【導(dǎo)讀】本論文敘述了用西門子S7-200型PLC實(shí)現(xiàn)對(duì)消防水泵知道控制的方法。傳統(tǒng)繼電器控制系統(tǒng)無法實(shí)現(xiàn)的定期主備互投和自動(dòng)測試功能。前系統(tǒng)故障率高、可靠性差、能源浪費(fèi)嚴(yán)重等一系列問題。動(dòng)兩種控制方式，便于對(duì)系統(tǒng)進(jìn)行維護(hù)修理，提高效率，實(shí)現(xiàn)自動(dòng)化消防給水。PLC，PLC對(duì)泵運(yùn)行的各工藝參數(shù)進(jìn)行采集、處理，實(shí)現(xiàn)泵與泵、閘閥等設(shè)備之間閉鎖，通訊的接口，可與礦局域網(wǎng)相連使上級(jí)管理系統(tǒng)實(shí)現(xiàn)對(duì)日用消防水泵房的監(jiān)控。試、現(xiàn)場檢修或集控系統(tǒng)出現(xiàn)故障時(shí)，可由就地按鈕箱上按鈕操作。

　　

【正文】 特別要感謝我的導(dǎo)師閆智武老 師。從論文的選題、文獻(xiàn)的采集、框架的設(shè)計(jì)、結(jié)構(gòu)的布局到最終的論文定稿，從內(nèi)容到格式，從標(biāo)題到標(biāo)點(diǎn)，他都費(fèi)盡心血。沒有閆智武老師的辛勤栽培、孜孜教誨，就沒有我論文的順利完成。 感謝自動(dòng)化系電測專業(yè)的各位同學(xué)，與他們的交流使我受益頗多。最后要感謝我的家人以及我的朋友們對(duì)我的理解、支持、鼓勵(lì)和幫助，正是因?yàn)橛辛怂麄儯宜龅囊磺胁鸥幸饬x；也正是因?yàn)橛辛怂麄?，我才有了追求進(jìn)步的勇氣和信心。 基于 PLC 的消防給水泵控制系統(tǒng)設(shè)計(jì) 25 參考文獻(xiàn) [1] 吳麗云 . 次高層建筑二次增壓供水方案探析 [J]. 超級(jí)考生網(wǎng) . [2] 魏福森 .高層建筑生活給水系統(tǒng)給水方式的選擇 [J]. 中國論文下載中心 . [3] 王再英等 . 樓宇自動(dòng)化系統(tǒng)原理與應(yīng)用 [M]. 北京：電子工業(yè)出版社 . 2020. [4] 高鴻斌，孔美靜，赫孟合 . 西門子 PLC 與工業(yè)控制網(wǎng)絡(luò)應(yīng)用 [M].北京：電子工業(yè)出版社， 2020. [5] 張興國 . 可編程序控制器技術(shù)及應(yīng)用 [M].北京：中國電力出版社， 2020， 25. [6]秦曾煌 電工學(xué) [M].北京：高等教育出版社， 2020， 319310. [7]Li Fenglian,Ren Qinglian Application of PLC in the Elevator Control System of Intelligence Building[J]. [8]Duan chengxian ， Huang Application of PLC in Modern Community[J]. 附錄 系統(tǒng)梯形圖 基于 PLC 的消防給水泵控制系統(tǒng)設(shè)計(jì) 26 基于 PLC 的消防給水泵控制系統(tǒng)設(shè)計(jì) 27 基于 PLC 的消防給水泵控制系統(tǒng)設(shè)計(jì) 28 基于 PLC 的消防給水泵控制系統(tǒng)設(shè)計(jì) 29 基于 PLC 的消防給水泵控制系統(tǒng)設(shè)計(jì) 30 基于 PLC 的消防給水泵控制系統(tǒng)設(shè)計(jì) 31 基于 PLC 的消防給水泵控制系統(tǒng)設(shè)計(jì) 32 Visafree policy brings Chengdu biz, tourism boost. Making national headlines several times, Chengdu39。s 72hour visafree policy has attracted wide attention from both Chinese and foreign experts and businessmen since it took effect on Sept 1 last year. The program permits citizens from 51 countries and regions including the United St ates, Australia, Canada and Japan who have valid visas and flight tickets to a third country to spend three days in the city. The capital of Sichuan province is the first city in the western region of China to offer foreign tourists a threeday visa and the fourth nationwide to adopt the policy following Shanghai, Beijing and Guangzhou. Li Zhiyong, deputy dean of the tourism institute at Sichuan University, said the move contributes to a large increase in the number of overseas tourists and raises the city39。s level of internationalization. The policy will also bring direct economic revenue, Li said. Chengdu has many cultural legacies and is also a paradise for panda lovers with the world39。s largest breeding and research center. Three days are long enough for foreign visitors to visit those iconic tourist spots, he noted. The city is home to the remains of the Jin sha civilization that dates back more than 3,000 years as well as the Qing cheng Mountains and the Du jiang yan irrigation system . Qing cheng has long been recognized as the birthplace of Taoism, China39。