摘要
PROFINET作为新兴的实时以太网工业通信标准,其时滞分析成为国内外研究的焦点。在现代工业自动化领域当中,实时过程数据和低优先级的非实时数据将长期共存。为了研究非实时数据包对实时数据的延迟分布的影响,根据PROFINETIO非抢占式优先级调度机制,首先从理论上建模分析了线性拓扑结构下实时数据流在交换机上的延迟时间,重点研究混杂有非实时数据流的通信模式下的延迟时间分布;进而搭建了物理平台,研究非实时数据流的参数变化对实时数据的核心参数的影响。最后对测试结果进行分析,得出实时帧的延迟模型和非实时数据包长度、发包间隔、股数以及交换机个数的关系,这些结论为以后建立大规模、高可靠性网络仿真奠定了良好的基础。
PROFINET is an emerging real-time industrial Ethernet communication standard, its time delay analysis becomes the study focus both at home and abroad. In modern industrial automation areas, real-time process data and non-real-time data with lower priority will be coexistent in long term. To study the impact of non-real-time data on real-time process data, the delay time of real-time data has been theoretically analyzed under linear topology structure according to non-preemptive scheduling mechanism of PROFINET IO; then a physical platform has been built to study the impact of the parameter changes of non-real-time data streams on the core parameters of RT frames. Test results are analyzed; the relationships between the delay time model of real-time frames and the lengths, package gaps, numbers of non-real-time streams, and the number of switches are obtained. These conclusions lay a good foundation for building large-scale, high-reliability industrial networks in the future.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2011年第9期2153-2160,共8页
Chinese Journal of Scientific Instrument
基金
国家自然科学基金(No.60873223
No.90818010)
浙江省国际合作计划(No.2009C34002)资助项目
