Integrated approach based on High Level Petri Nets for evaluating Networked Control Systems

The aim of this paper is to propose an integrated modelling environment to represent globally the networked control systems (NCS) behaviour by using the high level Petri nets (HLPN) formalism. This work considers NCS based on switched Ethernet architectures. This communication architecture is modelled with HLPN and is evaluated according to different scheduling mechanisms and traffic load. After that, NCS model based on HLPN is proposed. This model integrates the Ethernet switch model and applicative environment of NCS: controller, process... Finally, a strategy to control the network in order to adapt the quality of service (QoS) according to the quality of control (QoC) required by the application is proposed. This strategy is based on a weighted round robin policy. The obtained results show that the scheduling mechanisms enable to improve the performance of communication system and then to improve the application performances.