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本次设计的课题是基于PLC的液位控制系统的设计。在设计中，笔者主要负责的是控制算法的设计，因此在论文中设计用到的PID算法提到得较多。
本文的主要内容包括：水箱的特性确定与实验曲线分析， S7-300可编程控制器的硬件掌握，PID参数的整定及各个参数的控制性能的比较，应用PID控制算法所得到的实验曲线分析，整个系统各个部分的介绍和应用PLC语句编程来控制水箱水位。
关键词：S7-300西门子PLC、控制对象特性、PID控制算法、扩充临界比例法、压力变送器、电动调节阀、PID指令。
This graduation project topic is based on the PLC fluid position control system design. In the design, I am control the algorithm which the author primary cognizance the design, therefore designs in the paper with to the PID algorithm mentions many.
The this article main content includes: water tank characteristic determination and experimental curve analysis，the S7-300 programmable controller hardware grasps，PID parameter installation and each parameter control performance comparison，experimental curve analysis obtains which using the PID control algorithm and overall system each part of introduction and programs using the PLC sentence controls the water tank water level.
Key words: SIMATIC S7-300 PLC, the controlled member characteristic, the PID control algorithm, the expansion critical ratio method, the pressure change delivering, the electrically operated regulating valve.
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