Description: PLC most of the preparation ladder through the realization of the program control, But for intelligent systems in terms of low-voltage switches, broken, broken by the control often requires the control room to operate remote control to complete. By the traditional method, a main control room to carry out a switchboard operation, the subject of a control order, PLC received the control orders, by the PLC program implementation of the order, The above procedures must be used or ladder logic programming instructions, when the huge number of switchgear or request multiple simultaneous control of equipment, PLC programming more complicated, particularly by using pulse-output control rather than power to maintain peace-control centers. Switchboard because the hours cooperation to control two sep
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