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Study of Computer Algorithms in PROFIBUS Dp Devices Fault Diagnostics

Author: ShuJian
Tutor: LiNing；JiaYiGang
School: Shanghai Jiaotong University
Course: Control Engineering
Keywords: PROFIBUS fault diagnostic dichotomy P tree model binary P tree model
CLC: TP273
Type: Master's thesis
Year: 2011
Downloads: 75
Quote: 0
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Abstract


With the rapid industrialization of China, PROFIBUS network has been a growing number of modern industrial automation systems. Modern factories are not only improved the efficiency by the PROFIBUS field system, but also depend too much on the reliability of the field bus system. Even one PROFIBUS DP device fault in the system, always affect the multiple network segments or the entire network communication, and lead to unplanned downtime. In order to ensure the production, capacity utilization, demands that we must quickly identify problems and diagnostic fault point.In this paper, two typical computer algorithms, Dichotomy and Tree model, are introduced for the rapid diagnosis of equipment failure in PROFIBUS bus network segment and overall network structure. Through the application of two algorithms used in the DP device diagnosis and diagnostic equipment faults and analyze from the theory, modeling, calculation examples and efficiency.First, the mode of PROFIBUS segments was built, and then describes the Dichotomy and Dichotomy&Repeater algorithms for the PROFIBUS segments in diagnostic algorithm of fault diagnosis equipment. For the maximum number of 32 DP PROFIBUS network segments, both Dichotomy algorithms were enough in the diagnosis algorithm five times or three times after the completion of a recursive fault diagnosis. Secondly, dwelt at length introduced PROFIBUS tree model and binary tree model. Through model, the graphical method and matrix method was used for rapid diagnosis through PROFIBUS network segment failure to conduct a detailed study and elaboration. Graphic method can be used to establish charts, visually locate the fault within the network segment; tree traversal matrix model by the corresponding row, column matrix, can complete failure of the product positioning after a simple calculation. Then, by describing the algorithm in different instances of the application, get the optimal algorithm under different circumstances. For the convenience, the complexity of the algorithm to use different algorithms for efficiency comparison was defined in the text. The paper not only gets the optimal algorithm under different system but also an important conclusion that the best the number of repeaters of the PROFIBUS network systems.At last, a number of PROFIBUS field system running example in paint shop of Shanghai General Motors, the most representative of the domestic auto manufacturers, are used to describe the detailed description of the PROFIBUS DP fault diagnosis in actual system and its help. The study of diagnosing PROFIBUS equipment failure can provide a fast, simple and accurate fault diagnosis in the increasing use of PROFIBUS as the bus companies for Shanghai General Motors PROFIBUS systems.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation systems > Automatic control,automatic control system
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