To evaluate and improve the real-time performance of Ethernet for plant automation（EPA） industrial Ethernet,the real-time performance of EPA periodic data transmission was theoretically and experimentally studied.By...To evaluate and improve the real-time performance of Ethernet for plant automation（EPA） industrial Ethernet,the real-time performance of EPA periodic data transmission was theoretically and experimentally studied.By analyzing information transmission regularity and EPA deterministic scheduling mechanism,periodic messages were categorized as different modes according to their entering-queue time.The scheduling characteristics and delivery time of each mode and their interacting relations were studied,during which the models of real-time performance of periodic information transmission in EPA system were established.On this basis,an experimental platform is developed to test the delivery time of periodic messages transmission in EPA system.According to the analysis and the experiment,the main factors that limit the real-time performance of EPA periodic data transmission and the improvement methods were proposed.展开更多
The authors propose a new persistent transmission based real time Ethernet MAC protocol that provides a predictable upper bound for the delivery delay of real time frames. Moreover, it is compatible with the protocol ...The authors propose a new persistent transmission based real time Ethernet MAC protocol that provides a predictable upper bound for the delivery delay of real time frames. Moreover, it is compatible with the protocol used by the existing Ethernet controllers for conventional datagram traffic and thus standard Ethernet stations can be used in the system without any modification. The paper describes the protocol in detail and analyses the maximum delivery delay for real time traffic and the efficiency of the channel.展开更多
为适应长征四号系列运载火箭控制系统的新状态、新需求,进一步提高控制系统测试覆盖性、消除安全隐患,对运载火箭测试系统开展了技术研究。通过梳理测试系统的功能,提出了一套基于面向仪器系统PCI扩展(PCI Extensions for Instrumentati...为适应长征四号系列运载火箭控制系统的新状态、新需求,进一步提高控制系统测试覆盖性、消除安全隐患,对运载火箭测试系统开展了技术研究。通过梳理测试系统的功能,提出了一套基于面向仪器系统PCI扩展(PCI Extensions for Instrumentation,PXI)技术的运载火箭实时监测系统,该套系统以PXI计算机为核心,结合模拟量采集、数字量采集、实时以太网和数据自动识别判读等技术,可完成该型号背景下的调试、试验和验收工作。测试数据表明,测试系统数据处理正确、系统匹配性合理、测量精度高,通用性强,在高态势的发射需求下,具有很好的应用前景。展开更多
基金Supported by the National High Technology Research and Development Program of China (2006AA040301-4,2007AA041301-6)
文摘To evaluate and improve the real-time performance of Ethernet for plant automation（EPA） industrial Ethernet,the real-time performance of EPA periodic data transmission was theoretically and experimentally studied.By analyzing information transmission regularity and EPA deterministic scheduling mechanism,periodic messages were categorized as different modes according to their entering-queue time.The scheduling characteristics and delivery time of each mode and their interacting relations were studied,during which the models of real-time performance of periodic information transmission in EPA system were established.On this basis,an experimental platform is developed to test the delivery time of periodic messages transmission in EPA system.According to the analysis and the experiment,the main factors that limit the real-time performance of EPA periodic data transmission and the improvement methods were proposed.
基金TheNationalNaturalScienceFoundationofChina (No .6 9984 0 0 3)
文摘The authors propose a new persistent transmission based real time Ethernet MAC protocol that provides a predictable upper bound for the delivery delay of real time frames. Moreover, it is compatible with the protocol used by the existing Ethernet controllers for conventional datagram traffic and thus standard Ethernet stations can be used in the system without any modification. The paper describes the protocol in detail and analyses the maximum delivery delay for real time traffic and the efficiency of the channel.
文摘为适应长征四号系列运载火箭控制系统的新状态、新需求,进一步提高控制系统测试覆盖性、消除安全隐患,对运载火箭测试系统开展了技术研究。通过梳理测试系统的功能,提出了一套基于面向仪器系统PCI扩展(PCI Extensions for Instrumentation,PXI)技术的运载火箭实时监测系统,该套系统以PXI计算机为核心,结合模拟量采集、数字量采集、实时以太网和数据自动识别判读等技术,可完成该型号背景下的调试、试验和验收工作。测试数据表明,测试系统数据处理正确、系统匹配性合理、测量精度高,通用性强,在高态势的发射需求下,具有很好的应用前景。
