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介绍了可编程控制器（ＰＬＣ）梯形图程序的顺序控制设计法，顺序功能图的基本结构及其转换实现的基本规则。在实际工程中，采用起动－保持－停止电路的顺序控制梯形图的设计方法设计的控制程序具有实现方便、容易掌握、可读性强等优点，可用来设计复杂系统的梯形图及用于各种型号的ＰＬＣ。
This paper introduces the sequence control design method of PLC ladder program, the basic structure of sequential function chart and the basic rules of its transformation. In practical engineering, the control program designed by using the sequential control ladder diagram of start-stop-stop circuit has the advantages of easy realization, easy to grasp and strong readability. It can be used to design the ladder diagram of complex systems, The type of PLC.