外文翻譯--plc控制系統(tǒng)設(shè)計的要點(文件)
【正文】 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 networking, 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。 At the same time, some manufacturers of individual products do not support the expansion module directives, in software development, we must pay attention to. When using such simulation module temperature, some of the manufacturers, see related technical manuals. Many types of panies expansion modules, such as singleinput modules, single output modules, input output modules, temperature modules, highspeed input module. This modular design Plc product development provided for the convenience of users.When using a Plc network design, its much more difficult to control than single Plc. First you should choose their own more familiar type, its basic instructions and a more indepth understanding of the functional mands, and the speed and direction of the implementation of storage capacity users should also be careful about the procedure. Otherwise, you can not adapt to the realtime requirements, resulting in the collapse of the system. In addition to munications interfaces, munication protocols, data transmission speed should also be considered. Finally, we must seek to Plc businessmen network design and software technical support and detailed technical information for the selection of several workstations in your system size.In the preparation of the software, should first bee familiar with the use of Plc software products specification, the question skilled later programming. If using graphical programming device or software package programming may direct programming, if using handheld programming device programming, should be painted Trapezoid Chart before programming, so can less mistakes speed was fast. After the first air conditioning programming procedures to be normal functioning of all, again in equipment debugging.PLC控制系統(tǒng)設(shè)計的要點可編程序控制器 (可設(shè)計的控制器) 本來應簡稱個人計算機，為了與個人計算機的簡稱個人計算機相區(qū)別,一般將它簡稱為 PLC(可設(shè)計的邏輯控制器)。計算機代替了一個過程控制所需的許多外部配線。 微 PLC 數(shù)年以前進入了市場，一些人認為這些裝置降到最低點。這些 PLCs 主要安裝在汽車的植物中。重新規(guī)劃程序的 PLC 鍵盤代替了大量電線，繼電器, 讓轉(zhuǎn)換時間變成大約幾天。 所有類型的機器人，自動化 裝置和計算機，包括 PLC, 都有了許多進步 。 PLC的市場已經(jīng)從1978 年八千萬元開始到1990年以每年十億元的幅度增長而且仍然正在增加。一個在繼電器邏輯系統(tǒng)方面有豐富知識的人,能在很短的時間內(nèi)掌握主要的 PLC 功能, 這些功能可能包括盤繞卷，接觸器，定時器和計數(shù)器。 學校和操作手冊在掌握這些先進的功能方面非常有幫助。 過去, 每個不同的電子受約束的生產(chǎn)機器需要自己的控制器；15 部機器可能需要 15 個不同的控制器。 當改變一個 PLC 編程線路或序列設(shè)計的時候, PLC 編程能在數(shù)分鐘內(nèi)從鍵盤序列中改變。 有需要花時間去設(shè)計和安裝新的繼電器和繼電器觸點. 使用 PLC ，不過只有三個多觸點。 增加的技術(shù)濃縮較多的功能為較小的和不貴的包。 程序能被打印，測試，觀察，而且如果需要可以修正, 節(jié)約了工廠的時間。當他們被激活時，邏輯路徑在熒屏上顯示。 先進的 PLC 系統(tǒng)也可能有每個線路元件的功能描述。 PLC 編程被一個電學家或技術(shù)人員在梯型圖中完成。近幾年，PLC產(chǎn)品的價格有較大的下降，其性價比越來越高，這是眾多技術(shù)人員選用PLC的重要原因。不同的負載選用不同的輸出方式，對系統(tǒng)的穩(wěn)定運行是很重要的。一般存儲容量越大、速度越快的PLC價格就越高，但應該根據(jù)系統(tǒng)的大小合理選用PLC產(chǎn)品。
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