【正文】 Controlled System Based on PLC Abstract With the quickening pace of urban modernization, urban sewage treatment control system has increasingly been developed and improved. The urban sewage treatment control system is a very important part of the urban modernization. It has the vital significance to improve the image of cities ,to improve people’s life and to protect the environment. The paper discusses the important application of the PLC control system in the urban sewage treatment system. And the process of the design named SBR sewage treatment automatic control system is introduced in detail in the paper. The system which consists of the design of ladder diagram and the design of configuration, has realized the automatic control and the remote monitoring of the small and medium cities. The system mainly includes the PLC、 the liquid level sensor、 the water pump、the water decanter、 the pump into the mud and the mud pump. The system has two control mode including the manual and the automatic ones to control the field on the ladder language. The system design the monitoring interface by the MCGS configuration, which can not only simulate the working condition of the demo system, but also monitor the working condition at a realtime. Besides, the interface can control the system remotely and finish the automatic operation of the method named the SBR sewage treatment. Problem can be found in time when the system goes wrong, and the system will stop working, then maintenance is needed to reduce the accidents in the process of the sewage treatment. Keywords： PLC。系統(tǒng)主要由 PLC、液位傳感器、進(jìn)水泵、潷水器、進(jìn)泥泵及抽泥泵組成，分為手動和自動兩種控制方式，使用梯形圖語言完成系統(tǒng)對現(xiàn)場的控制；使用 MCGS 監(jiān)控組態(tài)軟件設(shè)計監(jiān)控界面，不僅可以模擬演示系統(tǒng)工作狀況，而且還可以對現(xiàn)場工作情況進(jìn)行實時監(jiān)控，并對系統(tǒng)進(jìn)行遠(yuǎn)程控制，完成 SBR 污水處理法的自動運行 。 本文論述了 PLC 控制 系統(tǒng)在城市污水處理中的重要應(yīng)用，詳細(xì)介紹了 SBR污水處理法自動控制系統(tǒng)的設(shè)計過程。 畢 業(yè) 設(shè) 計 設(shè)計題目： 基于 PLC 的城市污水處理控制系統(tǒng)設(shè)計 系 別： 信息工程系 班 級： 電子信息工程 基于 PLC 的城市污水處理控制系統(tǒng)設(shè)計 摘 要 隨著城市現(xiàn)代化建設(shè)步伐的加快，城市污水處理控 制系統(tǒng)也日益發(fā)展和完善 。 城市污水處理控制系統(tǒng)是城市現(xiàn)代化建設(shè)的重要組成部分，對提高城市形象，改善人民生活，保護(hù)環(huán)境具有重要的意義。 本 系統(tǒng)包括梯形圖設(shè)計和監(jiān)控組態(tài)設(shè)計兩個方面，實現(xiàn) 了 中小型城市的污水處理自動控制和遠(yuǎn)程監(jiān)控。當(dāng)系統(tǒng) 發(fā)生狀況時 ，能夠 及時發(fā)現(xiàn)，并停止系統(tǒng)，進(jìn)行檢 修，減少污水處理過程中事故的發(fā)生。 urban sewage treatment。 SBR 目 錄 1 緒 論 .......................................................................................................................... 1 設(shè)計背景 ............................................................................................................. 1 研究目的和意義 ................................................................................................. 1 污水處理現(xiàn)狀 ..................................................................................................... 2 主要設(shè)計內(nèi)容 ..................................................................................................... 3 2 污水處理工藝流程 .................................................................................................... 4 常用的污水處理工藝 ......................................................................................... 4 SBR 法過程闡述 .................................................................................................. 7 3 硬件設(shè)計 .................................................................................................................... 8 PLC 的介紹 .......................................................................................................... 8 PLC 的結(jié)構(gòu) ................................................................................................... 8 PLC 的工作原理 ........................................................................................... 9 PLC I/O 口分配 ........................................................................................... 11 SBR 法的總體設(shè)計 ............................................................................................ 12 方案設(shè)計 ..................................................................................................... 12 硬件電路設(shè)計 ............................................................................................. 13 其他資源配置 ................................................................................................... 15 接觸器選型 ................................................................................................. 15 液位計選型 ................................................................................................. 15 潷水器選型 ................................................................................................. 15 4 軟件設(shè)計 .................................................................................................................. 17 PLC 程序設(shè)計分析 ............................................................................................ 17 整體設(shè)計流程 ............................................................................................. 17 手動設(shè)計流程 ............................................................................................. 17 自動設(shè)計流程 ............................................................................................. 18 上位機(jī)界面設(shè)計 ............................................................................................... 24 組態(tài)軟件的介紹 ......................................................................................... 24 設(shè)計要求及效果 ......................................................................................... 25 定義數(shù)據(jù)對象 ............................................................................................. 26 主界面的設(shè)計 ............................................................................................. 26 實時報警 ..................................................................................................... 28 設(shè)備連接 ..................................................................................................... 29 腳本程序介紹 ...................