Description
确定PLC的软元件，画出PLC的外部接线图PLC的输入信号：起动按钮SB1(X1)，停止按钮SB(X0)，热继电器常开触点FR(X2)。PLC的输出信号：主接触器KM(Y0)，起动接触器KMY(Y1)，运行接触器KM△(Y2)。定时器(T0)。根据上述I/O信号，可画出PLC的外部接线图
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