A clock synchronization method, device, computer storage medium and electronic equipment

Abstract

The invention discloses a clock synchronization method and device, a computer storage medium and electronic equipment, and the method comprises the steps: achieving the determination of time deviationthrough the receiving and transmitting of a time stamp of a conventional message, and judging whether to carry out the time synchronization or not according to the time deviation through network delay. Furthermore, the excessive delay jitter is judged through the network delay, so that the influence of the excessive delay jitter on the time correction of the time service end is avoided.

Description

technical field [0001] This article involves but is not limited to automation technology, especially a clock synchronization method, device, computer storage medium and electronic equipment. Background technique [0002] In occasions that require precise time synchronization, such as comprehensive monitoring, power communication, factory (distributed control system) DCS, etc., it is difficult to meet the accuracy requirements of time synchronization only by the clock signal provided by the computer itself. According to statistics, more than 90% of the computer time deviates from the international standard time by more than 1 minute. This is because the clock signal of the computer comes from its own simple crystal oscillator. After time correction, there is usually a time drift of a few seconds per day. Logs, alarms, time sequence records (SOE) in industrial automation systems all use time as the first sorting element, especially in the process of fault analysis, wrong time...

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Problems solved by technology

[0004] Although the local time of the client can be corrected based on NTP, in actual industrial automation production, there are the following problems: 1. Many network devices and communication media using serial ports do not support NTP; 2. Traditional industrial automation communication protocols are basically NTP is not used; for example: 101 and 103 protocols only make simple corrections to the transmission delay according to the theoretical serial port transmission time (the length of the message divided by the transmission speed); 104 protocols do not correct the local time of the client; It is a serial communication protocol published by programmable logic controller (PLC) communication, which is a commonly used connection method between industrial electronic equipment), field bus (Profibus) and other protocols themselves do not restrict the specific timing format, which is mainly determined by each application The manufacturer independently formulates the format and specification of the school time message. Generally, the slave station corrects the local time of the client according to the time information received from the master station.

3. NTP assumes that the transmission delay in both directions of the network is the same, but in the actual environment, the two-way delay is difficult to be strictly consistent. When a large delay error occurs in the long-term communication process, it will cause the clock of the client device to be corrected. jitter

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