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This paper provides a comprehensive study on how to support time critical distributed applications using PROFIBUS. We show that, despite the absence of synchronous bandwidth allocation, it is possible to guarantee real-time behaviour for the high-priority traffic in PROFIBUS networks. The main contribution of this paper is to give a methodology for the setting of the T TR parameter, by proper analysis of the worst-case real token rotation time (T RR ).doi:10.1007/978-3-7091-6421-1_47 fatcat:vehfccdvkfckbgza3f4x4ce2yy