外文翻譯--plc控制系統(tǒng)設(shè)計(jì)的要點(diǎn)-plc設(shè)計(jì)-文庫(kù)吧在線文庫(kù)
【正文】 Mitsubishi, FUJJ, ANASONIC, Germany Siemens, Korean LG. In recent years, Plc greater decline in the prices of products, increasing its performance cost rate. This is a technical staff chosen Plc important reasons. Then, how to purchase Plc products? First, the system should first determine the size of single control system with Plc or using Plc working, thus calculating Plc importing, exporting. Few, and in some Plc to be in real need have a certain cushion Second, determine the type of load under Plc exportled type of load is the DC or exchangetype, big or small currents, and Plc export points such as the frequency of movements, the use of relays to determine exportexport, or transistor output, or goods of export gates. Different load choose different ways to export to the operating system39。 When a larger system, we must expand. Different panies products to the total points system and the expansion of the number of modules have limitations when expansion can not meet the requirements, can work structure。 今天 , 在 PLC工業(yè)中的大單位增長(zhǎng)就要結(jié)束 因?yàn)樾〉淖兊迷絹碓叫 ? 主要耗時(shí)的轉(zhuǎn)換程序之一已經(jīng)是新的配線或者校訂了的繼電器和控制嵌板。 一些大的電子學(xué)和計(jì)算機(jī)公司和一些不同的企業(yè)電子學(xué)機(jī)構(gòu)發(fā)現(xiàn) PLC 已經(jīng)成為他們最好銷售量的產(chǎn)品。 一個(gè)有豐富繼電器邏輯知識(shí)的人 ,在幾天之內(nèi) ,通過適當(dāng)?shù)闹笇?dǎo)就能掌握先進(jìn)的 PLC 功能。 當(dāng)使用線路繼電器面板時(shí) , 任何的程序改變需要面板和裝置的重寫時(shí)間。 ④降低費(fèi)用。 電路的運(yùn)行或運(yùn)行不當(dāng)能被 觀察到。 ⑧梯型圖和布爾編程方法。 ② 確定負(fù)載類型根據(jù) PLC 輸出端所帶的負(fù)載是直流型還是交流型，是大電流還是小電流，以及PLC 輸出點(diǎn)動(dòng)作的頻率等，從而確定輸出端采用繼電器輸出，還是晶體管輸出，或品閘管輸出。 用圖形編程器編程，該編程器采用梯形圖編程，方便直觀，一般的電氣人員短期內(nèi)就可應(yīng)用自如，但該編程器價(jià)格較高。 PLC 的這種模塊化設(shè)計(jì)為用戶的產(chǎn)品開發(fā)提供了方便。編程結(jié)束后先空調(diào)程序，待各個(gè) 動(dòng)作正常后，再在設(shè)備上調(diào)試。另外，對(duì)通信接口、通信協(xié)議、數(shù)據(jù)傳送速度等也要考慮。 對(duì)于小的系統(tǒng)，如 80 點(diǎn)以內(nèi)的系統(tǒng)．一般不需要擴(kuò)展 ；當(dāng)系統(tǒng)較大時(shí)，就要擴(kuò)展。各個(gè)公司的開發(fā)軟件都不相同，而用戶程序的存儲(chǔ)容量和指令的執(zhí)行速度是兩個(gè)重要指標(biāo)。硬件選購(gòu)目前市場(chǎng)上的 PLC 產(chǎn)品眾多，除國(guó)產(chǎn)品牌外，國(guó)外有：日本的 OMRON、 MITSUBISHI、 FUJJ、 ANASONIC, 德國(guó)的 SIEMENS，韓國(guó)的 LG 等。當(dāng)故障被 PLC 邏輯發(fā)現(xiàn)的時(shí)候，故障描述在熒屏上出現(xiàn)。編程后的 PLC能在辦公室或?qū)嶒?yàn)室被評(píng)估。 PLC 有很多的接觸器，假設(shè)一個(gè)面板線路繼電器有四個(gè)觸點(diǎn) ,當(dāng)一個(gè)設(shè)計(jì)需要三個(gè)或以上觸點(diǎn)時(shí) ,所有的都被用了。 ①?gòu)?qiáng)的適應(yīng)性。 PLC在家用產(chǎn)品和醫(yī)療器材中的非傳統(tǒng)使用已經(jīng)在 1990 年代出現(xiàn)暴長(zhǎng) ,而且在我們進(jìn)入新的千年將繼續(xù)增長(zhǎng)。 1970 年代后期 , PLC 編程的改進(jìn)使用其成為更方便的使用；在 1978 年，微處理器片的引進(jìn)為各種的自動(dòng)化 系統(tǒng)增加了計(jì)算機(jī)能力而且降低計(jì)算機(jī)費(fèi)用。 在 1960 年代后期和 1970 年代早期內(nèi)從傳統(tǒng)的計(jì)算機(jī)進(jìn)展而 來的第一個(gè) PLC 系統(tǒng)。 本質(zhì)上 , 一個(gè) PLC 的操作員在一個(gè)展覽熒屏之上用一個(gè)鍵盤畫梯圖表的線和裝置 . 產(chǎn)生的圖畫轉(zhuǎn)換成計(jì)算機(jī)機(jī)器語(yǔ)言和作為一個(gè)用戶程序運(yùn)行。 in 1978, the introduction of the microprocessor chip increased puter power for all kinds of automotion systems and lowered the puting cost. Robotics, automotion devices, and puters of all types, including the PLC, consequently underwent many improvements. PLC programs, written in highlevel language, became more understandable to more people, and PLCs became more affordable. In the 1980s, with more puter power per dollar available, the PLC came into exponentially increasing use. Some large electronics and puter panies and some diverse corporate electronics divisions found that the PLC had bee their greatest volume product. The market for PLCs grew from a volume of $80 million in 1978 to $1 billion per year by 1990 and is still growing. Even the machine tool industry, where pute numerical controls (CNCs) have been used in the past, is using PLCs. PLCs are also used extensively in building energy and security control systems. Other nontraditional uses of PLCs, such as in the home and in medical equipment, haved exploded in the 1990s and will increase as we enter the new millennium. A person knowledgeable in relay logic systems can master the major PLC functions in a few hours, These functions might include coils, contacts, ti
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