西门子S7-Graph和S7-HiGraph语言的编程思路

Thoughts about the Programming Siemens S7-Graph and S7-HiGraph Languages

本文主要讨论了西门子PLC编程软件STEP7中的两种可选编程语言S7-Graph（顺序功能图）和S7-HiGraph（状态图），着重介绍了它们的编程原则和思路。同时，通过将上述两种专业编程语言与基本的梯形图语言应用于同一具体实例中的对比，总结出了它们对于其它基本编程语言的优越性。

The article mainly discusses the two optional programming languages S7-Graph （a kind of SFC） and S7-HiGraph （a kind of State Graphs） in the programming software Step 7 of Siemens PLC, the article gives an emphasis on the introduction of their programming principles and thoughts. And at the same time, by contrasting of applying the above two professional programming languages and the language basic Ladder Diagram in the same instantiation, a conclusion drawn is obtained that the two professional programming languages have many advantages over other basic programming languages, such as LAD.