① 關於畢業設計:基於plc的自動門控制系統 的外文文獻翻譯
童鞋你好!
這個估計需要自己搜索了!
網上基本很難找到免費給你服務的!
我在這里給你點搜索國際上常用的外文資料庫:
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❶ISI
web
of
knowledge
Engineering
Village2
❷Elsevier
SDOL資料庫
IEEE/IEE(IEL)
❸EBSCOhost
RSC英國皇家化學學會
❹ACM美國計算機學會
ASCE美國土木工程師學會
❺Springer電子期刊
WorldSciNet電子期刊全文庫
❻Nature周刊
NetLibrary電子圖書
❼ProQuest學位論文全文資料庫
❽國道外文專題資料庫
CALIS西文期刊目次資料庫
❾推薦使用ISI
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Engineering
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中文翻譯得自己做了，實在不成就谷歌翻譯。
弄完之後，自己閱讀幾遍弄順了就成啦!
學校以及老師都不會看這個東西的!
外文翻譯不是論文的主要內容!
所以，很容易過去的!
祝你好運!
② 【求PLC外文文獻】有沒有一片關於PLC控制的外文文獻，帶翻譯更好，畢業設計用，不少於5000字。
外文文獻有，但中文翻譯沒有，翻譯得靠你自己了，如果需要的話回復即可，希望能幫到你，多多給點懸賞分吧，急用的話請多選賞點分吧，這樣更多的知友才會及時幫到你，我找到也是很花時間的
③ 求PLC相關英文文獻 以及 中文翻譯——畢業設計急用
你要的不知是不是這個...希望幫得了你...
Central Processing Unit (CPU) is the brain of a PLC controller. CPU itself is usually one of the microcontrollers. Aforetime these were 8-bit microcontrollers such as 8051, and now these are 16-and 32-bit microcontrollers. Unspoken rule is that you』 find mostly Hitachi and Fujicu microcontrollers in PLC controllers by Japanese makers, Siemens in European controllers, and Motorola microcontrollers in American ones. CPU also takes care of communication, interconnectedness among other parts of PLC controllers, program execution, memory operation, overseeing input and setting up of an output. PLC controllers have complex routines for memory checkup in order to ensure that PLC memory was not damaged (memory checkup is done for safety reasons).Generally speaking, CPU unit makes a great number of check-ups of the PLC controller itself so eventual errors would be discovered early. You can simply look at any PLC controller and see that there are several indicators in the form. of light diodes for error signalization.
System memory (today mostly implemented in FLASH technology) is used by a PLC for a process control system. Aside form. this operating system it also contains a user program translated forma ladder diagram to a binary form. FLASH memory contents can be changed only in case where user program is being changed. PLC controllers were used earlier instead of PLASH memory and have had EPROM memory instead of FLASH memory which had to be erased with UV lamp and programmed on programmers. With the use of FLASH technology this process was greatly shortened. Reprogramming a program memory is done through a serial cable in a program for application development.
User memory is divided into blocks having special functions. Some parts of a memory are used for storing input and output status. The real status of an input is stored either as 「1」or as 「0」in a specific memory bit/ each input or output has one corresponding bit in memory. Other parts of memory are used to store variable contents for variables used in used program. For example, time value, or counter value would be stored in this part of the memory.
PLC controller can be reprogrammed through a computer (usual way), but also through manual programmers (consoles). This practically means that each PLC controller can programmed through a computer if you have the software needed for programming. Today』s transmission computers are ideal for reprogramming a PLC controller in factory itself. This is of great importance to instry. Once the system is corrected, it is also important to read the right program into a PLC again. It is also good to check from time to time whether program in a PLC has not changed. This helps to avoid hazardous situations in factory rooms (some automakers have established communication networks which regularly check programs in PLC controllers to ensure execution only of good programs).
Almost every program for programming a PLC controller possesses various useful options such as: forced switching on and off of the system input/outputs (I/O lines), program follow up in real time as well as documenting a diagram. This documenting is necessary to understand and define failures and malfunctions. Programmer can add remarks, names of input or output devices, and comments that can be useful when finding errors, or with system maintenance. Adding comments and remarks enables any technician (and not just a person who developed the system) to understand a ladder diagram right away. Comments and remarks can even quote precisely part numbers if replacements would be needed. This would speed up a repair of any problems that come up e to bad parts. The old way was such that a person who developed a system had protection on the program, so nobody aside from this person could understand how it was done. Correctly documented ladder diagram allows any technician to understand thoroughly how system functions.
Electrical supply is used in bringing electrical energy to central processing unit. Most PLC controllers work either at 24 VDC or 220 VAC. On some PLC controllers you』ll find electrical supply as a separate mole. Those are usually bigger PLC controllers, while small and medium series already contain the supply mole. User has to determine how much current to take from I/O mole to ensure that electrical supply provides appropriate amount of current. Different types of moles use different amounts of electrical current.
