GE产品IC693LBR302

GE产品IC693LBR302

梯形图的每个水平线称为一条“路线”（或称“程式线”），每个垂直线称为一个“逻辑元件”，通常包括常开/常闭接点、触发器、计数器、计时器等。逻辑元件在梯形图中的位置表示它们的逻辑关系和运行顺序。

在梯形图中，常开接点用一个正常闭合的接点表示，常闭接点用一个正常断开的接点表示。逻辑元件之间的线路可以连接、断开和分叉，分叉的线路表示并联逻辑，连接的线路表示串联逻辑。

梯形图中可以使用多个块（或称“子程序”）来表示不同的功能或不同的阶段，块通常以开始和结束的标记为界限，块内部的逻辑与梯形图一样，也需要按照从上至下、从左至右的顺序进行。

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