PROFIBUS is one of the international standards for fieldbus technology. Based on a brief introduction to the PROFIBUS-DP token bus protocol, this paper deeply analyzes the behavior of various time parameters that affect bus data exchange, token transfer, and system status check, establishes a mathematical model of bus cycle time using random processes, and focuses on discussing the relationship between the token target cycle time TTR and the token actual cycle time TRR. Finally, a method to improve the real-time performance of the system is proposed.
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