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
In order to ensure that a mobile launch platform is able to transport a launch vehicle which is assembled vertically on a complex orbit,a communication network for the drive control system was designed.Based on the ch...In order to ensure that a mobile launch platform is able to transport a launch vehicle which is assembled vertically on a complex orbit,a communication network for the drive control system was designed.Based on the char-acteristics of equipment of the drive control system and its position,Industrial Ethernet and Profibus were selected.To meet the requirements for reliability and maintainability of aerospace products,the communication network featured a hot redundant to avoid single point failure risk,so that if any point in the system fails,the control strategy of standby switches using heartbeat detection and parity check would ensure the normal communication and failure diagnostics,which could enable the transport mission of the launch vehicle to be completed smoothly.展开更多
To accomplish the safety-critical mission of transmission and distribution automation, high availability and stability are always required in the industrial communication networks. The IEC 62439 Standard (Industrial c...To accomplish the safety-critical mission of transmission and distribution automation, high availability and stability are always required in the industrial communication networks. The IEC 62439 Standard (Industrial communication networks-High availability automation networks) Part 3 defines the Parallel Redundancy Protocol (PRP) and High-availability Seamless Redundancy (HSR) protocols. Both redundancy protocols target the process bus described in IEC61850 9-2 [1] and support only Local Area Networks (LANs). It has become an active research area to extend the redundancy protocols to the Wide Area Network (WAN) communication with existing network infrastructure. This paper offers a novel solution, namely the parallel redundancy protocol over the wide area networks (PRPW), to enable PRP over WANs with no added overheads to the data frame, while retaining full compatibility. Moreover, PRPW also strengthens the cyber security against spoofing attacks by maintaining a comprehensive list of remote communication units.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.
文摘In order to ensure that a mobile launch platform is able to transport a launch vehicle which is assembled vertically on a complex orbit,a communication network for the drive control system was designed.Based on the char-acteristics of equipment of the drive control system and its position,Industrial Ethernet and Profibus were selected.To meet the requirements for reliability and maintainability of aerospace products,the communication network featured a hot redundant to avoid single point failure risk,so that if any point in the system fails,the control strategy of standby switches using heartbeat detection and parity check would ensure the normal communication and failure diagnostics,which could enable the transport mission of the launch vehicle to be completed smoothly.
文摘To accomplish the safety-critical mission of transmission and distribution automation, high availability and stability are always required in the industrial communication networks. The IEC 62439 Standard (Industrial communication networks-High availability automation networks) Part 3 defines the Parallel Redundancy Protocol (PRP) and High-availability Seamless Redundancy (HSR) protocols. Both redundancy protocols target the process bus described in IEC61850 9-2 [1] and support only Local Area Networks (LANs). It has become an active research area to extend the redundancy protocols to the Wide Area Network (WAN) communication with existing network infrastructure. This paper offers a novel solution, namely the parallel redundancy protocol over the wide area networks (PRPW), to enable PRP over WANs with no added overheads to the data frame, while retaining full compatibility. Moreover, PRPW also strengthens the cyber security against spoofing attacks by maintaining a comprehensive list of remote communication units.
