Controller Design of Petri Net for OR-logics Linear Constraints

A detailed analysis of supervisory control for Petri net based discrete event system with uncontrollable transitions, especially important, for OR-logics linear constraint, a new method for constructing a Petri net feedback controller based on monitor and inhibitor arcs is presented. Constraints are classified into admissible and inadmissible constraints. After Matrix-Transformation, if the constraint is OR-logics linear constraint, then construct monitor and inhibitor arcs to control the Petri net model. The method eases the design of controller and holds remarkable advantages especially for systems with large scale, because it only considers local incident matrix related to the constrained places and unconstrained places related to uncontrollable transitions. Finally, the method is proved to be simple and efficient through an example.