【正文】 術(shù)學(xué)院畢業(yè)設(shè)計(jì)（論文） 16 六 結(jié)束語(yǔ) 1 系統(tǒng)的優(yōu)點(diǎn) 水塔水位自動(dòng)控制系統(tǒng) 因采用 PLC 控制水泵 電源 開關(guān) ， 實(shí)現(xiàn)了即使安全的完成操作。 隨著 科學(xué)技術(shù) 技術(shù)的飛速發(fā)展， 自動(dòng)控制 供水技術(shù)在小區(qū)已普遍使用。t appealed against the disciplinary action your employer has taken against you. However, if you win your case, the tribunal may reduce any pensation awarded to you as a result of your failure to appeal. Remember that in most cases you must make an application to an employment tribunal within three months of the date when the event you are plaining about happened. If your application is received after this time limit, the tribunal will not usually accept i. If you are worried about how the time limits apply to you, take advice from one of the anisations listed under Further help. Employment tribunals are less formal than some other courts, but it is still a legal process and you will need to give evidence under an oath or affirmation. Most people find making a claim to an employment tribunal challenging. If you are thinking about making a claim to an employment tribunal, you should get help straight away from one of the anisations listed under Further help. If you are being represented by a solicitor at the tribunal, they may ask you to sign an agreement where you pay their fee out of your pensation if you win the case. This is known as a damagesbased agreement. In England and Wales, your solicitor can39。 Junior high school, thought to have a crush on just means that the real growth, but over the past three years later, his writing of alumni in peace, suddenly found that isn39。t start planning... Those years, those days of do, finally, like youth, will end in our life. 此刻，天空是陰暗的，空氣里有著剛下過雨之后的清新因子 。 陜西航空職業(yè)技術(shù)學(xué)院畢業(yè)設(shè)計(jì)（論文） 22 At the moment, the sky is dark, the air is fresh factor after just rained. Suddenly thought of blue plaid shirt?；蛟S是愧疚于自己似乎把轉(zhuǎn)瞬即逝的很多個(gè)不同的日子過成了同一天的樣子；或許是追溯過去，對(duì)自己那些近乎偏執(zhí)的怪異信念的醒悟，這些天以來，思緒一直很凌亂，在腦海中不斷糾纏。 同時(shí)，在論文寫作過程中，我還參考了有關(guān)的書籍和論文，在這里一并向有關(guān)的作者表示謝意。因此急需一種能自動(dòng)檢測(cè)水位，并根據(jù)水位變化的情況自動(dòng)調(diào)節(jié)的自動(dòng)控制系統(tǒng)，我所研究的就是這方面的課題 。若水槽水位高于水位上限時(shí)，補(bǔ)水閥（ Y）關(guān)閉，停止抽水。 ⑦可在基本系統(tǒng)上擴(kuò)展，系統(tǒng)容易配置，與負(fù)載最遠(yuǎn)距離可達(dá) 10000 英尺，內(nèi)存可以擴(kuò)展。不同廠陜西航空職業(yè)技術(shù)學(xué)院畢業(yè)設(shè)計(jì)（論文） 10 家的 PLC，其編程元件的多少及編號(hào)方法不盡相同，但是基本的元件及功能很相近。 (2)與外設(shè)通信 自診斷正常后 PLC 即掃描編程器、上位機(jī)等通信接口，如有通信請(qǐng)求便響應(yīng)處理?？刂齐娐吩O(shè)計(jì)成小型，密封的結(jié)構(gòu)，可安裝在遠(yuǎn)程的控制地點(diǎn)。 KM2： 所謂電磁接觸器，就是應(yīng)用電磁鐵對(duì)負(fù)載電流進(jìn)行開閉控制的接觸器，主要用于電源電路的開閉。 二 水塔 供水 自 動(dòng)控制系統(tǒng)方案設(shè)計(jì) 設(shè)計(jì)方案 PLC 和傳感器構(gòu)成的水塔水位恒定的控制系統(tǒng) 原理 。 