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OFweek工控网讯什么样的PLC能够适应工业4.0的“柔性制造”要求，或许才可称之为高端PLC。

高端PLC應具備編程十分簡單，盡可能隱藏那些與生産工藝無關的細節，如：數據、數據庫、變量、通訊等。

2016年未，工控論壇上發起了高端PLC的討論。要說高端，可能沒有一個能夠生産PLC的商家不認爲自己的PLC高端，即使不高端也認爲自己PLC有特色！因此，這是一個見仁見智的話題。目前，工業4．0在中國也如火如荼的討論著，那麽，什麽樣的PLC能夠適應工業4．0的“柔性制造”要求？這樣的PLC或許才可稱之爲高端PLC。

自從工業4．0柔性制造的提出，我就充滿了好奇，我知道目前的PLM、MES性能已達到相當境界，但最終怎樣讓PLC執行生産任務呢？在PLC中事先枚舉？根據生産工藝變化重新給PLC編程？顯然，兩種方式都有嚴重問題！枚舉，編程複雜易遺漏，工藝適應性差；重新給PLC編程就不討論了，這正是全世界目前正在使用的方式，無法解決MES與PLC的那堵牆！柔性制造就需要柔性PLC，誰能解決這一問題，可能才能順應工業4．0的潮流，基本稱得上高端PLC。

FCS系統已經提出很長時間了，它是智能執行單元通過總線自主獲取信息實現自主控制的系統。其優越性絕非CCS系統和DCS系統能夠比擬。商家大多將還未實現FCS怪罪于紛繁多樣的現場總線控制協議，“語言”不統一，怎麽能實現？于是爭相將現場總線統一到對自身設備有利的總線。時間證明，這幾乎是遙遠漫長的過程。多樣的總線協議是曆史問題，作爲高端PLC不正應該解決這一問題？況乎，總線問題解決了，FCS就實現了嗎？如何對衆多的不同廠家的智能設備單元編程？千萬不要說要求智能設備單元廠家按不同的工藝編程生産！這說明什麽？這說明我們的PLC需要一個創新的模式來解決這一些問題。這是看得見的高端。

相信讨论这一话题的人，都是工控人，然而称得上高端PLC，必然智能性很强，如果真有一款PLC能够冲破与MES那堵墙，PLC的编程也变得十分简单，几乎就是对工艺的描述，你是否还有心情讨论这一话题？别说这不可能，算盘时代，有人说发明了计算器，算盘也说不可能！因此，高端PLC應具備編程十分簡單，盡可能隱藏那些與生産工藝無關的細節，如：數據、數據庫、變量、通訊等。

當然，高端PLC不僅僅具備以上特性，比如：高可靠性、冗余簡單、運動控制高速同步等等。工業4．0，就應該有與之相適應的PLC，這樣的PLC離我們還有多遠？這樣的PLC你真的想用？那就讓我們拭目以待吧！

