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Brief paper: new controllability condition for siphons in a class of generalised Petri nets

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3 Author(s)
Liu, G. ; Sch. of Electro-Mech. Eng., Xidian Univ., Xi'an, China ; Li, Z. ; Zhong, C.

Over the last two decades, a number of deadlock control policies based on Petri nets were proposed for flexible manufacturing systems (FMSs). As a structural object of a Petri net, siphons are widely used in deadlock control. For system of sequential systems with shared resources (S4R), the current deadlock control policies based on max or max'-controlled siphons tend to overly restrict the behaviour of a controlled system. The controllability conditions of a siphon are relaxed by a new concept called max'-controlled ones. We conclude that an S4R is live if all its siphons are max"-controlled. Compared with the existing ones, the proposed one is more general. Examples are given to illustrate it.

Published in:

Control Theory & Applications, IET  (Volume:4 ,  Issue: 5 )