Statecharts: A visual formalism for complex systems
Science of Computer Programming
Supervisory control of a class of discrete event processes
SIAM Journal on Control and Optimization
Distributed control of production systems
Engineering Applications of Artificial Intelligence
Automated synthesis and composition of taskblocks for control ofmanufacturing systems
IEEE Transactions on Systems, Man, and Cybernetics, Part B: Cybernetics
Confidence estimation of feedback information for logicdiagnosis
Engineering Applications of Artificial Intelligence
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To respond rapidly to the highly volatile market, the reconfigurable manufacturing systems (RMS) have brought forward challenging issues. First of all there is a need to build a formal model of a manufacturing configuration. Second it has to be rather easy to derive the models associated to the manufacturing configuration changes (reconfiguration) from such an initial model. An off-line method of rapid design of an optimal logic control law (configuration) based on Petri net (PN) is presented in this paper. From a controlled system modeling point of view, the main characteristics of the level 1 of the CIM architecture are depicted. Subsequently, the formal tool used in the automated planning field is extended to provide a controlled system model. The concept of operation is structured in order to introduce the behavioral properties of the operations. A four-step method is then proposed to design a logic control law that satisfies several goals: reduction of the lead time, satisfaction of the work orders objectives, minimization of the time cycle. Finally, the proposed design method is illustrated on a manufacturing cell.