The advantage function in PLC is stepping sequence control, the efficiency method of establishment the stepping sequence control program is drawing out the function diagram.

步进顺序控制是可编程序控制器的优势功能，编制步进顺序控制程序的有效方法是画出功能表图。

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By this method, the middle logic operation control process is omitted. The method is particularly suitable for complicated sequence program control as the programming is digitalized.

省去了中间逻辑运算控制环节，这对复杂的顺序程序控制尤为适应，使得顺序程序控制编程数据化。

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