End-to-end Delay Modeling And Performance Analysis Of Industrial Ethernet

In recent years, Ethernet extends down from the management level to control-level and device-level has become a trend and consensus. The increasing communication needs in the lowest level brings new challenges to the real-time performance of industrial Ethernet Protocol existing in the world. In deterministic communication networks, end-to-end delay is one of the most important indicators to evaluation the real-time performance of Industrial Ethernet. End-to-end delay modeling and analysis with quality of service (QoS) guarantee becomes a challenging task for engineers. The paper focused on the following aspects:Firstly, this paper investigates the new industrial communication needs and a lot of cases with hybrid multi-priority information communication in the context of new industrial growth of industrial applications. We proposed a evaluation framework for real-time performance of industrial Ethernet system, and discussed the complete function modules and design steps, from data collection, data filter to visualization of output results. Further, we build an real-time testing platform based PROFINET IO Industrial Ethernet. We realize systems integration through hardware configuration and software installation.Then, to get end-to-end delay distribution of Real-Time data, this paper used experimental statistical analysis combined with mechanism analysis. Based on the test platform, we have designed a lot of common test cases, and focus on the following two data streams modes: Real-Time data only, hybrid Real-Time/Not-Real-Time data in multi-hop switched Ethernet. The key parameters affecting end-to-end delay distribution has been studied, a precise mathematical model of end-to-end delay is established. A series of useful conclusions is obtained.Lastly, two theoretical tools for end-to-end delay distribution modeling, based on network calculus and frequency domain analysis, were used. We use network calculus theory to obtain its bound for industrial Ethernet with prioritization. We study the feasibility and conservative of network calculus. Lastly, we adopt frequency domain method for large-scale network end-to-end delay analysis, the result shows this method is feasible and has its own advantages.