按下起动按钮SB2，X000接收外部信号置“1”，Y000置“1”并自锁，自锁的目的是当起动按钮SB2松开，X000置“0”时，Y000仍然能保持置“1”状态，使电动机连续运行。需要停车时，按下停止按钮SB1，X001常闭触电置“0”，断开Y000，使Y000置“0”，使电动机停止运行。其相应的控制梯形图如图1所示：

程序清单：

LD  X000

OR  Y000

ANI  X001

OUT  Y000

END

电动机起动、自保持及停止控制电路是梯形图中较典型的单元，它包含了梯形图程序的全部要素，具体体现如下几点：

1．事件：每一个梯形图支路都针对一个事件。事件用输出线圈表示，本例中为Y000。

2．事件发生的条件：梯形图支路中除了线圈外还有触点的组合，使线圈置“1”的条件即是事件发生的条件，本例中为起动按钮SB2使X000“1”。

3．事件得以延续得条件：触点组合中使线圈置“1”得以保持得条件是与X000并联得Y000自锁触点闭合。

4．使事件终止的条件：触点组合中使线圈置“1”中断的条件。本例中为停止按钮SB1使X001常闭触点断开。

 

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