In modern industrial production, automation equipment such as PLC and fieldbus are increasingly used. In order to prevent unnecessary production stoppages and safety issues caused by PLC failures, PLC manufacturers have launched dual-machine hot backup products. For small and medium-sized control systems, the cost of using some established dual-machine hot backup products will be too high. Therefore, this article discusses the method of realizing dual-machine hot backup through software based on Omron PLC. Keywords: PLC, Dual controllers system, RS-232C,Software, OMRONAbstract: in the modern industry production, automation devices like PLC and Fieldbus are more and more widely used. At present, in order to prevent the unnecessary production intermission and security matter caused by fault of PLC, every PLC manufacturer bring forward their dual controllers backup system. With regard to middling and small system, it is too expensive to adopt the present dual controllers backup system. So author discuss realizing the dual controllers backup system in the way of software based on the OMRON PLC.Keyword: PLC, Dual controllers system, RS-232C,Software, OMRON
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