描述
在PLC控制程序设计过程中,经常要对脉冲输入信号或者是点动按钮输入信号进行保持,这时常采用自锁电路。自锁电路的基本形式如图6-16所示。将输入触点(X1)与输出线圈的动合触点(Y1)并联,这样一旦有输入信号(超过一个扫描周期),就能保持(Y1)有输出。要注意的是,自锁电路必须有解锁设计,一般在并联之后采用某一动断触点作为解锁条件。如图6-16中的X0触点。
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