基于PLC的水位控制系统毕业设计与实现.doc

基于PLC的水位控制系统毕业设计与实现 基于PLC的水位控制系统设计与实现 摘 要 随着社会进步和经济的迅速发展，人们对住房条件要求的提高，高位生活用水和工业用水逐渐增多，传统的控制方法已经落后。以前采用人工进行控制蓄水池的水位，由于不可能每时每刻对水位进行准确的定位监测，并且带有很大的主观性，所以很难准确控制水泵电机的启停，并且大多数供水系统采集信息数量少、处理慢、传递迟，难以实现设备之间及系统与外界之间的信息交换，严重制约了企业信息集成及企业综合自动化的实现。计算机和自动控制技术不断进步使得高性能的供水系统的开发成为可能。因此，研究高性能、网络化的供水监控系统，对降低能耗、信息共享具有重要的现实意义。 本设计主要介绍了以可编程逻辑控制器（C20P型PLC）与变频器为核心的控制系统，实现了对水塔水位的远程控制，并且实现了低警戒水位的报警。本设计对其控制原理、硬件选择、软件设计、报警电路进行重点阐述，使软件程序的设计简单化，硬件接口简易可行，特别是提高了整个系统的稳定性和抗干扰能力。 本系统对传统的供水系统进行改造，可以有效的解决以前供水压力波动大、系统故障率高、能源浪费严重等一系列问题。同时，系统具有自动和手动两种控制方式，便于对系统进行维护修理，并能通过应用软件对供水系统进行监控和远距离控制，提高效率，实现自动化供水。 关键字：PLC，变频器，自动控制 Control system design and realizes PLC-based water level ABSTRACT With social progress and rapid economic development, people have requested the improvement of housing conditions, high domestic water and industrial water gradually increased, the traditional control method has lagged behind. Before using artificial control of the reservoir water level, because every time the water level can not make accurate positioning monitoring, and a lot of subjectivity, it is difficult to accurately control the motor from the pump stopped; most of the water supply system and a small number of information collection, processing slow, late delivery, difficult to achieve between devices and systems and the exchange of information between the outside world, has seriously hampered enterprise information integration and the realization of integrated automation business. Computer and automatic control technology makes high-performance continuous improvement of the water supply system for possible. This paper presents a programmable logic controller C20P-PLC with an inverter at the core of the control system and realized the water towers on the remote control and achieved a low warning level of alarm. In this paper, its control principle, the choice of hardware, software design, focus on alarm circuits, software programs simplify the design, hardware interface simple and feasible