Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.22/3646
Título: Communication response time in P-NET networks: worst-case analysis considering the actual token utilisation
Autor: Tovar, Eduardo
Vasques, Francisco
Burns, Alan
Data: 1999
Editora: Instituto Politécnico do Porto. Instituto Superior de Engenharia do Porto
Universidade do Porto
University of York
Resumo: Fieldbus networks aim at the interconnection of field devices such as sensors, actuators and small controllers. Therefore, they are an effective technology upon which Distributed Computer Controlled Systems (DCCS) can be built. DCCS impose strict timeliness requirements to the communication network. In essence, by timeliness requirements we mean that traffic must be sent and received within a bounded interval, otherwise a timing fault is said to occur. P-NET is a multi-master fieldbus standard based on a virtual token passing scheme. In P-NET each master is allowed to transmit only one message per token visit, which means that in the worst-case the communication response time could be derived considering that the token is fully utilised by all stations. However, such analysis can be proved to be quite pessimistic. In this paper we propose a more sophisticated P-NET timing analysis model, which considers the actual token utilisation by different masters. The major contribution of this model is to provide a less pessimistic, and thus more accurate, analysis for the evaluation of the worst-case communication response time in P-NET fieldbus networks.
Peer review: no
URI: http://hdl.handle.net/10400.22/3646
Versão do Editor: http://www.cister.isep.ipp.pt/docs/
Aparece nas colecções:ISEP – CISTER – Livro, parte de livro, ou capítulo de livro

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