In the process of PLC control program design,it is often necessary to maintain the pulse input signal or the input signal of the jog button,and a self-locking circuit is often used at this time.The basic form of the self-locking circuit is shown in the figure.The input contact(X1)is connected in parallel with the moving contact(Y1)of the output coil,so that once there is an input signal(more than one scan cycle),the output(Y1)can be maintained.It should be noted that the self-locking circuit must have an unlocking design.Generally,a moving break contact is used as the unlocking condition after parallel connection.
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
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