plc外文翻譯

1、<p><b>　　畢業(yè)設(shè)計(jì)外文翻譯</b></p><p>　　Under a lot of circumstances we are total to like to adopt the string to combine the conversion chip to carry on deliver, under this kind of circumstance not n

2、eed us to carry on to deposited the machine to establish too and complicatedly, but carry on the data exchanges through the data transmission instruction directly, but is not a very viable way in the correspondence, beca

3、use the PLC of the other party must has been wait for your data exportation at the time of sending out the data, it can't</p><p>　　When you are reading the book, you hear someone knock on door, you stop

4、to start up of affair, open the door and combine to continue with the one who knock on door a dialogue, the telephone of this time rang, you signal hint to connect a telephone, after connecting the telephone through, ret

5、urn overdo come together knock on door to have a conversation, after dialogue complete, you continue again to see your book, this kind of circumstance we are called the interruption to it, it has the authorit</p>

6、<p>　　The interruption is not only a, sometimes existing jointly with the hour several inside break, break off to have the preferred Class, they will carry out the interruption of the higher Class according to perso

7、n's request. This kind of breaks off the medium interruption to also became to break off the set. The Class that certainly break off is relevant according to various resources of CPU with internal PLC, also following

8、 a heap of capacity size of also relevant fasten.</p><p>　　The contents that break off has a lot of kinds, for example the exterior break off, correspondence in of send out and accept the interruption and se

9、ttle and the clock that count break off, still have the WDT to reset the interruption etc., they enriched the CPU to respond to the category while handle various business. Speak thus perhaps you can't comprehend the

10、internal structure and operation orders of the interruption completely also, we do a very small example to explain.</p><p>　　Each equipment always will not forget a button, it also is at we meet the urgent c

11、ircumstance use of, which is nasty to stop the button. When we meet the Human body trouble and surprised circumstances we as long as press it, the machine stops all operations immediately, and wait for processing the ove

12、r surprised empress recover the operation again. Nasty stop the internal I/ O of the internal CPU of the button conjunction PLC to connect up, be to press button an exterior to trigger signal for CP</p><p>　

13、　When we are work a work piece, giving the PLC a signal, counting PLC inner part the machine add 1 to compute us for a day of workload, a count the machine and can solve problem in brief, certainly they also can keep the

14、 data under the condition of dropping the electricity, urging the data not to throw to lose, this is also what we hope earnestly.</p><p>　　The PLC still has the function that the high class counts the machin

15、e, being us while accept some dates of high speed, the high speed that here say is the data of the in all aspects tiny second class, for example the bar code scanner is scanning the data continuously, calculating high-sp

16、eed signal of the data processor DSP etc., we will adopt the high class to count the machine to help we carry on count. It at the PLC carries out the procedure once discover that the high class counts the machine</p&g

17、t;<p>　　You heard too many this phrases perhaps:" crash", the meaning that is mostly is a workload of CPU to lead greatly, the internal resources shortage etc. the circumstance can't result in proced

18、ure circulate. The PLC also has the similar circumstance, there is a watchdog WDT in the inner part of PLC, we can establish time that a procedure of WDT circulate, being to appear the procedure to jump to turn the mista

19、ke in the procedure movement process or the procedure is busy, movement time of the proce</p><p>　　The PLC development has already entered for network ages of correspondence from the mode of the one, and tog

20、ether other works control the net plank and I/ O card planks to carry on the share easily. A state software can pass all se hardwires link, more animation picture of keep the view to carries on the control, and cans pass

21、 the Internet to carry on the control in the foreign land, the blast-off that is like the absolute being boat No.5 is to adopt this kind of way to make airship go up the sk</p><p>　　The development of the hi

22、gher layer needs our continuous effort to obtain. The PLC emergence has already affected a few persons fully, we also obtained more knowledge and precepts from the top one experience of the generation, coming to the cont

