Abstract: To meet the high quality for clock synchronization in EPA network system, a two-dimension fuzzy controller is constructed to demonstrate the quality of every device. The optimal master clock of the system is selected quickly and exactly from multi-field devices based on equitable competition. Based on the algorithm, the stability of EPA system is improved and the fluctuation of local clock is reduced. The accuracy of field devices’ clock synchronization is up to 50μs.

Key words: Ethernet for plant automation(EPA), master clock, precision clock synchronization protocol(PTP), fuzzy control, time-stamping

摘要： 为满足EPA网络时间同步的高精度要求，建立了一种二维模糊控制器来确定设备自身时钟的优劣层次，系统采用公平竞争的方法从众多现场设备中快速、准确地决策一个时钟性能最好的设备作为EPA系统的最佳主时钟，保证了系统运行的稳定性，降低了本地时钟的波动，使现场设备的时钟同步精度提高到50μs。

关键词: EPA, 主时钟, 精确时间同步协议, 模糊控制, 时间戳

CLC Number: 

• TP273