说明：  这篇文档是学习西门子系列软件的重要教材,是西门子编程的入门教材,通过学习可以使你掌握西门子的编程要点.
(This document is learning Siemens important textbook series software is the entry-Siemens programming materials, through the study will enable you to master the programming elements of Siemens.)