Time synchronization method based on double ring bus

Abstract

The invention relates to a time synchronization method based on a double ring bus; the method comprises the following steps: initializes master / slave equipment; the master equipment packages a sending time to synchronization messages sent to the adjacent slave equipment; the slave equipment i stores a synchronization message, coming from a loop, receiving time ti and packages a synchronization message sending time ti' into the synchronization message sent to the slave equipment i+1, and the slave equipment i+1 stores a synchronization message receiving time ti+1; simultaneously in another loop, the slave equipment i+1 sends another synchronization message, going to the slave equipment i, sending time si+1 and the time ti+1 to the slave equipment i through the synchronization message; the slave equipment i saves the message receiving time si; the slave equipment i calculates a clock deviation amount and communication delay between the slave equipment i and the slave equipment i+1, and corrects a local clock, thereby completing time synchronization of the double ring bus master / slave equipment. The synchronization message can be simultaneously sent a transmission line, and the synchronization can be completed in one communication period, thereby effectively improving instantaneity; and synchronization efficiency is high.

Description

technical field [0001] The invention proposes a new time synchronization method between devices by using a double-ring structure bus, which belongs to the technical field of communication. Background technique [0002] In the field of industrial control, in order to detect and locate abnormal situations in real time, it is usually necessary to maintain strict time synchronization in management monitoring equipment and related automatic equipment, and record the sequence and time of events in time through the control system. In traditional control systems, the millisecond-level data sampling cycle can already meet the usual monitoring needs, but in large-scale industrial control systems, with the expansion of field devices, the system complexity is relatively high, which affects the synchronization accuracy. requirements are becoming increasingly stringent. For example, in a slow system like temperature and pressure monitoring, the synchronization accuracy is maintained at t...

AI Technical Summary

Problems solved by technology

[0004] However, in high-real-time industrial sites, the existing communication methods and the system architecture in the equipment can no longer meet its requirements for time accuracy

Images