【正文】 會(huì)介紹。程序包含啟動(dòng)程序、停止程序、加速程序、減速程序、爬行程序與通訊程序。 PLC 的軟件編程 符號表： 為了編程方便，這里編輯了符號表，對于八臺(tái)需要控制的傳動(dòng)電機(jī)與八臺(tái)風(fēng)扇電機(jī) ,對于傳動(dòng)電機(jī)包括五個(gè)需要控制的操作，即加速、減速、啟動(dòng)、停止、爬行。 初始化 邏輯控制 加減子程序 速度連比計(jì)算 Y 加減速？ 速度控制 通訊 圖 軟件編程流程圖 23 圖 符號表 電機(jī)的啟動(dòng)程序 ，這里采用通訊控制，將控制啟動(dòng)指令 47F 發(fā)送到數(shù)據(jù)模塊 DB1中，由通訊程序負(fù)責(zé)將數(shù)據(jù)塊中的指令數(shù)據(jù)發(fā)送到變頻器的通訊適配器中，由變頻器執(zhí)行相關(guān)指令。啟動(dòng)程序如圖 所示。 24 圖 電機(jī)的停止程序 數(shù)據(jù)模塊是 PLC 與變頻器之間的通訊媒介， 存放著 PLC 與變頻器之間的交換數(shù)據(jù)， FC 模塊功能的實(shí)現(xiàn)則是通過調(diào)用 DB 模塊中的數(shù)據(jù)，或者將數(shù)據(jù)賦到數(shù)據(jù)塊中，再 有 數(shù) 據(jù) 塊 將 其 轉(zhuǎn) 送 給 變 頻 器 。 圖 數(shù)據(jù)模塊 DB 25 結(jié) 論 本文依據(jù)造紙機(jī)的工藝要求，結(jié)合自動(dòng)化所學(xué)知識(shí)，設(shè)計(jì)了一套基于 PLC 的造紙機(jī)控制系統(tǒng)。 同時(shí)考慮對工作電極的散熱，系統(tǒng)加進(jìn)了一個(gè)風(fēng)扇電機(jī)。 設(shè)計(jì)雖然完成了，但我只是掌 握了傳動(dòng)系統(tǒng)中很少的一部分知識(shí)，還有很多深?yuàn)W的專業(yè)知識(shí)等著我們?nèi)ネ诰?、去探索、去學(xué)習(xí)。由于所學(xué)知識(shí)和時(shí)間有限，加上缺乏實(shí)踐經(jīng)驗(yàn)，在設(shè)計(jì)過程中難免出現(xiàn)錯(cuò)誤，敬請各位老師批評指正。 畢 業(yè)設(shè)計(jì)的工作并不輕松， 壓力時(shí)時(shí)襲攏，知識(shí) 的匱乏，致使我埋頭啃書，向同學(xué)請教 ， 向老師尋求意見， 才完成這套設(shè)計(jì)， 這其中的酸甜苦辣 值得我 用 一生慢慢 品嘗的。 首先我要 感謝我的指導(dǎo)老師 葛鎖良老師 ，我能夠順利完成畢業(yè)設(shè)計(jì)離不開他的細(xì)心指導(dǎo)，從論文的選題、修改直到完成，老師給予了我悉心的指導(dǎo)與幫助 。在此，向老師致以最誠摯的謝意 。 這次設(shè) 計(jì)工作使我受益匪淺， 讓我對 以前所學(xué)關(guān)于 變頻器、 PLC 等方面的知識(shí) 有了一個(gè)全新的的了解 ， 并懂得如何將所學(xué)知識(shí)與實(shí)際結(jié)合在一起， 也進(jìn)一步激發(fā)了我深入學(xué)習(xí)的興趣。2022年 ,第 07 期 :3～ 5 [5]陳靜，張麗娜 .基于 PLC和 PROFIBUS現(xiàn)場總線的變頻器群控技術(shù)應(yīng)用 [J]科技信息，2022年，第 22期 :1～ 3 [6]王建平 ,朱成輝 .電氣控制與 PLC[M].北京 :機(jī)械工業(yè)出版社 .2022 [7] 龍凱 .基于 PROFIBUS 的 PLC控制系統(tǒng)的設(shè)計(jì)研究 [D].武漢科技大學(xué) .2022 [8]陳伯時(shí) .電力拖動(dòng)自動(dòng)控制系統(tǒng) 運(yùn)動(dòng)控制系統(tǒng) [M]。rez Claudia。 ll wait in the line for one hour to get a ticket, and another two hours at the site, to only see a tiny bit of the place due to the crowds. Last year, 428 million tourists traveled in China over the weeklong holiday in October. Traveling during this period is a matter that needs thorough preparation. If you are short on time to plan the uping Golden Week it may not be a bad idea to avoid some of the most crowded places for now. There is always a place so fascinating that everyone yearns for. Arxan is a place like this. The beauty of Arxan is everlasting regardless of the changing of four seasons. Bestowed by nature, its spectacular seasonal landscape and mountains are just beyond word. Arxan is a crucial destination for the remended travelling route, China Inner Mongolia Arxan — Hailar — Manzhouli. It is also the joint of the four prairies across the SinoMongolian border, where people gravitate towards the exotic atmosphere mixed with Chinese, Russian, and Mongolia elements. As a historic site for the Yitian Battle, Arxan still embodies the spirit of Genghis Khan. Walking into Arxan, you will be amazed by a kaleidoscope of geous colors all the year round the Spring azaleas blooming red in the snow, the Summer sea wavering blue in the breeze, the Autumn leaves painted in yellow covering volcanic traces, and the Winter