Method for synchronizing host parameter of three-scale redundancy control system

Abstract

The invention relates to a synchronizing method for host parameters of a triple redundancy control system, belonging to the redundancy control field and adopting a method of point-to-point request-response combining timestamp to carry out the parameter synchronization to two hosts in the system. The synchronizing method is as follows: after initialization, a new power up host judges whether other host is on line at first. If other host does not on line, operating according to parameters directly and outputting; if other host is on line, sending a request packet to the host, and the request packet comprises a timestamp T1 when the packet leaving; and then the online host receives the request packet and fills a time stamp T2 when the packet arriving, the parameters that need to be synchronized is packed, a time stamp T3 when a respond packet leaving is filled in and is sent back to the new power up host; the new power up host receives the respond packet and fills a time stamp T4. According to the four timestamps, the network delay (T4 minus T3) from sending the respond packet by the online host to receiving by the new power up host and a clock excursion theta between two hosts are calculated, and a synchronic parameter is corrected by the value of (T4 minus T3) plus theta. The method of the invention eliminates the affect of clock excursion and network delay to the parameter synchronization, solves the output change when the system host switches and ensures the stability and reliability of the system.

Description

Technical field [0001] The invention relates to the control field of redundant systems, in particular to a host parameter synchronization method of the redundant control system, which is used to solve the problem of different outputs caused by timing differences when the redundant hosts are powered on. technical background [0002] The triple redundant fault-tolerant control technology has been developed in recent years, and has the characteristics of high reliability, high availability and no single point of failure. The system recognizes faults and automatically compensates for them, allowing online repairs and parts replacement without interrupting system operation. The system has carried out triple redundancy for each link, and the processing of the input module, the host computer and the output module has been voted out of three. [0003] There are three hosts in the triple redundant control system, and the three hosts are distinguished by assigning different addresses...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for synchronizing the parameters of two hosts in a triple redundant system, so as to solve the problems of output data differences and output asynchrony on the three buses caused by the switching of one, two, and three hosts , to improve the reliability and safety of the triple redundant control system

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