描述
X0~X2的PLC的输入端,交流接触器KM的线圈接在编号为Y0的PLC的输出端。图1-5
中有4个输入/输出变量对应的I/O映像寄存器,图l-5中有PLC的梯形图,它与图1-3所示的继电器电路的功能相同。但是应注意,梯形图是一种软件,是PLC图形化的程序。图中的X0等是梯形图中的编程元件,X0~-X2是输入继电器,Y0是输出继电器。梯形图中的编程元件X0与接在输入端子X0的SBl的常开触点和输入映像寄存器X0相对应,编程元件Y0与输出映像寄存器Y0和接在输出端子Y0的PLC内部的输出电路相对应。梯形图以指令的形式储存在PLC的用户程序存储器中,图l-5中的梯形图与下面的5条指令相对应
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