Description
由梯形图可见,第一个X0的上升沿,将使Y0线圈接通并自锁。同时,CT100对X0作减1计数。X0的第二个上升沿到来时对Y0不起作用,但CT100对其计数,故C100常开闭合使R0线圈接通。下一个扫描周期,断开了的R0常闭触点使Y0线圈断开并打开自锁
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