Profibus networks are widely used as the communication infrastructure forsupporting distributed computer-controlled applications. Most of the times, theseapplications impose strict real-time requirements. Profibus-DP has gradually become thepreferred Profibus application profile. It is usually implemented as a mono-masterProfibus network, and is optimised for speed and efficiency. The aim of this paper is toanalyse the real-time behaviour of this class of Profibus networks. Importantly, wedevelop a new methodology for evaluating the worst-case message response time insystems where high-priority and cyclic low-priority Profibus traffic coexist. The proposedanalysis constitutes a powerful tool to guarantee prior to runtime the real-time behaviourof a distributed computer-controlled system based on a Profibus network, where the realtimetraffic is supported either by high-priority or by cyclic poll Profibus messages.
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