水塔水位控制系統(tǒng)采用交流電壓檢測(cè)水位 ,在控制系統(tǒng)啟動(dòng)后，若水槽水位低于水槽最低水位 S2 時(shí)液位傳感器將水位信號(hào)轉(zhuǎn)化為電信號(hào)向 PLC 發(fā)出信號(hào)， PLC 根據(jù)此信號(hào)打開補(bǔ)水泵向水槽補(bǔ)水，當(dāng)水位達(dá)到水槽最高水位 S4 時(shí)液位傳感器將水位信號(hào)轉(zhuǎn)化為電信號(hào)向 PLC 發(fā)出信號(hào)停止補(bǔ)水泵的工作，當(dāng)水塔水 位達(dá)到最低水位 S2 時(shí)，液位傳感器將水位信號(hào)轉(zhuǎn)化為電信號(hào)向 PLC 輸出，PLC 在收到信號(hào)后啟動(dòng)水泵向水塔加水，當(dāng)水塔水位達(dá)到最高水位 S1 時(shí)傳感器將水位信號(hào)轉(zhuǎn)化為電信號(hào)向 PLC 發(fā)出信號(hào)停止水泵的工作。當(dāng)常閉觸點(diǎn) KM2B 閉合時(shí)，綠燈 GNL 中有電流流過，綠燈點(diǎn)亮，當(dāng)常開觸點(diǎn) KM2m2 打開時(shí)，紅燈 RDL 中無 電流流過，紅燈熄滅。這個(gè)信號(hào)輸送到繼電器，從而產(chǎn)生輸出信號(hào)。 2 PLC 工作原理 PLC 的工作 方式 :采用循環(huán)掃描方式 .在 PLC 處于運(yùn)行狀態(tài)時(shí) ,從內(nèi)部處理 ,通信操作 ,程序輸入 ,程序執(zhí)行 ,程序輸出 ,一直循環(huán)掃描工作 . PLC 的工作過程 ： PLC 的工作過程基本上是用戶的梯形圖程序的執(zhí)行過程，是在系統(tǒng)軟件的控制下順次掃描各輸入點(diǎn)的狀態(tài)，按用戶程序解算控制邏輯， .然后順序向各個(gè)輸出點(diǎn)發(fā)出相應(yīng)的控制信號(hào)。如此不斷的反復(fù)循環(huán)掃描，實(shí)現(xiàn)對(duì)全過程及設(shè)備的連續(xù)控制，直至接收到停止命令、停電、或出現(xiàn)故障。 ④編程或修改程序容易，程序可以保存和固化。 當(dāng)電源斷電時(shí)，定時(shí)器被復(fù)位，而計(jì)數(shù)器不能被復(fù)位，其計(jì)數(shù)的當(dāng)前值保持不變。然后主控室再開動(dòng)電機(jī)進(jìn)行給排水。在此向杜 老師表示深深的感謝和崇高的敬意。s actions. CSKA said they were surprised and disappointed by Toure39。也曾經(jīng)好像已經(jīng)下定了決心去做某件事，但更多的時(shí)候是最后又打起了退堂鼓。ll be traveling fast, so despite the distance, it will not be like diving into the deep end of a pool. It will be like he is diving into the shallow end. Skydiver preps for the big jump When he jumps, he is expected to reach the speed of sound 690 mph (1,110 kph) in less than 40 seconds. Like hitting the top of the water, he will begin to slow as he approaches the more dense air closer to Earth. But this will not be enough to stop him pletely. 陜西航空職業(yè)技術(shù)學(xué)院畢業(yè)設(shè)計(jì)（論文） 23 If he goes too fast or spins out of control, he has a stabilization parachute that can be deployed to slow him down. His team hopes it39。t want to give vent to out your inner voice can be in the high school children of the feelings in a period, but was eventually infarction when graduation party in the throat, later again stood on the pitch he has sweat profusely, looked at his thrown a basketball hoops, suddenly found himself has already can39。s antiracism taskforce, is in London for the Football Association39。供水控制系統(tǒng)提高了小區(qū)的供水質(zhì)量。 2 結(jié)束語(yǔ) 現(xiàn)代傳感技術(shù)、電子技術(shù)、計(jì)算機(jī)技術(shù)、自動(dòng)控制技術(shù)、信息處理技術(shù)和新工藝、新材料的發(fā)展為智能檢測(cè)系統(tǒng)的發(fā)展帶來了前所未有的奇跡。 (1)輸 入 /輸出繼電器通道（ I/O）的分配 P 型機(jī)的輸入 /輸出繼電器通道（ CH）分配是固定的， 00~04CH 是輸入繼電器通道， 05~09CH 是輸出繼電器通道，不同型號(hào)的 PLC 機(jī)的基本單位和擴(kuò)展單位所能使用的通道號(hào)是不同的。 ③梯形圖中，一般情況下某個(gè)編號(hào)的繼電器線圈只能出現(xiàn)一次，而繼電器的觸點(diǎn)是可以被無限制的引用，既