1747-L552

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描述

1747-L552

PLC編程語(yǔ)言與一般計(jì)算機(jī)語(yǔ)言相比，具有明顯的特點(diǎn)，它既不同于高級(jí)語(yǔ)言，也不同與一般的匯編語(yǔ)言，它既要滿足易于編寫，又要滿足易于調(diào)試的要求。目前，還沒(méi)有一種對(duì)各廠家產(chǎn)品都能兼容的編程語(yǔ)言。如三菱公司的產(chǎn)品有它自己的編程語(yǔ)言，OMRON公司的產(chǎn)品也有它自己的語(yǔ)言。但不管什么型號(hào)的PLC，PLC編程語(yǔ)言都具有以下特點(diǎn)：

? ? 1.圖形式指令結(jié)構(gòu)：程序由圖形方式表達(dá)，指令由不同的圖形符號(hào)組成，易于理解和記憶。系統(tǒng)的軟件開(kāi)發(fā)者已把工業(yè)控制中所需的獨(dú)立運(yùn)算功能編制成象征性圖形，用戶根據(jù)自己的需要把這些圖形進(jìn)行組合，并填入適當(dāng)?shù)膮?shù)。在邏輯運(yùn)算部分，幾乎所有的廠家都采用類似于繼電器控制電路的梯形圖，很容易接受。如西門子公司還采用控制系統(tǒng)流程圖來(lái)表示，它沿用二進(jìn)制邏輯組件圖形符號(hào)來(lái)表達(dá)控制關(guān)系，很直觀易懂。較復(fù)雜的算術(shù)運(yùn)算、定時(shí)計(jì)數(shù)等，一般也參照梯形圖或邏輯組件圖給予表示，雖然象征性不如邏輯運(yùn)算部分，也受用戶歡迎
? ? 2.明確的變數(shù)常數(shù)：圖形符相當(dāng)于操作碼，規(guī)定了運(yùn)算功能，操作數(shù)由用戶填人，如：K400，T120等。PLC中的變量和常數(shù)以及其取值范圍有明確規(guī)定，由產(chǎn)品型號(hào)決定，可查閱產(chǎn)品目錄手冊(cè)。
? ? 3.簡(jiǎn)化的程序結(jié)構(gòu)：PLC的程序結(jié)構(gòu)通常很簡(jiǎn)單，典型的為塊式結(jié)構(gòu)，不同塊完成不同的功能，使程序的調(diào)試者對(duì)整個(gè)程序的控制功能和控制順序有清晰的概念。
? ? 4.簡(jiǎn)化應(yīng)用軟件生成過(guò)程：使用匯編語(yǔ)言和高級(jí)語(yǔ)言編寫程序，要完成編輯、編譯和連接三個(gè)過(guò)程，而使用編程語(yǔ)言，只需要編輯一個(gè)過(guò)程，其余由系統(tǒng)軟件自動(dòng)完成，整個(gè)編輯過(guò)程都在人機(jī)對(duì)話下進(jìn)行的，不要求用戶有高深的軟件設(shè)計(jì)能力。
? ? 5.強(qiáng)化調(diào)試手段：無(wú)論是匯編程序，還是高級(jí)語(yǔ)言程序調(diào)試，都是令編輯人員頭疼的事，而PLC的程序調(diào)試提供了完備的條件，使用編程器，利用PLC和編程器上的按鍵、顯示和內(nèi)部編輯、調(diào)試、監(jiān)控等，并在軟件支持下，診斷和調(diào)試操作都很簡(jiǎn)單。
? ? 總之，PLC的編程語(yǔ)言是面向用戶的，對(duì)使用者不要求具備高深的知識(shí)、不需要長(zhǎng)時(shí)間的專門訓(xùn)練。

產(chǎn)品承諾：
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保?證?安全準(zhǔn)時(shí)發(fā)貨，
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優(yōu)勢(shì)價(jià)格，大量現(xiàn)貨。

主營(yíng)DCS系統(tǒng)配件
機(jī)器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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NetApp FAS980 w/2x DS14MK2 14x 300GB 10K X276A 8.4TB!!

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專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊

PLC模塊，可編程控制器，CPU模塊，IO模塊，AI模塊，通訊模塊。AB/施耐德/ABB/GE/本特利/西屋/英維斯/霍尼韋爾/黑馬/FU克斯波羅

15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國(guó)內(nèi)實(shí)力庫(kù)存商家


選擇深圳長(zhǎng)欣，選擇放心，售后無(wú)憂大量現(xiàn)貨，當(dāng)天順豐發(fā)貨！
主營(yíng)：本特利，英維思，伍德沃德，福克斯波羅、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門子、摩托羅拉、GE發(fā)那科、安川、博世力士樂(lè)，ACSO，力士樂(lè)等各大品牌的DCS系統(tǒng)配件，機(jī)器人系統(tǒng)配件，大型伺服系統(tǒng)備件。

先介紹幾點(diǎn)經(jīng)驗(yàn)。
1、先通讀一遍“系統(tǒng)手冊(cè)”（不管能不能看懂，先了解個(gè)大概，以便學(xué)習(xí)編程時(shí)查找）；
2、由位控邏輯入手，逐漸增加定時(shí)、計(jì)數(shù)等條件，把或、與、非關(guān)系理順；
3、進(jìn)而練習(xí)整數(shù)運(yùn)算、實(shí)數(shù)運(yùn)算、類型轉(zhuǎn)換；
4、量程轉(zhuǎn)換、PID調(diào)節(jié)回路的建立及P、I、D參數(shù)的理解（最好是有個(gè)物理回路驗(yàn)證，比如變頻器+電機(jī)+測(cè)速傳感器）；
5、循環(huán)、順序、跳轉(zhuǎn)等程序控制（盡量避免跳轉(zhuǎn)，非跳不可時(shí)也是跳的越近越好）；
6、中斷、通訊、位置控制....

本人以ABB工業(yè)機(jī)器人配件DSQC系列和Motorola MVME系列，GE 卡件 模塊 驅(qū)動(dòng)器系列為主攻。各位電工朋友可根據(jù)自己的條件選擇適合自己的PLC品牌，由于PLC的基本框架大同小異，學(xué)會(huì)一種至于其它的學(xué)習(xí)起來(lái)也就簡(jiǎn)單了。

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