This electrical supply is usually not used to start external input or output. User has to provide separate supplies in starting PLC controller inputs because then you can ensure so called 「pure」 supply for the PLC controller. With pure supply we mean supply where instrial environment can not affect it damagingly. Some of the smaller PLC controllers supply their inputs with voltage from a small supply source already incorporated into a PLC.
從結構上分，PLC分為固定式和組合式（模塊式）兩種。固定式PLC包括CPU板、I/O板、顯示面板、內存塊、電源等，這些元素組合成一個不可拆卸的整體。模塊式PLC包括CPU模塊、I/O模塊、內存、電源模塊、底板或機架，這些模塊可以按照一定規則組合配置。
在使用者看來，不必要詳細分析CPU的內部電路，但對各部分的工作機制還是應有足夠的理解。CPU的控制器控制CPU工作，由它讀取指令、解釋指令及執行指令。但工作節奏由震盪信號控制。運算器用於進行數字或邏輯運算，在控制器指揮下工作。寄存器參與運算，並存儲運算的中間結果，它也是在控制器指揮下工作。CPU速度和內存容量是PLC的重要參數，它們決定著PLC的工作速度，IO數量及軟體容量等，因此限制著控制規模。
PLC使用系統存儲器（現在大部分採用快閃記憶體技術了）用於過程式控制制系統。除了這個操作系統之外，它還包括一個由梯形圖翻譯成而進制形式的用戶程序。快擦型存儲器（FLASH memory）的內容只有在改變用戶程序的時候可以被改變。PLC控制器比快擦型存儲器使用得更早，EPROM存儲器比快擦型存儲器也更早，快擦型存儲器必須用紫外線（UV，Ultra-Violet Ray）燈擦除，並在編程器上進行編程。由於快擦型存儲器技術的應用，使得這個過程大大縮短了。在應用程序開發中，通過一個串列電纜可以對程序存儲器進行重新編程。
用戶存儲器被分成具有特殊功能的塊。一部分存儲器用來存儲輸入和輸出狀態。一個輸入的實際狀態存儲狀態存儲在專用存儲器位上，為「1」或者「0」。每一個輸入和輸出在存儲器中都有一個相應的位。另外一部分存儲器用來存儲用戶程序中的變數的內容。例如，定時器值，或者記數器值存放在存儲器的這個部分。
PLC控制器可以通過計算機（通常方式）重新編程，但是也可以通過人工編程器9控制台）編程。實際上，這意味著，如果你有編程所需要的軟體，早期PLC控制器可以通過計算機進行編程。今天的傳輸計算機是工廠自己對PLC控制器進行重新編程的理想設備。這對於工業企業來說是非常重要的。一旦系統修改結束，將正確的程序重新讀入PLC控制器也是非常重要的。定期檢查PLC中的程序是否改變是非常好的事情。這有助於避免車間發生危險情況（一些汽車製造商已經建立了通信網路，可以定期檢查PLC中的程序，以保證運行的程序都是正確的）。
幾乎所有用於為PLC控制器編程的程序都擁有各種不同的選項，例如系統輸入/輸出（I/O線）的強制開關，程序實時跟蹤以及圖表驗證。圖表驗證對於理解、定義失敗和故障非常必要。程序員可以添加標記，書日和輸出設備名稱，以及對於查找錯誤或者對於系統維護很有用的注釋。添加註釋和標記可以使技術人員（不僅僅是開發人員）很快理解梯形圖。注釋和標記甚至還可以准確地引用零件號，如果需要更換零件的話。這將加快由於損壞零件而引起的任何問題的修理速度。響應的舊方法是這樣的，開發系統的人必須保護這個程序，他旁邊再沒有人知道系統是怎樣完成的。正確的、備有證明文件的梯形圖使任何技術人員都能徹底理解系統的功能。
電源是為中央處理單元提供電源的。大部分PLC控制器的工作電壓為24VDC或者220VAC。在有些PLC控制器上，你可以看見作為獨立模塊的電源。用戶必須確定從I/O模塊取出多大電流來保證電源提供適當的電流。不同的模塊使用不同的電流量。
該電源一般不用於啟動外部輸入或輸出。用戶必須提供獨立的電源來啟動PLC控制器的輸入和輸出，因為這樣可以保證PLC控制器的所謂「純電源」。使用純電源意味著工業環境中的電源不會嚴重影響它。有些較小的PLC控制器從與PLC控制器集成在一起的小電源為它們的輸入提供電壓源。
④ 關於PLC的外文翻譯參考文獻急
http://www.doc88.com/p-774868595298.html到這看一下吧
http://wenku..com/view/df747b3010661ed9ad51f364.html這個也有一點