本文以西门子s7 - 200型号PLC为例，用一个具体的实例介绍了PLC梯形图的三种顺序控制设计方法。
This paper introduces three sequential control design methods of PLC ladder diagram with an example, which based on the example of the kind of S7-200 PLC from SIEMENS.
顺序控制设计法是设计PLC梯形图的一种先进规范的方法和有力工具。
Sequential control design method is an advanced (regular) design method for design of PLC ladder diagram, and it is a powerful tool.
软件编程方法采用顺序控制设计法，并根据此方法设计了压块机自动控制系统的梯形图。
As for the software design, the paper takes advantage of the sequence controlling design programming, and designs the ladders diagram of the automatic controlling system with this method.
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