woods shining white on the vast alpine snowscape. Hinggan League Arxan city is situated in the far eastern area of Inner Mongolia Autonomous Region. Its full name Haren Arxan means hot holy water in the Mongolian language. Arxan is a tourism city in the northern frontier with a blend of large forest, grand prairies, vast snowfield, heaven lake cluster, thermium, as well as volcanic cluster. It is a rare and unique ecotourism base filled with healthy sunshine, clean air and unspoiled green. Nestled close to the country39。s time for the wild fruits to ripe. The picturesque Arxan in Autumn is indeed a fairyland only exists in a dream that satisfies all your fantasies. If it rains heavily on Saturday night, some elderly Chinese will say it is because Zhinu, or the Weaving Maid, is crying on the day she met her husband Niulang, or the Cowherd, on the Milky Way. Most Chinese remember being told this romantic tragedy when they were children on Qixi, or the Seventh Night Festival, which falls on the seventh day of the seventh lunar month, which is usually in early August. This year it falls on Saturday, August 2. Folklore Story As the story goes, once there was a cowherd, Niulang, who lived with his elder brother and sisterinlaw. But she disliked and abused him, and the boy was forced to leave home with only an old cow for pany. The cow, however, was a former god who had violated imperial rules and was sent to earth in bovine form. One day the cow led Niulang to a lake where fairies took a bath on earth. Among them was Zhinu, the most beautiful fairy and a skilled seamstress. The two fell in love at first sight and were soon married. They had a son and daughter and their happy life was held up as an example for hundreds of years in China. Yet in the eyes of the Jade Emperor, the Supreme Deity in Taoism, marriage between a mortal and fairy was strictly forbidden. He ordered the heaven troop to catch Zhinu back. Niulang grew desperate when he discovered Zhinu had been taken back to heaven. Driven by Niulang39。 Festival. In this day, girls will throw a sewing needle into a bowl full of water on the night of Qixi as a test of embroidery skills. If the needle floats on top of the water instead of sinking, it proves the girl is a skilled embroiders. Single women also pray for finding a good husband in the future. And the newly married women pray to bee pregnant quickly. Tradition transformed The love story of Niulang and Zhinu, and the Qixi Festival have been handed down for generations. Yet these ancient traditions and customs are slowly dying out. Many modern Chinese, particularly youngsters, seem to know more about St Valentine39。s Day. More and more young Chinese people begin to celebrate this day in a very similar way as that in western countries. Fewer people than ever will gaze at the heavens on Saturday to pick out the two stars shining bright on either side of the Milky Way, that is, if people even know on which day Qixi falls. There are ready reminders dotted about, in the form of big ads saying Sales on Chinese Valentine39