PLC水塔水位控制系统 毕业论文.doc

吉林工程技术师范学院毕业论文 摘要随着我国社会经济的发展，住房制度改革的不断深入，人们生活水平的不断提高，城市中各类小区建设发展十分迅速，同时也对小区的基础设施建设提出了更高的要求小区供水系统的建设是其中的一个重要方面，供水的经济性、可靠性、稳定性直接影响到小区住户的正常生活和工作，也直接体现了小区物业管理水平的高低传统的恒速泵加压供水、水塔高位水箱供水、气压罐供水等供水方式普遍不同程度的存在效率低、可靠性差、自动化程度不高等缺点，难以满足当前经济生活的需要水塔水位控制系统是我国住宅小区广泛应用的供水系统，传统的控制方式存在控制精度低、能耗大的缺点在水资源日益匮乏的今天，节约用水、提高水资源的利用率就显得十分必要传统的水塔水位控制为粗放式的，基本没有对水泵的合理控制，且多为人为控制，工作强度大、危险所以除了浪费电能外，还造成了人力资源的浪费采用新型的PLC控制供水方式与过去旧的控制方式相比在运行中的经济性、可靠性、稳定性、等方面有显著优势，特别是在提倡低碳的情况下有很好的节能效果，且由于PLC强大的扩展性可以适应今后城市供水建设的发展在现代工业设备及自动化项目中，PLC的可靠性、抗干扰性等诸因素是继电器无法比拟的。

随着计算机技术的不断发展，它给工业自动化带来了革命性的变革这个变革是由继电器控制到计算机控制的飞跃利用PLC控制的特点是：①可靠性高，抗干扰能力强；②配套齐全，功能完善，适用性强；③操作简单，易学易用，深受工程技术人员欢迎[4]; ④系统的设计、建造工作量小，维护方便、易于改造；⑤体积小、质量轻、功耗低 因此综上所述，为了达到节能的目的提高供水系统的质量，考虑采用可编程控制器（PLC）、继电器传感器技术和数据采集，设计一套实用水位控制方案，使系统实现自动控制，以提高控制精度、可靠性和供水质量并通过模拟仿真来验证程序编写的正确性 本文首先阐述了课题背景，在分析了当前研究中存在的问题的基础上，论述了本课题研究的重要意义并根据水塔水位控制系统的控制要求以及控制原理确定水塔水位控制系统的硬件设计，画出系统流程图，确定PLC系统的输入输出分配，编写程序，系统的模拟仿真等最终完成基于PLC的水塔水位控制系统的设计关键字：PLC 自动控制 供水系统1吉林工程技术师范学院毕业论文 AbstractWith China's social and economic development, housing system reform in depth, and continuous improvement of people's living standard, various types of residential construction and development in the city very quickly, but also put forward higher requirements for the district's infrastructure. The construction of the residential water supply system is one of the important aspects of water supply in the economy, reliability, stability directly affect the normal life and work of the district households, but also directly reflects the level of residential property management. The traditional constant speed pump pressurized water towers high tank water supply, pressure tank, water supply, water supply universal presence of varying degrees of efficiency, reliability, degree of automation of the disadvantages, it is difficult to meet the needs of the current economic life.The water tower water level control system is widely used in water supply systems in residential area in China, the traditional control method, control accuracy and low energy consumption shortcomings. Increasing water scarcity, water conservation, and improve the utilization of water resources, it is very necessary. Traditional water tower water level control for the extensive, basic the reasonable control of the pumps, and artificial control, work-intensive and dangerous. So in addition to a waste of energy, but also cause the waste of human resources. New PLC control the water supply with the old control in the operation of the economy, reliability, stability, etc. have a significant advantage, especially in promoting low-carbon good energy saving effect. and PLC powerful scalability can be adapted to the construction of urban water supply in the future.PLC reliability, interference immunity and other factors in the modern industrial equipment and automation projects, the relay can not be compared. As computer technology continues to evolve, it has brought a revolutionary change to the industrial automation. This change is controlled by relays to the computer-controlled leap. PLC control is characterized by: ① high reliability, strong anti-jamming capability; 2 is complete, fully functional, and applicability; ③ simple operation, easy to use, well received by engineers and technicians welcome [4]; ④ The system design small amount of work to build, easy maintenance, easy to transform; ⑤ The small size, light weight, low power consumption.    In summary therefore, in order to save energy to improve the quality of the water supply system, consider using programmable logic controller (PLC) and relays. Sensor technology and data acquisition, to design a practical level control scheme, allowing the system to achieve automatic control in order to improve control accuracy, reliability, and quality of the water. And by simulation to verify the correctness of the programming.    This paper first describes the subject of background, on the basis of analysis of the problems in the current study, on theDescribes the significance of this research project. And under the control of the water tower level control system requirements, and control principle to determine the water tower level control system hardware design, draw a system flow chart to determine the allocation of input and output of the PLC system, the preparation procedure, the system simulation. The final completion of the water tower water level of the PLC-based control system design.Keywords: PLC automatic control water supply system目录第1章 绪论 11.1课题背景及意义 11.2 水塔水位控制系统的组成 21.3数控系统概述 2第2章 可编程控制器（PLC）概述 52.1 可编程控制器简介 52.2可编程控制器（PLC）的特点 62.3可编程控制器（PLC）的应用 72.4可编程控制器（PLC）的组成 72.5可编程控制器的工作方式及过程 112.6 可编程控制器的编程语言——梯形图 13第三章 系统硬件设计 153.1 恒压供水系统的基本构成 183.2 系统控制要求 203.3 控制系统的I/O点及地址分配 213.4 系统选型 223.5 PLC模拟量控制单元的配置以及应用 233.5.1 EM235模拟量工作单元性能指标 233.5.2 校准及配置 253.5.3 EM235的安装使用 253.5.4 电气控制系统原理图 26第四章 系统程。