Research And Implemetation Of FMS Scheduling Based On Petri Nets

FMS logistic scheduling system affects directly performance of FMS, therefore, that researching control method of FMS logistic scheduling system in order to improve logistic scheduling process efficiency of the system will play a very important role in achieving whole FMS coordinated running and improving total performance.In this paper, a model based on object-oriented technology and colored Petri-net theory for FMS logistics system is established to study the control of FMS scheduling logistics. When modeling, the colored Petri-net method using object-oriented technology will be introduced into establishing the model of FMS, which is consisted of parts, machine tools, AGV and warehouse object. Auto three-dimensional warehouse is introduced into the model, so it is a integrated FMS logistics system model that include machining system, transportation system and storage system. Because of using object-oriented technology,the model possess good extensibility and good transplant ability characteristic. This paper focused on an analysis of the firing principle and controlling methods of controlled transitions in this model.In order to realize the model with software, a mapping idea is presented to convert FMS logistics system Petri-nets model into logistics system control program. A method that places mapping program data, transitions mapping program functions and the system Petri subnets model mapping FMS basic class in program is used in this paper. The degree of difficulty is greatly decreased by using this method during analyzing how to design Controlling and Managing Software of FMS, and it is not only simple and easier to realized, but also the software program show a good agreement with the model.Hypothesis data is used as original data of FMS63 Controlling and Managing Software running, FMS logistics system is tested. Hypothesis data has the better identification effect for system model and program, the model and FMS Controlling and Managing Software is proved to be right and effective by testing and analyzing the result of test. Use this Controlling and Managing Software of FMS on FMS63 Flexible Production Line produced by Jiangsu Xinrui Machinery Co., Ltd. And practice in the production of further testing to amend it.