【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 基于 s7200 plc 的十字路口交通信號燈控制系統(tǒng)設(shè)計 27 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。感謝學(xué)校老師給我們提供實踐的機會和條件，能夠鍛煉自己的實際動手能力，不僅停留在理論層面的學(xué)習(xí)，更要將所學(xué)轉(zhuǎn)化為一種能力和素質(zhì)，培養(yǎng)自己的工程實踐經(jīng)驗，從最基礎(chǔ)的課程設(shè)計做起，為實際動手操作，打?qū)嵒A(chǔ)，因為只有實踐，才能出真知。在學(xué)習(xí)的過程中，不是每一個問題都能自己解決，向老 師請教或向同學(xué)討論是一個很好的方法，不是有句話叫做學(xué)而不思則怠 ,做事要學(xué)思結(jié)合。 實踐不同于 理論，理論上可行的設(shè)計，在考慮實際條件的種種影響下，必須有所取舍，有側(cè)重，才能事半功倍，紙上得來終覺淺，絕知此事要躬行。 通過此次課設(shè)，讓我了解了 PLC 梯形圖、指令表、順序功能圖有了更好的了解，也讓我了解了關(guān)于 PLC 設(shè)計原理。能過比較選出最好的方案。上大學(xué)后，很 多同學(xué)都沒有過深入的交流，在設(shè)計的過程中，我們用了分工與合作的方式，每個人互責(zé)一定的部分，同時在一定的階段共同討論，以解決分工中個人不能解決的問題，在交流中大家積極發(fā)言，和提出意見，同時我們還向別的同學(xué)請教。 通過合作，我們的合作意識得到加強。在對理論的運用中，提高了我們的工程素質(zhì)，在沒有做實踐設(shè)計以前，我們對知道的撐握都是思想上的，對一些細節(jié)不加重視，當(dāng)我們把自己想出來的程序與到 PLC 中的時候，問題出現(xiàn)了，不是不能運行，就是運行的結(jié)果和要求的結(jié)果不相符合。 通過一周 的 PLC 設(shè)計實踐。 基于 s7200 plc 的十字路口交通信號燈控制系統(tǒng)設(shè)計 22 圖 圖 基于 s7200 plc 的十字路口交通信號燈控制系統(tǒng)設(shè)計 23 7 元件清單 名稱 型號 數(shù)量 備注 計算機 1 可編程控制器 S7200 1 西門子 數(shù)據(jù)線 1 STEP7Micro/WIN 1 基于 s7200 plc 的十字