How to Improve PowerLink Ethernet Synchronization Performance

Abstract

A method for improving synchronous performance of the Powerlink Ethernet comprises the steps that all slave stations establish local timers; the Ethernet communication cycle Tp and deterministic delay compensation value Toffset are obtained; when initially receiving an SOC package, each slave station starts the local timer and sets T as T=Tp-Toffset; from the second time of receiving the SOC package on, the actual timing movement and expected timing movement are compared at each time that the SOC package is received, and the time deviation tn of the actual timing movement and the expected timing movement is stored, wherein before the SOC package is received for the N+1 time, the timing period T in which the timing period circulation number is equal to reaching times of the SOC package at each time that the SOC package is received; later, n is cleared and counting is conducted again every time n is equal to N, the time deviation average value is calculated, and T is adjusted in N timing periods after a timing period one less than the reaching times of the SOC package which should be reached. The method has certain fault-tolerant capability on synchronous vibration of a main station.

Description

technical field [0001] The invention relates to a method for improving the synchronous performance of Powerlink Ethernet. Background technique [0002] With the development of Ethernet technology and electronic information technology, the traditional field bus is developing in the direction of industrial Ethernet. The main advantages of industrial Ethernet are fast transmission rate, large data packet capacity, long transmission distance, and flexible topology. The application of the bus in the industrial field, especially motion control, requires industrial Ethernet to have real-time performance—that is, deterministic communication, deterministic response, and synchronization. The new international standard IEC61784 Industrial Communication Networks-Profiles (Industrial communication networks-Profiles) defines real-time Ethernet according to the requirements of real-time performance (such as synchronization performance less than 1us), and includes 10 kinds of real-time Eth...

AI Technical Summary

Problems solved by technology

The jitter of a single node will not be large, but this jitter is cumulative, and it will be amplified when there are many nodes

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