© The Institution of Engineering and Technology
A controllability condition of a siphon composed of three elementary ones in a class of Petri nets, namely S3PR, is developed. Under the condition, a maximally permissive liveness-enforcing supervisor expressed by a set of monitors (control places) can be decided by an algorithm with polynomial complexity for an S3PR if every dependent siphon is m-composed with m ≤ 3.
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http://iet.metastore.ingenta.com/content/journals/10.1049/el.2012.4512
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Optimal controllability of 3-composed siphons in a class of Petri nets