【正文】 ed 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。 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(dòng)控制系統(tǒng)的設(shè)計(jì)過(guò)程。 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(duì)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。當(dāng)系統(tǒng) 發(fā)生狀況時(shí) ，能夠 及時(shí)發(fā)現(xiàn)，并停止系統(tǒng)，進(jìn)行檢 修，減少污水處理過(guò)程中事故的發(fā)生。 SBR 目 錄 1 緒 論 .......................................................................................................................... 1 設(shè)計(jì)背景 ............................................................................................................. 1 研究目的和意義 ................................................................................................. 1 污水處理現(xiàn)狀 ..................................................................................................... 2 主要設(shè)計(jì)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(guò)程闡述 .................................................................................................. 7 3 硬件設(shè)計(jì) .................................................................................................................... 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(jì) ............................................................................................ 12 方案設(shè)計(jì) ..................................................................................................... 12 硬件電路設(shè)計(jì) ............................................................................................. 13 其他資源配置 ................................................................................................... 15 接觸器選型 ................................................................................................. 15 液位計(jì)選型 ................................................................................................. 15 潷水器選型 ................................................................................................. 15 4 軟件設(shè)計(jì) .................................................................................................................. 17 PLC 程序設(shè)計(jì)分析 ............................................................................................ 17 整體設(shè)計(jì)流程 ............................................................................................. 17 手動(dòng)設(shè)計(jì)流程 ............................................................................................. 17 自動(dòng)設(shè)計(jì)流程 ............................................................................................. 18 上位機(jī)界面設(shè)計(jì) ............................................................................................... 24 組態(tài)軟件的介紹 ......................................................................................... 24 設(shè)計(jì)要求及效果 ......................................................................................... 25 定義數(shù)據(jù)對(duì)象 ............................................................................................. 26 主界面的設(shè)計(jì) ............................................................................................. 26 實(shí)時(shí)報(bào)警 ..................................................................................................... 28 設(shè)備連接 ..................................................................................................... 29 腳本程序介紹 ............................................................................................. 32 5 調(diào)試 .......................................................................................................................... 35 模擬調(diào)試 ........................................................................................................... 35 硬件功能性調(diào)試 ............................................................................................... 40 系統(tǒng)總體調(diào)試 ................................................................................................... 40 6 結(jié)論 ................................................................................................