A dualredundancy system based on PLC

WU Yingsheng
(No.38 Research Institute, China Electronics Technology Group Corporation, Hefei 230088, China)

Abstract: In order to solve the 24hour uninterrupted operation problem of a turntable driving system, a dualredundancy control system based on programmable logic controller(PLC) was designed. With reference to the heartbeat mechanism concept, which was used in computer cluster technology systems, PLC input and output ports were designed to data monitoring channel to control the switching between the master and the slave. After analysis of the principle, the method of hardware and the software was given. The turntable driving system has been worked for two years and the operation results indicate that the system is advanced, reliable and flexible. The application of this dualredundancy system in industry control system will help to improve reliability and reduce fault.
Key words: dualredundancy; programmable logic controller(PLC); heartbeat mechanism