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Date of machine industry as the central control unit,equipped with configuration software, use large-screenreal-time monitoring interface, the achievement of thecontrol points of the dynamic display, data modification,fault diagnosis, automatic alarm, but also show the queryrecord of historical events, the system of major parts totalrunning time, the device process flow diagram, the devicestructure and so on. Central control unit and slave serialcommunications between the PLC data exchange, usuallyselected from the 485 in less than 1000m twisted paircommunication, fiber can choose from more frequentcommunication, more long-distance wireless communica-tion can also be used. PLC control of the lower computeruse, according to the number of control objects, controlthe scope of the object, the choice of one or more controlPLC, PLC data exchange between the registers is to useinternal links, data exchange and sharing. The PLC real-time monitoring of the site into a high reliability, and pro-gramming is simple, flexible, and therefore more andmore people attention.