Third, the design of application program is presented.
然后，介绍了应用程序的开发。
Good result was achieved in design of application program.
在应用程序设计中使用，效果良好。
This article introduces the frequency speed constant pressure water supply system controlled by PLC, presenting its hardware structure, the design of PLC program and its application.
介绍了用PLC控制的变频调速恒压供水系统的基本原理，给出了系统的电气线路和PLC程序设计，并在实际中得到了应用。
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