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可編程控制器{外文翻譯}.rar

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可編程控制器{外文翻譯},包含中文翻譯和英文原文,內(nèi)容詳細(xì)完整,建議下載參考!中文: 6800 字英文: 21500 字符可編程控制器可定義為一個(gè)可設(shè)計(jì)程序的有著記憶、執(zhí)行、實(shí)現(xiàn)邏輯的以微型計(jì)算機(jī)為基礎(chǔ)控制器的,包括執(zhí)行邏輯運(yùn)算,先后順序,計(jì)時(shí),計(jì)算和算術(shù)函數(shù)等功能的數(shù)字或模擬的輸入/輸出(i/ o)模塊,來完成控制機(jī)器...
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可編程控制器{外文翻譯}

包含中文翻譯和英文原文,內(nèi)容詳細(xì)完整,建議下載參考!

中文: 6800 字
英文: 21500 字符

可編程控制器可定義為一個(gè)可設(shè)計(jì)程序的有著記憶、執(zhí)行、實(shí)現(xiàn)邏輯的以微型計(jì)算機(jī)為基礎(chǔ)控制器的,包括執(zhí)行邏輯運(yùn)算,先后順序,計(jì)時(shí),計(jì)算和算術(shù)函數(shù)等功能的數(shù)字或模擬的輸入/輸出(I/ O)模塊,來完成控制機(jī)器和程序的目的的處理器。PLC應(yīng)用軟件被廣泛應(yīng)用在工業(yè)過程控制和離散的制造業(yè)中,但是它主要地與后者有關(guān)工業(yè)控制操作儀器的機(jī)器,變換生產(chǎn)線和原料控制。 二十世紀(jì)七十年代,在PLC為被推廣引用之前,工業(yè)上使用的有連接線路的控制器還主要是由繼電器,線圈,計(jì)數(shù)器,定時(shí)器組成,并通過模擬的成份來實(shí)現(xiàn)這種工業(yè)控制。
二十世紀(jì)六十年代中期,理查 Morley ,作為貝德福德同伴的合伙人 ,經(jīng)營著英國一家新興的以控制系統(tǒng)為主的公司。公司主要做用微型處理器來代替繼電器的工作。在1968年1月,Morley提出了一個(gè)偉大的設(shè)想,并且為第一個(gè)可編程控制器擬寫了具體的設(shè)計(jì)說明,他的出現(xiàn)足以彌補(bǔ)當(dāng)時(shí)傳統(tǒng)計(jì)算機(jī)在過程控制等方面的局限,也就是說,它將成為一個(gè)實(shí)時(shí)控制系統(tǒng)(第4.3.1節(jié)),并且是可預(yù)先設(shè)計(jì)的,可靠的,可對現(xiàn)有的控制系統(tǒng)進(jìn)行大范圍的調(diào)整,潛力巨大。這種設(shè)計(jì)將以梯形邏輯為基礎(chǔ),并將廣泛的用于工業(yè)控制中。這時(shí)出現(xiàn)的控制器被成為MODICON 084 模型。MODICON(莫迪康)是模組數(shù)傳(Modular Digital Controller)的縮寫。084的由來是因?yàn)樗堑?4種比德福同伴開發(fā)的產(chǎn)品 ......



ABOUT PROGRAMMABLE LOGIC CONTROLLERS
A programmable logic controller can be defined as a microcomputer-based controller that uses stored instructions in programmable memory to implement logic, sequencing, timing, counting, and arithmetic functions through digital or analog input/output (I/O) modules, for controlling machines and processes. PLC applications are found in both the process industries and discrete manufacturing, but it is primarily associated with the latter industries to control machines, transfer lines, and material handling equipment. Before the PLC was introduced around 1970, hard-wired controllers composed of relays, coils, counters, timers, and similar components were used to implement this type of industrial control.
In the mid-1960s, Richard Morley was a partner in Bedford Associates, a New England consulting firm specializing in control systems for machine tool companies. Most of the firm's work involved replacing relays with minicomputers in machine tool controls. In January 1968, Morley devised the notion and wrote the specifications for the first programmable controller) It would overcome some of the limitations of conventional computers used for process control at the time; namely, it would be a real-time processor (Section 4.3.1), it would be predictable and reliable, and it would be modular and rugged. Programming would be based on ladder logic, which was widely used in the industrial controls. The controller that emerged was named the Modicon Model 084. MODICON was an abbreviation of modular Digital controller. Model 084 was derived ......