s ancient indigenous religion, while Du jiang yan is considered to be the oldest functioning watercontrol project in the world. Chengdu ranked third in tourist facilities, management and services among 60 Chinese cities in a customer satisfaction survey released last year. But, Li added that efforts are still needed to develop more tourism products, improve English services and provide accurate translation of traffic signs and scenic billboards. Zhao Yun, chairwoman of British Chamber of Commerce Southwest China, told China Daily that his colleagues found the policy very convenient. A British client once flew here and stayed for just one day to check her ordered goods, she said. Zhao was born in Shanxi province, but she has lived in Chengdu for more than 10 years. My life was like a running race moving from place to place. I also lived in Beijing and Shanghai before, she said. But Chengdu is a place that you never want to leave once settling down. It is now my second hometown, she said. If the environment is further improved, the city will attract more people to visit and live, with the 72hour visafree policy and pelling conditions in transportation, culture, climate and cuisine, he said. Foreigners also gave positive feedback on the policy. A spokesman from Dell Inc said the pany has a global hub of operation in Chengdu, so the threeday visa has an immediate and positive influence on the pany39。s business development. Rudy Buttignol, president of the public broadcasting pany in British Columbia, Canada, said his work requires frequent travel to Chengdu and the policy makes the trips easier. Data from the city39。s public security bureau shows some 100 foreign visitors enjoyed the 72hour policy by the end of March, most of them from the United States, the United Kingdom and Germany. Chengdu also reported robust growth in its overall tourist industry last year. Official statistics show that it received some 150 million tourists last year, an increase of 28 percent from 2020. Around million came from abroad, an increase of 12 percent. Total revenue from tourism surpassed 133 billion y uan ($). During his visit to Kazakhstan in September, Chinese President Xi Jinping prop osed that China and Central Asia join hands to build a Silk Road economic belt to boost cooperation. The idea has been widely echoed in Central Asian countries, being an encouraging blueprint for Chinese areas along the Silk Road that has linked Asia and Europe for more than 2,000 years. In the next three weeks, China Daily reporters will travel through the belt in China and in Kazakhstan, Uzbekistan and Turkey. They will show the progress and expectations of the countries, businesse s and peoples on the route. Shaanxi the start of the ancient Silk Road has positioned itself as the new starting point for the development of the Silk Road Economic Belt, which will strengthen China39。s cooperation with Central Asian countries, a senior official said. Shaanxi Governor Lou Qinjian said the province is fresh, rich and unique, as it was when it anchored one end of the ancient Silk Road. It is the best option for acmodating industrial transfers from East China or the world at large, he said on Wednesday in Xi39。an. Lou held a joint interview with 27 media, including China Daily, the first in a series of interviews entitled Chinese Media Along the Silk Road. The interviews will be in Shaanxi and Gansu provinces and the Xinjiang Uygur autonomou