23、inuous development PLC technique, push it toward higher wave tide.</p><p>　　Knowing the available PLC network options and their best applications will ensure an efficient and flexible control system design.&

24、lt;/p><p>　　The programmable logic controller's (PLC's) ability to support a range of communication methods makes it an ideal control and data acquisition device for a wide variety of industrial automat

25、ion and facility control applications. However, there is some confusion because so many possibilities exist. To help eliminate this confusion, let's list what communications are available and when they would be best

26、applied.</p><p>　　To understand the PLC's communications versatility, let's first define the terms used in describing the various systems.</p><p>　　ASCII: This stands for "American

27、Standard Code for Information Interchange." As shown in Fig. 1, when the letter "A" is transmitted, for instance, it's automatically coded as "65" by the sending equipment. The receiving equi

28、pment translates the "65" back to the letter "A." Thus, different devices can communicate with each other as long as both use ASCII code.</p><p>　　ASCII module: This intelligent PLC modul

29、e is used for connecting PLCs to other devices also capable of communicating using ASCII code as a vehicle.</p><p>　　Bus topology: This is a linear local area network (LAN) arrangement, as shown in Fig. 2A,

30、in which individual nodes are tapped into a main communications cable at a single point and broadcast messages. These messages travel in both directions on the bus from the point of connection until they are dissipated b

31、y terminators at each end of the bus.</p><p><b>　　畢業(yè)設(shè)計(jì)外文翻譯</b></p><p>　　很多的情況下我們總喜歡采用串并轉(zhuǎn)換芯片來(lái)進(jìn)行傳輸，這種情況下不需要我們進(jìn)行過(guò)于復(fù)雜的寄存器設(shè)置了，而直接通過(guò)數(shù)據(jù)傳送指令進(jìn)行數(shù)據(jù)交流，但在通信中并不是一個(gè)十分可行的辦法，因?yàn)樵诎l(fā)送數(shù)據(jù)的時(shí)候?qū)Ψ降腜LC必須一直等待你的數(shù)

32、據(jù)輸出，它不能去做其他的工作。</p><p>　　當(dāng)你在看書(shū)的時(shí)候，你聽(tīng)到有人敲門(mén)、你停下手上的事情、去打開(kāi)門(mén)、并同敲門(mén)者對(duì)話(huà)、這個(gè)時(shí)候電話(huà)響了、你示意接個(gè)電話(huà)、在接完電話(huà)后、回過(guò)頭來(lái)同敲門(mén)者繼續(xù)對(duì)話(huà)、對(duì)話(huà)完畢后、你再繼續(xù)看你的書(shū)，這種情況我們把它稱(chēng)為中斷，它具有權(quán)威性，也具有優(yōu)先性，PLC具備了這樣的功能。它的特點(diǎn)在于我們?cè)谠O(shè)備的操作過(guò)程中可能會(huì)遇到緊急的突發(fā)事件，我們要立刻的停下手上的工作，去處理更重要的事

33、情，這種情況是我們經(jīng)常所遇到的，PLC在去執(zhí)行緊急的任務(wù)時(shí)，總會(huì)先保存目前的狀態(tài)，比如程序的地址，CPU的累加器數(shù)據(jù)等，就像我們?nèi)ラ_(kāi)門(mén)時(shí)要記下我們看的書(shū)在第幾頁(yè)了或者干脆作個(gè)記號(hào)，因?yàn)槲覀兇龝?huì)還要繼續(xù)接著看后面的書(shū)。CPU總是按照我們的意愿去做應(yīng)該做的事情，但你錯(cuò)誤的給它一件事情，它也會(huì)同樣的去做，這一點(diǎn)我們必須注意。</p><p>　　中斷并不是只有一個(gè)，有時(shí)會(huì)同時(shí)存在幾個(gè)中斷，中斷具有優(yōu)先的級(jí)別，他們會(huì)根據(jù)

