基于plc双恒压供水控制系统设计毕业论文.docVIP

基于PLC的双恒压供水控制系统设计 摘 要 近些年来随着可编程控制器快速发展，可编程控制器已广泛应用于各个领域。本论文设计了一种基于PLC的双恒压供水系统，该系统由一台PLC、一台水泵、一个水塔、六个液位传感器等构成。 双恒压供水控制系统的基本控制策略是：采用可编程控制器(PLC)构成控制系统，进行优化控制水泵，并自动调整水泵运行的台数，完成水塔水位的控制。当水塔中的液位发生变化时,根据液位传感器的信号，PLC自动控制水泵的运行台数，系统的控制目标是水塔的水位。 手动控制，值班人员通过按钮手动控制水泵，使液位控制在一定的范围之内，实现手动恒压供水。根据恒压供水系统设计的需求，力求做到使系统运行稳定，操作简便，解决水塔的双恒压供水的问题，保证供水安全、快捷、可靠。恒压供水保证了供水质量，PLC控制系统丰富了供水系统的控制功能，提高了系统的可靠性。 关键词：PLC，恒压供水系统，液位传感器，水塔 DESIGN OF DOUBLE CONSTANT-PRESSURE SUPPLYING WATER CONTROL SYSTEM BASED ON PLC ABSTRACT In recent years, with the rapid development of Programmable Logic Controller, it has been widely used in various fields. A kind of Double Constant-pressure Supplying Water Control System is designed in this paper. The system is constituted of a PLC, three pumps, a Water Tower , six Liquid Level Sensors and so on. A relay control system is constituted of the use of Programmable Logic Controller (PLC), it is optimizing the control of pumps. This is the basic control strategy of Constant Pressure Water Supply Control System, the pumps has been controlled. When the level is changed of the towers, the pumps are controlled by PLC automatic control signals in accordance with liquid level sensor. The water level in the towers is controlling objectives. Controlling by the hands, the On Duty controls the pumps through the manual control button, so that a certain level could be controlled within the scope of. According to the requirement of the Constant Pressure Water Supply System, we could achieve a stable system operation and operate easily. The problem of Constant Pressure Water Supply dual towers is solved. The quality of the water is the protection. PLC Control System enriches the control functions of the Water Supply System, and improves the reliability of the system. Key words: PLC，constant pressure water supply system，liquid level sensor，water tower 1. 绪论 自动化技术是当今几大高新技术之一，从某种意义来说，自动化技术已成为现代化的代名词。随着我国产业结构的调整，现代化进程的加快，自动化技术对现代工业生产的推动作用将越来越重要。随着各类工业企业的技术进步，工业自动化生产必将得到广泛的普及，电气控制设备、自动化生产线的