PROFINET的实时性及其协议分析

Analysis of Real-time Performance and Protocol Based on PROFINET

摘要:

针对目前现场总线技术无法满足工业控制领域对信息传输的速率以及信息传输实时性的较高需求,PROFINET实时协议迅速发展起来,该协议在通信方面较现场总线技术有更好的实时性以及更高的传输速率;首先对标准TCP/IP协议进行了研究,分析了PROFINET对标准TCP/IP协议的优化方式；然后详细介绍了PROFINET RT和PROFINET IRT的帧结构以及基于具体数据的实时性分析,为西门子STEP7对PROFINET的组态配置提供了一定的借鉴作用；最后采用西门子的PROFINET IO设备、IO控制器等,通过STEP7的组态配置,验证了PROFINET IO之间的通信。

Abstract:

In order to meet the high demand of the transmission rate and real-time performance in industrial control field, a real-time protocol of PROFINET for industrial Ethernet is proposed. The protocol has better real-time performance and higher transmission rate than the field bus technology. Firstly, the standard TCP/IP protocol was studied, and the optimization of the standard TCP/IP protocol for PROFINET was analyzed. Then, the frame structure of PROFINET RT and PROFINET IRT were analyzed in detail. The real-time analysis based on concrete data was introduced and this will be a certain reference for STEP7 configuration of Siemens. Finally, with the help of Siemens PROFINET IO devices and IO controller, through the configuration of Siemens STEP7, the communication between PROFINET IO devices were finally realized.