34、人的要求去執(zhí)行更高級(jí)別的中斷。這種中斷中的中斷也就形成了中斷嵌套。當(dāng)然中斷的級(jí)別根據(jù)各種PLC內(nèi)部CPU的資源有關(guān)，同時(shí)也跟堆棧的容量大小也有關(guān)系。</p><p>　　中斷的內(nèi)容有很多種，比如外部中斷、通信中的發(fā)送和接受中斷、定時(shí)和計(jì)數(shù)的時(shí)鐘中斷、還有WDT復(fù)位中斷等，它們豐富了CPU在處理各種事務(wù)時(shí)響應(yīng)種類(lèi)。這樣講也許你并不能完全理解中斷的內(nèi)部結(jié)構(gòu)和操作順序，我們做一個(gè)小小的例子來(lái)說(shuō)明.</p>

35、<p>　　每一個(gè)設(shè)備總是不會(huì)忘記有一個(gè)按鈕，它也是在我們遇到緊急情況時(shí)使用的，那就是急停按鈕。當(dāng)我們遇到人身事故和意外情況時(shí)我們只要按下它，機(jī)器立即停止所有的操作，并等待處理完意外后再恢復(fù)操作。急停按鈕連接PLC內(nèi)部CPU的內(nèi)部I/O接口上，當(dāng)按鈕給CPU一個(gè)外部觸發(fā)信號(hào)時(shí)，CPU對(duì)I/O進(jìn)行再次檢測(cè)，當(dāng)確認(rèn)有外部觸發(fā)信號(hào)時(shí)，CPU保護(hù)現(xiàn)場(chǎng)并將程序計(jì)數(shù)器自動(dòng)轉(zhuǎn)到相應(yīng)的外部I/O中斷程序中去，當(dāng)外部中斷程序處理完畢，程序計(jì)數(shù)

36、器返回到主程序繼續(xù)工作。有一點(diǎn)可以說(shuō)明的是我們一般會(huì)把急停按鈕的外部中斷升至最高級(jí)別，從而保證安全。</p><p>　　當(dāng)我們?cè)诠ぷ魍暌粋€(gè)工件時(shí)，給PLC一個(gè)信號(hào)，將PLC的內(nèi)部計(jì)數(shù)器加1來(lái)計(jì)算我們一天的工作量時(shí)，一個(gè)簡(jiǎn)單的計(jì)數(shù)器能解決問(wèn)題，當(dāng)然它們也能夠在掉電的情況下保持?jǐn)?shù)據(jù)，促使數(shù)據(jù)不丟失，這也是我們所渴望的。</p><p>　　PLC還具有高級(jí)計(jì)數(shù)器的功能，當(dāng)我們?cè)诮邮芤恍└咚俚?/p>

37、數(shù)據(jù)時(shí)，這里所說(shuō)的高速是在在微秒級(jí)的數(shù)據(jù)，比如條碼掃描機(jī)在不斷的掃描數(shù)據(jù)，數(shù)據(jù)處理器DSP計(jì)算的高速信號(hào)等，我們就要采用到高級(jí)計(jì)數(shù)器來(lái)幫助我們進(jìn)行計(jì)數(shù)。它在PLC執(zhí)行程序時(shí)一旦發(fā)現(xiàn)高級(jí)計(jì)數(shù)器對(duì)應(yīng)的中斷，就會(huì)立即放下手上的工作。經(jīng)過(guò)再次編程的梯形圖程序說(shuō)明我們?cè)趫?zhí)行程序時(shí)高級(jí)計(jì)數(shù)器會(huì)自動(dòng)的執(zhí)行對(duì)應(yīng)的工作，從而將高級(jí)計(jì)數(shù)器的級(jí)別升至高一級(jí)別。</p><p>　　你也許聽(tīng)過(guò)太多的這個(gè)詞:“死機(jī)”，大致的意思是CPU工

