Sequential function diagram (SFD) is a relatively new programming method. It divides a complete control process into several stages. Each stage has different actions. There are certain conversion conditions between stages. When the conversion conditions are met, the stage transfer is realized. The action of the previous stage ends and the action of the next stage begins. It provides a graphical method to organize programs. Step, path and transformation are the three main elements of SFD. The sequence function diagram is mainly used to describe the switching sequence control system, according to which it is easy to draw the sequence control ladder program.<br>
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