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PLC-based Implementation of Supervisory Control for Discrete Event Systems

Martin Fabian (Institutionen för signaler och system, Reglerteknik och automation) ; Anders Hellgren (Institutionen för signaler och system, Reglerteknik och automation)
Proceedings of the 37th IEEE Conference on Decision and Control, Tampa, Florida, USA, 16 Dec 1998-18 Dec 1998 Vol. 3 (1998), p. 3305 - 3310.
[Konferensbidrag, refereegranskat]

The supervisory control theory is a general theory for automatic synthesis of controllers (supervisors) for discrete event systems, given a plant model and a specification for the controlled behavior. Though the theory has for over a decade received substantial attention in academia, still very few industrial applications exist. The main reason for this seems to be a discrepancy between the abstract supervisor and its physical implementation. This is specifically noticeable when the implementation is supposed to be based on programmable logic controllers (PLCs), as is the case with many manufacturing systems. The asynchronous event-driven nature of the supervisor is not straightforwardly implemented in the synchronous signal-based PLC. We point out the main problems of supervisor implementation on a PLC, and suggest procedures to alleviate the problems.

Nyckelord: supervisory control theory; flexible manufacturing systems; programmable logic controller



Denna post skapades 2006-09-12. Senast ändrad 2016-02-01.
CPL Pubid: 15954

 

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Institutioner (Chalmers)

Institutionen för signaler och system, Reglerteknik och automation (1900-2004)

Ämnesområden

Information Technology

Chalmers infrastruktur