单容水箱液位恒值控制系统设计 毕业设计.doc

毕业设计（论文） 单容水箱液位恒值控制系统设计 摘要 本文根据液位系统过程原理，建立了单容水箱的数学模型。在设计中用到的PID算法。本文的主要内容包括：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PLC的过程控制指令PID指令来控制水箱水位。MCGS(监视与控制通用系统)是用于快速构造上位机监控系统的组态软件系统，过程控制是指对温度、压力、流量等模拟量的闭环控制。作为工业控制计算机，PLC能编制各种各样的控制算法程序，完成闭环控制。PID调节是一般闭环控制系统中用得较多的调节方法。大中型PLC都有PID模块，目前许多小型PLC也具有此功能模块。PID处理一般是运行专用的PID子程序。过程控制在冶金、化工、热处理、锅炉控制等场合有非常广泛的应用。 Abstract According to the principle of level system process to establish a mathematical model of the single-tank water. PID algorithm and PLC knowledge used in the de- sign. PID level control analog interface and algorithm, system simulation, and tun- ing PID parameters, obtained after setting the simulation curve and the actual curve.The main content of this paper include: PLC generation and definition, development of process control, S7-200 programmable controller hardware grasp the comparison of the performance of PID parameter tuning and parameter control, PID control algorithm experimental curve analysis, part of the introduction of the entire system and explain the PLC process control tank water level control instructions PID instruction. PLC in a wide range of industrial automation applications. PID control after a very long period of development, has become an important means of control in the indus- try. The design is based on PLC PID algorithm to control the liquid level. PLC via the sensing circuit, the height of liquid acquisition, and then after the automatic adjustment After the PID parameters is determined to achieve a liquid level control, through the control of the working time of the DC pump. MCGS (monitoring and control of the general system) configuration PC monitoring system for the rapid construction of software systems, the monitoring aspects of the system design by MCGS. So that we can through the configuration screen of the liquid level and pump start and stop monitoring the PLC and can start, stop, set the height of liquid level control. Entire system is st