【正文】 設(shè)定值為220V、350V。當(dāng)現(xiàn)場(chǎng)轉(zhuǎn)速小于設(shè)定轉(zhuǎn)速時(shí)，頻率f進(jìn)行自加1；當(dāng)現(xiàn)場(chǎng)轉(zhuǎn)速等于設(shè)定轉(zhuǎn)速時(shí)，程序跳出，進(jìn)行安全檢測(cè)環(huán)節(jié)；當(dāng)現(xiàn)場(chǎng)轉(zhuǎn)速大于設(shè)定轉(zhuǎn)速，頻率f進(jìn)行自減1。LD M8002ZCP D6 D8 D16 AND M12CJ P90AND M13CJ P60AND M14CJ P90當(dāng)電壓或者電流超出安全范圍時(shí)，閃爍電路開(kāi)始工作，閃爍后自動(dòng)停止。（2）自動(dòng)控制，通過(guò)軟件控制，程序如下LD X002OUT M0在正常停止情況時(shí)候，需要延遲一段時(shí)間，以便能把貨物順利卸載。(1)設(shè)備選擇 在選擇設(shè)備時(shí)，首先選擇較高抗干擾能力的產(chǎn)品，它包括電磁兼容性，尤其是抗外部干擾能力，如采用浮地技術(shù)、隔離性能好的PLC系統(tǒng)；其次應(yīng)了解生產(chǎn)廠家給出的抗干擾指標(biāo)，如共模抑制比、差模抑制比、耐壓能力、允許在多大電場(chǎng)強(qiáng)度和多高頻率的磁場(chǎng)強(qiáng)度環(huán)境中工作等。皮帶運(yùn)輸系統(tǒng)中，PLC作為現(xiàn)場(chǎng)控制設(shè)備，能夠可靠、準(zhǔn)確地完成控制操作，且可以通過(guò)與上級(jí)工控機(jī)通信，是現(xiàn)代工業(yè)控制中比較先進(jìn)的控制方案，應(yīng)用前景十分廣泛。在對(duì)皮帶運(yùn)輸機(jī)的PLC控制系統(tǒng)設(shè)計(jì)時(shí)，系統(tǒng)組成合理，但可能考慮不夠周全，有些控制電路如皮帶跑偏沒(méi)能考慮進(jìn)去。在設(shè)計(jì)過(guò)程中許多同學(xué)給我提供了很多的幫助，在此表示我的謝意。河南理工大學(xué)給我提供了再次學(xué)習(xí)的機(jī)會(huì)，在這里有良好的學(xué)習(xí)環(huán)境，一流的實(shí)驗(yàn)設(shè)備，高水平的老師教會(huì)了我一身的本領(lǐng)，在這里我掌握了各門知識(shí)，掌握了各種技能。80s. We sat on the back of pickup trucks for hours. The sky was blue, and we couldn39。s performers of the troupe still tour the region39。s Liaoning province, decades ago. The solider gave the old man a handmade saddle when they bid farewell. The story inspired Nasun to write Carved Saddle, a song that later became one of his most popular numbers. Now, every year, Nasun recruits young singers and dancers for the troupe. The troupe has also designed a new repertoire, which is mostly based on the daily lives of Mongolian people, especially the lives of nomadic families, and has bined contemporary musical elements with folk songs of the region. Haimu, a 25yearold khoomei (a local variant of overtone singing) singer, joined the troupe three years ago. Along with a sixmember band, he performs fast songs and soft ones that he writes－all while playing the horsehead fiddle.Although I learned the piano since childhood and grew up listening to various kinds of music, to me, the folk music of Inner Mongolia is the root, he says. Performing in remote villages is pleasant. I feel at home on the boundless grasslands, and the warm people there make me feel fulfilled. The first round of spring auction season in Beijing ended last week, but it failed to create much spring in the art market. Although two pieces of Chinese painting fetched more than 100 million yuan, the decline in trading volume and sale rate showed a downturn this year. In the “Grand View: Chinese Painting Highlight” session at China Guardian 2015 spring auctions, Pan Tianshou’s representative work Eagle, Rock and Flora hit a record auction price of 279 million yuan, while Li Keran’s masterwork Jinggang Mountain fetched million yuan, an unexpected high in recent years. However, the trading volume fells to billion yuan from billion yuan in the same period the year before. The Huangchen 2015 Spring Auctions, which recorded million yuan in total sales, experienced the same. The section number went down to 5 from 12 pared to last year. According to expert Shao Jianwu, the art market did not attract much excitement this year due to the booming stock market and the persistent problems of forgery and fake deals. The two pieces of Chinese painting notched up high price this spring due to their own value not due to a revival in the market. The successful transaction of two works with a hammer price of more than 100 million yuan once again confirms that valuable and rare works of high quality always earn the longlasting high price. Chinese painting and calligraphy is still the pillar of the market. However, the overall sales rate has dropped slightly, which reflects the demand for the ordinary auction goods has weakened,” said the president of China Guardian’s Hu Yanyan. Besides, the entry of new buyers also makes certain changes to the direction of purchasing. In a word, the overall market trend is very unpredictable. Although China Guardian 2015 Spring Auctions has achieved remarkable results, it does not mean that the market has walked out of the predicament. We still have to wait for the big economic boom to invigorate the art market.” Even so, the hot pursuit of some special items appeared this spring. A special session of China Guardian Spring Auctions titled “Fine Gilt—Bronze Buddhist Images” achieved a great deal with total sales volume of million yuan and 92 percent sale rate. The 5th Shamar Rinpoche Statue from 1617th century of Tibet was sold for million yuan. The Beijing Chengxuan Auctions featured almost 2,800 items of coins and stamps in three sessions with good sale rate. The Huachen Auctions also set a special session of photographs under the condition of largescale decline of auction sessions. There was a palpable dull thud of disappointment that acpanied the return of the imperial entourage of Zhen Huan to her homeland. It followed a couple years of hushed excitement as Chinese fans were fed tidbits about their proud concubine who was supposed to conquer the high ground of the North American market. Zhen Huan is, of course, the title character of The Legend of Zhen Huan, a 2011 television series that swept China off its feet and later took other Asian countries by storm. Two years ago, it was reported that HBO, a premium cable service headquartered in the United States, was going to air it in North America after some modification. Now, a condensed version that provides English subtitles but no dubbing has finally been made available on Netflix for online streaming. This version, highly anticipated as a milestone in China39。s essay titled SelfReliance. If you39。s essay affects me very deeply. Not as an urging to bee self reliant – I39。 work lives easier, but I simply could not digest the fact that that was my sole purpose in life. With no family to support, I was the sole beneficiary of my employment: the paycheck, the benefits, the incentives and the rewards were mine alone. Not much of a purpose in being selfserving, is there? While I was a student, I felt I was leading a purposeful life. Learning new things, broadening my horizons, expanding my life experiences all gave my life a zip and drive that I had not felt since being in survival mode when my kids were small. After graduating college I felt oddly deflated… but by then, China was on my horizon.