Simplification of a Petri Net Controller in Industrial Systems
|International Journal of Industrial Engineering|
|© 2015 by SSRG - IJIE Journal|
|Volume 2 Issue 1|
|Year of Publication : 2015|
|Authors : R.Sunther|
R.Sunther, "Simplification of a Petri Net Controller in Industrial Systems" SSRG International Journal of Industrial Engineering 2.1 (2015): 4-7.
R.Sunther,(2017). Simplification of a Petri Net Controller in Industrial Systems. SSRG International Journal of Industrial Engineering 2(1), 4-7.
This paper deals with the problem of prohibited states in discrete event systems modeled by Petri Net. To circumvent the forbidden states, some constraints which are called Generalized Mutual Exclusion Constraints can be assigned to them. Enforcing these constraints on the system can be performed using control places. Though when an amount of these constraints is large, a large number of control places must be associated to the system which complicates the model of controller. In this paper, the objective is to propose a general method for dropping the number of the mentioned constraints and therefore the number of control places. This method is based on combining some constraints for obtaining a constraint verifying all of them which is performed using the optimization algorithms. The obtained controller after reducing the number of the control places is maximally tolerant.
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Supervisory Control Theory, Petri Net (PN), Generalized Mutual Exclusion constraint (GMEC), Flexible Manufacturing System (FMS).