38、作量過(guò)大，內(nèi)部資源不足等情況造成程序無(wú)法運(yùn)行。PLC也有類(lèi)似的情況，在PLC內(nèi)部有一個(gè)看門(mén)狗WDT，我們可以設(shè)置WDT一個(gè)程序運(yùn)行的時(shí)間，當(dāng)程序運(yùn)行過(guò)程中出現(xiàn)程序跳轉(zhuǎn)錯(cuò)誤時(shí)或者程序繁忙時(shí)，程序的運(yùn)行時(shí)間超過(guò)WDT的設(shè)置時(shí)間，CPU轉(zhuǎn)而WDT復(fù)位狀態(tài)。程序重新開(kāi)始運(yùn)行，但對(duì)中斷不會(huì)進(jìn)行破壞。</p><p>　　PLC的發(fā)展已經(jīng)從單一的模式進(jìn)入了通信的網(wǎng)絡(luò)時(shí)代，并同其它的工控網(wǎng)板和I/O卡板輕易的進(jìn)行共享。組態(tài)軟件

39、可以將所有的這些硬件連接起來(lái)，通過(guò)更直觀的動(dòng)畫(huà)圖片來(lái)進(jìn)行控制，并可以通過(guò)互聯(lián)網(wǎng)在異地進(jìn)行控制，像神舟五號(hào)的發(fā)射就是采用這種辦法來(lái)使飛船升空。</p><p>　　更高層次的發(fā)展需要我們不斷的努力來(lái)取得。PLC的出現(xiàn)已經(jīng)足足影響了幾代人，我們也從上一輩的經(jīng)驗(yàn)中獲取了更多的知識(shí)和教訓(xùn)，來(lái)不斷的發(fā)展PLC技術(shù)，將它推向更高浪潮。</p><p>　　了解可用的PLC網(wǎng)絡(luò)的最佳選擇，其應(yīng)用將確保有

40、效率和靈活的控制系統(tǒng)設(shè)計(jì)?？删幊踢壿嬁刂破鳎≒LC的）能夠支持多種通信方法的范圍，使之成為一個(gè)理想的控制和工業(yè)自動(dòng)化和控制應(yīng)用各種設(shè)施數(shù)據(jù)采集裝置。然而，有一些混亂，因?yàn)檫@么多的可能性存在。為了幫助消除這種混亂，讓我們的通訊名單，可什么時(shí)候他們會(huì)是最好的應(yīng)用。</p><p>　　CPU：這代表“中央處理單元”，這其實(shí)就是一臺(tái)計(jì)算機(jī)，可編程控制器，智能設(shè)備或其他地方的算術(shù)和邏輯運(yùn)算的執(zhí)行和指令被解碼和執(zhí)行的一部分

41、。</p><p>　　菊花鏈：這是對(duì)單個(gè)設(shè)備中的PLC網(wǎng)絡(luò)，連接描述在那里，每個(gè)設(shè)備連接到下一個(gè)和通信信號(hào)從一個(gè)單位傳遞到下一個(gè)順序的方式。</p><p>　　分布式控制：這是一個(gè)自動(dòng)化的概念，即一個(gè)自動(dòng)化系統(tǒng)的部分是由單獨(dú)的控制器，這是在位于其附近地區(qū)的直接控制（控制分散控制系統(tǒng)及遍布出）。</p><p>　　為了了解PLC的通信多功能性，讓我們首先定義描述

42、的各種制度的用語(yǔ)：</p><p>　　ASCII碼：這代表著信息交換。1，當(dāng)字母“A”是傳播，例如，它會(huì)自動(dòng)編碼為“65由發(fā)送設(shè)備”。接收設(shè)備轉(zhuǎn)換的“65”回答。因此，不同的設(shè)備可以相互通信既是使用ASCII代碼的其他長(zhǎng)。</p><p>　　ASCII的模塊：這個(gè)智能PLC模塊是用于連接到PLC的通信也使用ASCII碼作為車(chē)輛等設(shè)備的能力。</p><p>