petri nets, Scheduling, Simulation, Warehousing system