基于DSPN的WorldFIP总线MAC子层的建模与分析  

The Model and Analysis of WorldFIP MAC Sub-Layer Based on DSPN

作　　者：周悦[1] 吴齐[2] 杨少文 

机构地区：[1]沈阳建筑大学信息与控制工程学院,辽宁沈阳110168 [2]沈阳建筑大学图书馆,辽宁沈阳110168 [3]联通鞍山分公司,辽宁鞍山114003

出　　处：《沈阳建筑大学学报（自然科学版）》2007年第3期518-521,共4页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(604340301);辽宁省博士启动基金(20041002);辽宁省教育厅基金(2004F044)

摘　　要：目的针对WorldFIP现场总线通信介质访问控制MAC子层通信过程进行建模与性能分析.方法WorldFIP总线采用集中式MAC机制,即由总线活动仲裁器按照一个预定的扫描变量表,控制周期性信息和非周期性信息在总线上的传递.通过应用确定与随机Petri网DSPN,根据微周期内周期窗口的情况,分别建立基于相等周期窗口、不等周期窗口和非零起始周期窗口的单网段WorldFIP总线通信过程DSPN模型.结果仿真实验获得了WorldFIP总线系统吞吐量、平均非周期信息时延和网络利用率与非周期性信息负载之间的定量关系.结论所建模型能够有效地描述和分析WorldFIP总线系统的通信机制,为工业控制网络通信协议的改进和实际工程应用提供了指导.A detailed DSPN （Deterministic and Stochastic Petri Net） model and performance analysis of the centralized medium access protocol for WorldFIP MAC sub - layer is constructed in this paper. The World- FIP protocol is based on a centralized communication media access control mechanism, where a Bus Arbitrator controls all data transferred between field devices, according to a Scanning Table predefined. The accurate DSPN models of WorldFIP MAC based on the same size periodic window, different size periodic window and the nonzero starting periodic window are constructed according to the characteristics of periodic window in each microcycle respectively. The simulation research based on the DSPN model is developed, which shows the quantitative relation throughout mean aperiodic message delay and utilization with traffic load of aperiodic messages. These results show the DSPN model can effectively describe and analyze the communication behavior of WorldFIP system for engineers and researchers.

关 键 词：集中令牌协议 确定与随机PETRI网 DSPN 建模 网络性能 

分 类 号：TN915.04[电子电信—通信与信息系统] TP393.1[电子电信—信息与通信工程]