DSQC651

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描述

DSQC651

? 1．I/O點(diǎn)數(shù)的估算
? ? 在選機(jī)型時(shí)，應(yīng)保證I/O點(diǎn)數(shù)有15～20%的余量。
? ? 2．內(nèi)存容量的估算
? ? 用戶程序所占內(nèi)存容量受I/O點(diǎn)數(shù)、用戶程序編制水平等因素的影響，程序越短，程序執(zhí)行的掃描周期就越短。
? ? 估算內(nèi)存大小可根據(jù)下列方法來(lái)確定：
? ? 1）開(kāi)關(guān)量I/O點(diǎn)數(shù)：
? ? 一般PLC的開(kāi)關(guān)量I/O點(diǎn)數(shù)的比值為3/2（CPM1A）或1/1（FX2N），因此根據(jù)I/O總點(diǎn)數(shù)所需的內(nèi)存容量為：
? ? 所需內(nèi)存步數(shù)=I/O開(kāi)關(guān)量總點(diǎn)數(shù)×（10～15）
? ? 2）模擬量I/O總點(diǎn)數(shù)
? ? 具有模擬量控制要求的系統(tǒng)要用到數(shù)據(jù)傳送和運(yùn)算等功能指令，所占內(nèi)存較多，其內(nèi)存容量可按下式計(jì)算：
? ? 所需內(nèi)存步數(shù)=模擬量I/O總點(diǎn)數(shù)×（200～250）
? ? 3）程序編寫的質(zhì)量
? ? 設(shè)計(jì)人員的編程水平直接影響到程序的長(zhǎng)短及運(yùn)行時(shí)間。
? ? 綜上所述，估算PLC所需內(nèi)存的總?cè)萘繛椋?/div>
? ? 開(kāi)關(guān)量I/O總點(diǎn)數(shù)×（10～15）+模擬量I/O總點(diǎn)數(shù)×（200～250）+30%的余量
? ? 3、響應(yīng)時(shí)間
? ? 系統(tǒng)響應(yīng)時(shí)間：指輸入信號(hào)產(chǎn)生時(shí)刻與輸出信號(hào)狀態(tài)發(fā)生變化的時(shí)間間隔，若輸入信號(hào)的變化頻率快于一個(gè)掃描周期，系統(tǒng)就不能可靠地響應(yīng)每個(gè)輸入信號(hào)，這時(shí)應(yīng)盡量縮短程序，提高響應(yīng)速度。
? ? 4、功能要求與PLC結(jié)構(gòu)的合理性
? ? 1）不需要PLC之間通訊，系統(tǒng)規(guī)模較小，可考慮用整體式結(jié)構(gòu)的PLC。
? ? 2）既有開(kāi)關(guān)量控制，又有模擬量控制，以及通訊要求等大中型控制系統(tǒng)，可考慮用模塊式結(jié)構(gòu)，易于功能的擴(kuò)展，同時(shí)模塊式結(jié)構(gòu)一旦發(fā)生故障比較容易排除。

產(chǎn)品承諾：
保?證?全新原裝進(jìn)口,
保?證?安全準(zhǔn)時(shí)發(fā)貨，
保?證售后服務(wù)質(zhì)量，
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
品牌：ABB???,AB??,GE,FOXBORO,本特利，英維思，伍德沃德，西屋，瑞恩，施耐德，西門子，摩托羅拉，安川。力士樂(lè)。ACSO，橫河等進(jìn)口品牌。 專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊
Triconex?Siemens?Yaskawa?ABB?GE?Ovation?AB?Foxboro?Motorola?Schneider?XYCOM?KUKA ? 專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊 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

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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，?？怂共_、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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