基于plc的排水系統(tǒng)控制設(shè)計(jì)-畢業(yè)論文(已修改)

　

【正文】 鞍山科技大學(xué)本科生畢業(yè)設(shè)計(jì)（論文） 　　　　　　　　　　第 I 頁(yè) 基于 PLC 的污水坑水位控制系統(tǒng)設(shè)計(jì)摘 要PLC（可編程邏輯控制器）是一種基于數(shù)字計(jì)算機(jī)技術(shù)、專(zhuān)為工業(yè)環(huán)境下應(yīng)用而設(shè)計(jì)的電子系統(tǒng)。它具有功能強(qiáng)大、使用可靠、維修簡(jiǎn)便等許多優(yōu)點(diǎn)。由于可編程序控制器安全性高、功能完善、性能穩(wěn)定、應(yīng)用廣泛，因此，污水坑水位控制系統(tǒng)中的控制部分采用可編程序控制器來(lái)控制。在本系統(tǒng)中，采用西門(mén)子 S7200 型 PLC 控制潛水泵的起停，其中 PLC 選用 DC24V 輸入、DC24V 繼電器輸出。污水坑水位控制系統(tǒng)的操作方式分為手動(dòng)方式和自動(dòng)方式。本課題主要任務(wù)是自動(dòng)控制方式部分，用 4 個(gè)水位開(kāi)關(guān)檢測(cè)污水坑的水位，PLC 根據(jù)水位情況控制潛水泵的起停。該設(shè)計(jì)中采用 4臺(tái)潛水泵循環(huán)工作方式取代了通常的 3 用 1 備工作方式，更加合理的分配了潛水泵的起停，提高了每臺(tái)潛水泵的利用率，避免了電動(dòng)機(jī)的頻繁啟動(dòng)，對(duì)電動(dòng)機(jī)的保護(hù)也更加完善。最后通過(guò)編程實(shí)現(xiàn)自動(dòng)控制。關(guān)鍵詞：水位控制，潛水泵，PLC鞍山科技大學(xué)本科生畢業(yè)設(shè)計(jì)（論文）　　　　　　　　　　第 II 頁(yè) The Design of Sewage Pit Water Level Control System Based on PLCAbstractPLC (programmable logic controller) is one kind of electronic system based on technology of digital puter, and designed specially for using in industrial environment. It has many merits such as powerful function, reliable use and easymending. With the rapid development of microelectronic and puter technology, PLC has widely used in industrial control area. Because the PLC is safe, stable, reliable, and applied widely, the PLC is used as the controller for the sewage pit water level control system. In this system, using Simens S7200 PLC to control the start and stop of diving pumps, in which PLC selects DC24V of input, DC24V relay of outputs, and has DC24V voltagestabilized source. The sewage pit water level control system operating mode divides into the manual way and automatic way. This topic primary mission is the automatic control way, with 4 water level switch examining sewage pit water level, PLC according to the water level situation control the start and stop of diving pumps. To instead of past method which three pumps is working and one is for ready, the new cycle work method is applied in this design. It makes the start and stop of the diving pumps more reasonable. And at the same time, it makes the diving pumps work more efficiently and avoids to start the electric motors frequently. So the electric motor can be better protected. At the end the LAD program of the sewage pit water level control system is provided.Key words：water level control, diving pumps, PLC鞍山科技大學(xué)本科生畢業(yè)設(shè)計(jì)（論文）　　　　　　　　　　第 III 頁(yè) 目 錄摘 要 .........................................................................................................................................IAbstract ......................................................................................................................................II1 緒論 .........................................................................................................................................1 PLC 的現(xiàn)狀與趨勢(shì) ...........................................................................................................1 PLC 的特點(diǎn)與應(yīng)用 ...........................................................................................................1 PLC 與其它工業(yè)控制系統(tǒng)的比較 ...................................................................................3 與集散控制系統(tǒng)的比較 ............................................................................................3 與工業(yè)微機(jī)控制系統(tǒng)的比較 ....................................................................................3 變頻調(diào)速技術(shù)的特點(diǎn) ......................................................................................................4 設(shè)計(jì)的主要任務(wù) ..............................................................................................................42 可編程序控制器概述 .............................................................................................................6 可編程控制器的工作方式 ..............................................................................................6 可編程控制器的工作原理 ........................................................................................6 可編程控制器的掃描周期 ........................................................................................8 編程軟件的簡(jiǎn)介和梯形圖的設(shè)計(jì)方法 ........................................................................103 污水坑水位控制設(shè)計(jì) ...........................................................................................................12 原控制系統(tǒng)設(shè)計(jì)方案 ....................................................................................................12 控制系統(tǒng)的改造設(shè)計(jì)方案 ............................................................................................124 控制系統(tǒng)硬件選擇和程序設(shè)計(jì) ...........................................................................................15 PLC 的選型 .....................................................................................................................15 S7200 型 PLC 的特點(diǎn) ...................................................................................................15 輸入、輸出點(diǎn)的確定 ....................................................................................................15 控制系統(tǒng)程序設(shè)計(jì) ........................................................................................................15 控制系統(tǒng)的自動(dòng)控制方式工作過(guò)程 ......................................................................15 程序設(shè)計(jì)框圖 ..........................................................................................................21 程序設(shè)計(jì)梯形圖 ......................................................................................................21結(jié) 論 .......................................................................................................................................23致 謝 .......................................................................................................................................24鞍山科技大學(xué)本科生畢業(yè)設(shè)計(jì)（論文）　　　　　　　　　　第 IV 頁(yè) 參考文獻(xiàn) ...................................................................................................................................25附錄 A Introduction of Programmable Controllers...............................................................26附錄 B 可編程序控制器介紹 ...............................................................................................31附錄 C PLC 程序設(shè)計(jì)梯形圖 .................................................................................