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The onward dispersion of Ethernet based structures with decentralized and distributed multi-user environments in automation leads towards networked automation systems (NAS). The new modern structures are less expensive and at the same time more flexible than classical ones. However, they induce non-deterministic delays. Hence, the detailed analysis of the resulting response time is not only prerequisite for the responsible use; it also enables to check dependability properties prior-to changes or expansions of the system. To do so, a new modeling language -DesLaNAS -is introduced, which accounts for the special needs of modeling NAS. Based on probabilistic model checking for the analysis, the influence of different components and of net-based behavior modes like resource-sharing and synchronization on the resulting response time is discussed.
Date of Conference: 25-28 Sept. 2007