本文介绍PLC在供水控制系统中的应用，阐述了根据控制电路组成及操作工艺要求，进行的电气原理图设计和系统程序设计。
This paper introduces the application of PLC in water supply control system, explains the design of the electric principle diagram and the system program design.
提出了电气原理图的智能化设计方法。
Propose methods of intelligent design of electrical circuit drawing.
因此，研究电气原理图识别与智能化设计方法并开发相应的电气CAD系统是一项非常有意义的工作。
Therefore, doing research about the method of electrical circuit drawing recognition and intelligent design and developing a corresponding CAD system is a significant and valuable work.
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