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该文介绍 PLC 与上位机的通信实现,提出了一种价格低、体积小的接口方案,讨论了其硬件和软件的实现方法.“,”This text introduction PLC realizes with the correspondence of the place of honor machine, putting forward a kind of price low, the physical volume connects a peo- ple''s project smallly,discussing its hardware to realizes with the software method.