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.
Key words
redundant system /
active-standby mode switching /
ring buffer /
DSP /
FPGA
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