Temporal performance evaluation of control architecture in automation systems
Résumé
The performances of automation systems are strongly linked to the performances of their control architecture. These architectures are the merger of a hardware structure – industrial computers and logic controllers connected to networks and fieldbuses – and of software components – implantation control functions. To manage these performances, the control engineer must evaluate them at each stage of the life cycle: from the project requirements to the setup stage, including the detailed design. In this paper, we present a method which evaluates timed performances of networked automation system and which guides the engineer throughout the control architecture development. A modular design has been retained to model the dynamic behaviour of the control architecture using Timed Coloured Petri Nets. To begin we present the design of generic modular models and we explain how these modules are instantiated and assembled to build the dynamic model of a whole control architecture. Next we present some enrichments of the assembled model in order to simulate the behaviour of the control architecture. These complements are some event generators – to excite the models – and some event observers – to detect, to date and to log the relevant events. Then we present the simulation results of four different timed performances on the same architecture. These results take the form of histograms of 10,000 simulated delays for each evaluated performance. Finally, the method suggested for the model construction is validated. by confrontation between the results of model simulation and the measurement of the real control architecture.
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