1、I 摘摘 要要 随着社会市场经济的不断发展， 人们对供水质量和供水系统可靠性的要求不断提 高；再加上目前能源紧缺，利用先进的自动化技术、控制技术以及通讯技术，设计高 性能、高节能、能适应不同领域的恒压供水系统成为必然的趋势。 首先，介绍了当前国内外恒压供水系统的发展情况，并提出不同的控制方案，通 过研究和比较，详细说明了恒压供水系统的工作原理。本文采用变频器和 PLC 实现 恒压供水和数据传输，然后用数字 PID 对系统中的恒压控制进行设计。 其次，详细陈述了基于 PLC 变频恒压供水系统工程的方案设计，包括系统的硬件 和软件设计，并对系统采取了可靠性措施进行了说明。 最后，结合 MCGS 组
2、态软件对所设计的电路和程序进行了仿真、调试。 结果表明，所设计的硬件电路及程序运行可靠，极大地提高了供水的质量，并且 节省了人力，具有明显的经济效益和社会效益，能够满足用户恒压供水的要求。 关键词关键词：变频器，恒压供水，PLC，MCGS，压力传感器 II Abstract With the rapid development of socialistic marketing economy,there is a growing demand for better quality of water supply and higher reliability of supply system.
3、In addition ,considering the current common energy crisis, achieving the scheme of automatingthe water supply system. So it is an inevitable tendency to design and create an energy-savingconstant-pressure water supply system of excellent performance with the help of advancedtechniques of automation,
4、monitor-control system; and communication. Meanwhile, the System can also adapt to various water Supply regions. Firstly, this paper introduces the current situation of constant pressure water supply system, and puts forward the development situation of different control scheme, through research and
5、 comparison, detailed descriptions of constant pressure water supply system principle of work. This paper adopts inverter and PLC constant pressure water supply and data transmission, then use digital PID on system of constant pressure control design. Secondly, a detailed statement based on PLC freq
6、uency constant pressure water supply system engineering design, including the system hardware and software design of the system adopted reliability measures are presented. Finally, combined the MCGS software to design the circuit and procedures are simulated, debugging. Results show that the design of hardware circuit and program reliable operation, has greatly improved the quality of water supply, and save the human, has the obvious economic benefits and social benefits, and can satisfy the r
