A Disconnection Fault Detection and Clock Synchronization Recovery Method of Industrial Ethernet

Abstract

The invention discloses a method for detecting industrial Ethernet disconnection fault and recovering clock synchronization. The method comprises following steps: setting port time-out parameters for each slave station port; sending return frames to a master station after waiting for the time set by the time-out parameters when disconnection fault occurs; determining whether disconnection fault occurs according to whether a first port of the master station receives the return frames or not; determining whether data frame forward direction transmission is normal or not according to whether a second port of the master station receives the return frames or not; on the other hand, the master station sending data frames with time stamp message, obtaining transmission delay of the slave station according to the time stamp of the data frames returned from the slave station, and adjusting clock for each slave station according to the transmission delay to realize coarse clock synchronizing of slave stations; then, the master station writing compensating factors in sent data frames for the slave stations, each slave station performing drift compensation and offset compensation according to the compensating factors to realize precise clock synchronizing. By means of the method, disconnection fault can be responded in real time and clock synchronizing recovery can be realized within an interpolation cycle; the method has high reliability and high real-time performance.

Description

technical field [0001] The invention belongs to the technical field of industrial Ethernet communication, and more specifically relates to a method for detecting a disconnection fault of an industrial Ethernet and recovering clock synchronization. Background technique [0002] In recent years, due to the obvious advantages of industrial Ethernet in high-speed data transmission, mature technology, low price, easy networking, and easy to use, it has developed rapidly in the field of industrial control. [0003] In the field of industrial control, for mechanical vibrations in industrial on-site processing and possible disconnection or loosening faults caused by unconscious actions, physical reinforcement or stronger wiring methods are generally used to prevent possible disconnection or loosening faults; or Change the transmission medium and configure the cable protection drag chain as a short rod to prevent disconnection; in the Internet field, the response to equipment disconn...

AI Technical Summary

Problems solved by technology

Therefore, ordinary physical reinforcement or changing the transmission medium and the Internet only respond to disconnection faults from the software layer, which cannot meet the high real-time requirements of industrial sites. It is necessary to seek disconnection fault detection and clock synchronization recovery applicable to the industrial Ethernet field Methods

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