双总线结构工业控制计算机网性能指标评估

MODELING AND PERFORMANCE ANALYSIS OF DUAL-BUS INDUSTRIAL CONTROL COMPUTER NETWORKS

本文对双总线结构工业控制计算机网给出了其Ｐｅｔｒｉ网和高级Ｐｅｔｒｉ网的建模及性能指标评估方法．文中考虑了信包缓冲区容量有限、信包最大允许服务时间有限、不同的站点优先级和系统总线故障率等因素影响下的网络性能指标评估问题．克服了以往对网络性能评估的某些局限．本文讨论了带计数禁止弧的高级随机Ｐｅｔｒｉ网（ＨＤＳＰＮ）的特性，并对给出的ＤＳＰＮ模型进行了仿真计算，对影响网络性能的系统指标进行了讨论．

This paper presents the Petri nets and high-level Petri nets by which modeling and performance indices' analysis method for dual-bus industrial control computer networks is proposed. Several real network parameters are considered,such as the finite buffers, finite network serving time, stations' priority and bus malfunction, which generally determine the overall performance of a network. This algorithm overcomes the restriction that previous algorithms can not analyze the networks with finite buffers. A HDSPN with accountable inhibit arc is defined and its performance is discussed. A simulation is given to show the application and theeffects of various parameters in dual-bus industrial control computer networks.