Analysis and Research on the Real-time Performance of Profibus Fieldbus

As the PROFIBUS is generally applied in the field of control, its feature of real-time has become more and more important. This paper promotes an improved analyzing method on the single-master PROFIBUS stations. In this method, single-master PROFIBUS DP networks' feature and its protocol are analyzed, and the impact on the messages' real-time and network load of different priority level using different token processing modes is researched. After that, it gives a calculation method of the response time in the PROFIBUS' worst network condition. At last, we could conclude that PROFIBUS is a type of definite network. At the same time, PROFIBUS network's real-time feature could meet the needs in most application situation.