提出一种基于主机、备机同时运行,并在主机异常或被拔出时能以较低延迟自动切换备机接管与从机通信的冗余系统。上电后无需等待上位机设置,系统自动选举主机、备机,加速系统初始化。通过主机与备机之间互相检测心跳和在位指示信号,判断是否需要执行主机备机切换。通过环形缓存实现数据同步,保障主机备机切换时刻通信数据不丢失,从而提高通信可靠性。验证结果表明,在数据带宽为12.5 Mb/s的冗余通信系统中,当主机异常或被拔出后经过170 μs切换延迟,备机接管与从机通信。

In the paper,a redundant system is proposed based on the simultaneous operation of the master and the backup,which can automatically switch the backup to take over the communication with the slave with a low delay when the master is abnormal or pulled out.After power-on,there is no need to wait for the host computer to set up,the system automatically elects the host computer and the standby computer to speed up the initialization of the system.Through the mutual detection of heartbeat and in-position indication signals between the host and the standby,it is judged whether it is necessary to perform the host-standby switch.The data synchronization is realized through the ring cache,which ensures that the communication data is not lost when the host-standby switch is switched,and improves the communication reliability.The verification shows that in a redundant communication system with a data bandwidth of 12.5 Mb/s,when the master is abnormal or pulled out,after a switching delay of 170 μs,the standby takes over the communication with the slave.