Verification of logic controllers for continuous plants using timed condition/event-system models

Authors:
S. Kowalewski;S. Engell;J. Preuβig;O. Stursberg
Affiliations:
Process Control Laboratory, Chemical Engineering Department, University of Dortmund, D-44221 Dortmund, Germany;Process Control Laboratory, Chemical Engineering Department, University of Dortmund, D-44221 Dortmund, Germany;Process Control Laboratory, Chemical Engineering Department, University of Dortmund, D-44221 Dortmund, Germany;Process Control Laboratory, Chemical Engineering Department, University of Dortmund, D-44221 Dortmund, Germany
Venue:
Automatica (Journal of IFAC)
Year:
1999

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Abstract

An approach to the formal verification of logic controllers for processes with switched continuous dynamics is presented. The method builds on modular, timed discrete event models of the plant and the controller. Subsystems with continuous dynamics are approximated algorithmically. The formal verification consists of determining the reachable discrete states of the resulting model and comparing it to a set of undesired states. For this purpose, the tool HyTech is applied. The approach is illustrated by the treatment of a process engineering example.