【正文】 ... 5 可編程控制器（ PLC）的特點(diǎn) .................................................................................................... 6 可編程控制器（ PLC）的應(yīng)用 .................................................................................................... 7 可編程控制器（ PLC）的組成 .................................................................................................... 7 可編程控制器的工作方式及過(guò)程 ............................................................................................. 11 可編程控制器的編程語(yǔ)言 —— 梯形圖 .................................................................................... 13 第三章 系統(tǒng)硬件設(shè)計(jì) ........................................................................................................................... 15 恒壓供水系統(tǒng)的基本構(gòu)成 ...................................................................................................... 18 系統(tǒng)控制要求 ........................................................................................................................... 20 控制系統(tǒng)的 I/O 點(diǎn)及地址分配 .............................................................................................. 21 系統(tǒng)選型 .................................................................................................................................... 22 PLC 模擬量控制單元的配置以及應(yīng)用 ................................................................................... 23 EM235模擬量工作單元性能指標(biāo) .................................................................................. 23 校準(zhǔn)及配置 ...................................................................................................................... 25 EM235的安裝使用 ........................................................................................................... 25 電氣控制系統(tǒng)原理圖 ...................................................................................................... 26 第四章 系統(tǒng)程序設(shè)計(jì) ........................................................................................................................... 28 由“恒壓 ” 要求出發(fā)的工作泵組數(shù)量控制管理 ................................................................... 28 多泵組泵站泵組管理規(guī)范 ......................................................................................................... 28 程序的結(jié)果以及程序功能的實(shí)現(xiàn) ............................................................................................ 28 第 5 章 總結(jié) ........................................................................................................................................... 42 系統(tǒng)的優(yōu)點(diǎn) .................................................................................................................................. 42 結(jié)束語(yǔ) ........................................................................................................................................... 42 參考文獻(xiàn) .................................................................................................................................................. 44 致 謝 ........................................................................................................................................................ 45 第 1章 緒論 1 1 第 1 章 緒論 課題背景及意義 眾所周知，水是人類生活、生產(chǎn)中不可缺少的重要物質(zhì)，在節(jié)水節(jié)能已成為時(shí)代特征的現(xiàn)實(shí)條件下，我們這個(gè)水資源和電能短缺的國(guó)家，長(zhǎng)期以來(lái)在市政供水、高層建 筑供水、工業(yè)生產(chǎn)循環(huán)供水等方面技術(shù)一直比較落后，自動(dòng)化程度低，而隨著我國(guó)社會(huì)經(jīng)濟(jì)的發(fā)展，人們生活水平的不斷提高，以及住房制度改革的不斷深入，城市中各類小區(qū)建設(shè)發(fā)展十分迅速，同時(shí)也對(duì)小區(qū)的基礎(chǔ)設(shè)施建設(shè)提出了更高的要求。 ③ simple operation, easy to use, well received by engineers and technicians wele [4]。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 shortings. 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, workintensive 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 lowcarbon 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 英文 摘要 2 equipment and automation projects, the relay can not be pared. As puter technology continues to evolve, it has brought a revolutionary change to the industrial automation. This change is controlled by relays to the putercontrolled leap. PLC control is characterized by: ① high reliability, strong antijamming capability。s social and economic development, housing system reform in depth, and continuous improvement of people39。最終完成基于 PLC的水塔水位控制系統(tǒng)的設(shè)計(jì)。 本文首先闡述了課題背景，在分析了當(dāng)前研究中存在的問(wèn)題的基礎(chǔ)上，論 述了本課題研究的重要意義。傳感器技術(shù)和數(shù)據(jù)采集，設(shè)計(jì)一套實(shí)用水位控制方案，使系統(tǒng)實(shí)現(xiàn)自動(dòng)控制，以提高控制精度、可靠性和供水質(zhì)量。 ④系統(tǒng)的設(shè)計(jì)、建造工作量小，維護(hù)方便、易于改造；⑤體積小、質(zhì)量輕、功耗低。這個(gè)變革是由繼電器控制到計(jì)算機(jī)控制的飛躍 。 在現(xiàn)代工業(yè)設(shè)備及自動(dòng)化項(xiàng)目中， PLC的可靠性、抗干擾性等諸因素是繼電器無(wú)法比擬的。所以除了浪費(fèi)電能外，還造成了人力資源的浪費(fèi)。在水資源日益匱乏的今天，節(jié)約用水、提高水資源的利用率就顯得十分必要。傳統(tǒng)的恒速泵加壓供水、水塔高位水箱供水、氣壓罐供水等供水方式普遍不同程度的存在效率低、可靠性差、自動(dòng)化程度不高等缺點(diǎn)，難以滿足當(dāng)前經(jīng)濟(jì)生活的需要。吉林工程技術(shù)師范學(xué)院畢業(yè)論文 1 摘要 隨著我國(guó)社會(huì)經(jīng)濟(jì)的發(fā)展，住房制度改革的不斷深入，人們生活水平的不斷提高，城市中各類小區(qū)建設(shè)發(fā)展十分迅速，同時(shí)也對(duì)小區(qū)的基礎(chǔ)設(shè)施建設(shè)提出了更高的要求。小區(qū)供水系統(tǒng)的建設(shè)是其中的一個(gè)重要方面，供