【正文】 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。 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 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。 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。 老師教誨之恩，當(dāng)永記今生。行方智圓煅內(nèi)蘊(yùn)，海闊天空鑄宏圖。另外在此次設(shè)計(jì)中，同組的同學(xué)也給了我很大的幫助，家人對(duì)我的幫助。在此請(qǐng)接受的最真誠的感謝?；?PROFIBUSDP 計(jì)變頻器通訊控制系統(tǒng)設(shè) 19 參考文獻(xiàn) [1] 秦益霖等人編著 . 西門子 S7300PLC 應(yīng)用技術(shù) . 北京： 電子工業(yè)出版社 ， 2021. [2] 王占奎等編著 . 交流變頻調(diào)速應(yīng)用例集 [M]. 北京：科學(xué)出版社 ， 1995. [3] 李愛云，張 承慧編著 . 現(xiàn)代逆變技術(shù)及應(yīng)用 [M]. 北京：科學(xué)出版社 ， 2021. [4] 陳國呈編著 . PWM變頻調(diào)速及軟開關(guān)電力變換技術(shù) [M]. 北京：機(jī)械工業(yè)出版社 ， 2021. [5] 胡崇岳編著 . 現(xiàn)代交流調(diào)速技術(shù) [M].第二版 . 北京：機(jī)械工業(yè)出版社 ， 1998. 河南機(jī)電高等專科學(xué)校畢業(yè) 論文 致 謝 在田 效伍 老師的指導(dǎo)下，經(jīng)過幾個(gè)月的努力，我完成了畢業(yè)設(shè)計(jì)設(shè)計(jì)任務(wù)。 它 使我意識(shí)到 自己 的操作能力的不足，在理論上 還存在 很多缺陷。 經(jīng)過這次的課程設(shè)計(jì)， 讓我深深的感受到理論聯(lián)系實(shí)踐的重要性， 平時(shí)在學(xué)習(xí)中不能夠透徹理解的知識(shí)，通過動(dòng)手，會(huì)有更好的認(rèn)知。只有理論，沒有結(jié)合實(shí)際是很難做出東西的。不過經(jīng)過自己幾天的努力，最后還是做了出來，而且還做得挺不錯(cuò)的。另外就是在 遇到實(shí)際問題的時(shí)候 ， 要 認(rèn)真思考 ， 運(yùn)用所學(xué)的知識(shí)，一步一步的去探索，是完全可以解決遇到的一般問題 的。 除了學(xué)會(huì)了西門子 S7— 200 的基本知識(shí)，并掌握了 S7— 200 的工作原理和一些指令的功能以外，還掌握了傳感器和變頻器的使用方法，并且深化了我對(duì) PID 控制技術(shù)的理解。 通過這次的 課程設(shè)計(jì) ，讓我受益匪淺。所以，在此設(shè)計(jì)中我采用可編程序控制器和通用變頻器，以 PROFIBUS 做為通訊實(shí)現(xiàn)對(duì)交流電機(jī)的調(diào)速控制。 以往，采用的繼電器方式的邏輯控制，控制方式落后，系統(tǒng)復(fù)雜，發(fā)現(xiàn)和排除故障困難。 NETWORK 1： Title: Coment: CALL SFC14“DPRD_DAT” LADDR :=W16100 RET_VAL:=MWO RECORD :=PM BYTE 4 NETWORK 2： Title: 河南機(jī)電高等專科學(xué)校畢業(yè) 論文 Coment: CALL SFC15“DPWR_DAT” LADDR :=W16100 RECORD :=PM BYTE 4 RET_V