DeviceNet现场总线中轮询协议的性能研究

Performance Study on Polling Protocol in DeviceNet Fieldbus

基于DeviceNet协议生产者/消费者通信模型特点构建了其轮询通讯方式模型,轮询命令报文由主站广播至生产从站,轮询响应报文由生产从站通过主站周期地轮询每个生产从站广播至所有消费从站;文章采用Petri网的过程变迁TPN混合方法对DeviceNet总线协议进行了分析和研究,对其轮询通讯方式进行了模拟,讨论了响应时间、吞吐量等参数,分析了性能差异和响应快慢,根据文章的结论,现场总线的设计者可以很好的选择和设计满足自己需要的设计方案。

Based on the characteristics of Producer/Consumer communication model of DeviceNet protocol, a polling scheme is set up. Poll command message is broadcasted from a master station to producer slave stations, and then poll response message is transported from producer slave station to consumer slave station through polling of master station in periods. Timed Petri Net with procedures are used to study the features of DeviceNet fieldbus, simulate the poll communication model, discuss the time of response, thuoughput and so forth, and analyze capability. According to the conclusion, the designer can effectively choose and design his project.