Real-time communication and clock synchronization method of chain network

Abstract

The invention discloses a real-time communication and clock synchronization method of a chain network, comprising the following steps that: A, a primary device enumerates and configures each slave device, starts a forwarding function of each slave device and forms an Ethernet chain network structure; B, the primary device and the slave device or the slave devices mutually exchange a delay request message and a delay response message to obtain related time stamps, and then, calculate a path delay between the current device and the next slave device and store the path delay in the current device; C, the primary device sends an initial deviation correcting signal message, each slave device orderly finishes initial deviation correction on a local clock after receiving the initial deviation correcting signal message; D, the primary device periodically communicates with each slave device in real time in a manner of collecting total frames, wherein a clock synchronization process is embedded in the real-time communication process. The method provided by the invention solves the real-time communication scheduling problem caused by combination of the real-time communication and the clock synchronization.

Description

technical field [0001] The invention relates to a real-time communication and clock synchronization method, in particular to a real-time communication and synchronization method based on a chain network of lumped frames and transparent clocks. Background technique [0002] Due to its good openness, wide application and low price, Ethernet has been increasingly used in industrial field communication. Compared with the traditional commercial Ethernet, the Ethernet information transmission system used in the industrial field requires higher real-time performance, and thus puts forward higher requirements for the system clock synchronization as the real-time basis of network information transmission. [0003] The clock synchronization of multiple nodes in the current Ethernet information transmission system generally adopts the IEEE 1588 protocol, and its basic function is to keep other clocks in the distributed network synchronized with the most accurate clock. A Precision Tim...

AI Technical Summary

Problems solved by technology

If a reasonable real-time communication scheduling is not adopted, the above steps will interfere with each other, which will cause system communication failures and destroy real-time and synchronization.

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