For an Oriental city Tokio has remarkably wide streets, and some of them are laid out with all the care of Western engineering. In the course of their morning ride the party came to Sakuradu Avenue, which Fred recognized from a drawing by a native artist, who had taken pains to preserve the architecture of the buildings on each side with complete fidelity. The foundations of the houses were of irregular stones cut in the form of lozenges, but not with mathematical accuracy. The boys had already noticed this form of hewing stone in the walls of the castles, where some very large blocks were piled. They were reported to have been brought from distant parts of the empire, and the cost of their transportation must have been very great. Few of the houses were of more than two stories, and the great majority were of only one. Along Sakuradu Avenue they were of two stories, and had long and low windows with paper screens, so that it was impossible for a person in the street to see what was going on inside. The eaves projected far over the upright sides, and thus formed a shelter that was very acceptable in the heat of summer, while in rainy weather it had many advantages. These yashikis were formerly the property of Daimios, but are now occupied by the Foreign Office and the War Department. Inside the enclosure there are many shade-trees, and they make a cooling contrast to the plain walls of the buildings. The Japanese rarely paint the interior or the exterior of their buildings. Nearly everything is finished in the natural color of the wood, and very pretty the wood is too. It is something like oak in appearance, but a trifle darker, and is[Pg 120] susceptible of a high polish. It admits of a great variety of uses, and is very easily wrought. It is known as keyaki-wood; and, in spite of the immense quantity that is annually used, it is cheap and abundant. "Shut it," said Charlotte, with a sigh like that which had risen when the lead first struck her. "If I could be moved ever so little,--" she said. "That's his look-out, madam. If the sick lady isn't Charlotte Oli'--" The truth is that Doctor Allingham had not been able to summon the courage to make a further examination of the Clockwork man; and he had permitted himself to assume that there would be no immediate developments. So far as was possible he had allowed himself that very necessary relaxation, and he had insisted upon Gregg sharing it with him. The Clockwork man was not quite what either of them had, alternatively, hoped or feared. From Allingham's point of view, in particular, he was not that bogey of the inhuman fear which his original conduct had suggested. True, he was still an unthinkable monstrosity, an awful revelation; but since the discovery of the printed instructions it had been possible to regard him with a little more equanimity. The Clockwork man was a figment of the future, but he was not the whole future. Skip this postscript if you don't want your sensibilities all Larry took a swift, sharp look around the enclosure. His railroad friend again came up with some hot coffee and broiled meat, and explained that after the train had reached a station some miles out it got orders to run back and clear the track for some trains of troops from the Army of the Potomac which were being rushed through. The Deacon's heart almost sank in despair, but he took the coffee and meat, and helped the boys to it. As they were all eating they heard a voice outside which struck on the chords of their memories: "Whose head'll you knock off?" said a burly man, thrusting himself in front of the lawyer, with his fist doubled. "Why," said Si, "I supposed that they was too tired to do anything but lay down and go to sleep. What'd they do?" "It isn't me. I only asked for a little time to think it over, and then you go and cool off." These tricks were never unkind, for David and William were the most benevolent little boys. They saw life through a golden mist, it smelt of milk and apples, it was full of soft lowings and bleatings and cheepings, of gentle noses to stroke and little downy things to hold. For the first time since it became Reuben's, Odiam made children happy. The farm which had been a galley and a prison to those before them, was an enchanted land of adventure to these two. Old Beatup, who remembered earlier things, would sometimes smile when he saw them trotting hand in hand about the yard, playing long hours in the orchard, and now and then[Pg 385] pleading as a special favour to be allowed to feed the chickens, or help fetch the cows home. He seemed to see the farm peopled by little ghosts who had never dared trot about aimlessly, or had time to play, and had fed the fowls and fetched the cows not as a treat and an adventure, but as a dreary part of the day's grind ... he reflected that "the m?aster had learned summat by the others, surelye." "My lord," said the intrepid yeoman, "I had a right to defend my dwelling against unlawful assault." Here Calverley's quick ear caught the sound of the tramping of a horse—his heart beat quick—it might be a traveller journeying to Gloucester, but it was more probable that it was the messenger. He threw the bridle of his horse over the branch of a tree, sprang to the end of the path, and, concealing himself behind the under-wood, discovered in a moment, by the dark medley hue of the rider's dress, that it was the man he expected. He hurried back, and, mounting his steed, waited till the echo of the horse's hoofs could no longer be distinguished; and then, giving the impulse to his own spirited animal, he was the next moment bounding at full speed after the messenger, followed at a distance by his accomplice. No reply was given, but the door was instantly unclosed by Holgrave. Black Jack stood in the shade, just beyond the light that streamed from within, but so close that Holgrave, without crossing the threshold, merely leant his head forward, and heard him say, "Stephen Holgrave, do you remember the cross-roads and Hailes church-yard?" HoME 欧美videosgratis浓毛ENTER NUMBET 002zengpang.com.cn
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