FORRBIDDEN STATE APPROACH FOR PETRI NETS USIGN PLC

Year 2013, Volume: 14 Issue: 1, 67 - 74, 18.03.2013

Elif Aybar , Aydın Aybar

Abstract

In this work, the forbidden state controller design approach is considered to realize by using PLC for Petri nets. First, the structure of the ordinary Petri nets is transfer to the ladder diagram form of PLC, a controller design for the forbidden states, the controlled ladder diagram is obtained such that information about the marking vector and the disabled transition, which are obtained by using the de-signed controller. The controlled ladder diagram is obtained such that the information which contains on the state and disabled transition, is added to the ladder diagram. In addition, the algorithm and steps are also given to add the designed controller to the ladder diagram. Consequently, the occurence of the forbidden states is avoided in the considered Petri net by the developed method.

Keywords

Petri nets, Forbidden states, PLC

Uygulamalı Bilimler ve Mühendislik

Abstract

Bu çalışmada, Petri ağları için yasaklanmış kontrolör tasarım yaklaşımının, PLC kullanılarak gerçeklemesi ele alınmıştır. Öncelikle, temel Petri ağının yapısı, merdiven diyagramı formunda PLC’ye aktarılmakta, yasaklanmış durumlar için kontrolör elde edilmekte ve son olarak elde edilen kontrolörde işaretleme vektörü ve ateşlenmesine izin verilmeyen geçiş bilgileri, merdiven diyagramına ilave edilerek kontrol edilmiş merdiven diyagramı elde edilmektedir. Ayrıca, kontrolörün merdiven diyagramına ilave edilebilmesi için gerekli algoritma ve adımlar da verilmiştir. Böylece, geliştirilen yöntem ile ele alınan Petri ağında yasaklanmış durumların meydana gelmesi engellenmektedir

Keywords

Petri ağları, Yasaklanmış durum, PLC

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