Modelling and Control of Flexible Manufacturing Systems by Means of Interpreted Petri Nets

摘要

Because .exible manufacturing systems (FMS) are dis- crete event systems (DES), their modelling and control by means of Petri nets (PN) is widely used. While PN tran- si.ons are observable and controllable and PN places are measurable, place/transi.on PN (P/T PN) are su.- cient for this aim. .owever, when some PN transi.ons are unobservable and/or uncontrollable and some pla- ces are non-measurable/unobservable, P/T PN are insuf- ficient for modelling and especially for control. In such a case interpreted Petri nets (IPN) seem to be an appropri- ate replacement for P/T PN. In this paper a possibility of usage of IPN for FMS modelling and control is pointed out. Illustra.ve examples as well as the case study on a robo..ed assembly cell are introduced. By means of using .med PN (TPN) also the performance evalua.on of the IPN model of controlled plant is accomplished whereby the simula.on in Matlab.