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Modelling and PLC-based Implementation of Modular Supervisory Control

Anders Hellgren (Institutionen för signaler och system, Reglerteknik och automation) ; Bengt Lennartson (Institutionen för signaler och system, Reglerteknik och automation) ; Martin Fabian (Institutionen för signaler och system, Reglerteknik och automation)
Proceedings of the 6th Workshop on Discrete Event Systems, Zaragoza, Spain, OCT 02-04, 2002 p. 371-376. (2002)
[Konferensbidrag, refereegranskat]

Implementation of supervisory control in Programmable Logic Controllers (PLCs) typically requires that the underlying discrete event models of plant, specification as well as the supervisor itself fulfil a number of properties. These properties are discussed and methods for solving related problems are given. In particular, determinism and synchronisation issues are investigated. In a manufacturing system, for instance, there are typically a set of processes using a set of shared resources. Uncareful modelling may cause the system model to become nondeterministic. This can be circumvented by relabelling the relevant models. For industrial-sized models, though, this must be done automatically, something that we achieve by parameterising the models. Given a deterministic model, consisting of several interacting entities, we discuss its PLC-based implementation. In addition to the synchronisation of plant and supervisor, a modular supervisor must be internally synchronised. However, synchronisation of the submodules is not well defined in the PLC-world. This may be achieved by using event monitors and an immediate transit/immediate action execution model.



Denna post skapades 2006-09-12. Senast ändrad 2016-02-01.
CPL Pubid: 15061

 

Institutioner (Chalmers)

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

Ämnesområden

Information Technology

Chalmers infrastruktur