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图(c)为按下SB1按钮后的第二个扫描周期。①输入扫描,由于输入状态不变,输入映像区不变。②执行程序过程,行,X0触点闭合,由于上一个周期中,Y1为ON状态,因此,Y1触点也闭合,Y0也呈导通状态;第二行,Y1还呈导通状态。Y0、Y1的状态均为“1”。③输出刷新过程,两个灯都亮。注意:由于PLC的扫描周期很短,我们用肉眼见到的现象可能是两灯同时亮。如果按钮没有变化,内部继电器、输出设备状态均无变化。
图( d)为松开SB1按钮后的个扫描周期。①输入扫描使输入映像区的X0存“0”、 X1存“1”。②执行程序过程,X0触点断开, Y1由于上个周期被置“1”,因此,Y1触点为闭合状态。③输出刷新过程,由于X0触点的断开,Y0 、Y1都呈断开状态。
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