6GK5408-2FD00-2AA2

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描述

6GK5408-2FD00-2AA2

?接地是提高電子設(shè)備電磁兼容性（EMC）的有效手段之一。正確的接地，既能抑制電磁干擾的影響，又能抑制設(shè)備向外發(fā)出干擾；而錯(cuò)誤的接地，反而會(huì)引入嚴(yán)重的干擾信號(hào)，使DCS系統(tǒng)將無(wú)法正常工作。
DCS控制系統(tǒng)的地線包括系統(tǒng)地、屏蔽地、交流地和保護(hù)地等。接地系統(tǒng)混亂對(duì)DCS系統(tǒng)的干擾主要是各個(gè)接地點(diǎn)電位分布不均，不同接地點(diǎn)間存在地電位差，引起地環(huán)路電流，影響系統(tǒng)正常工作。例如電纜屏蔽層必須一點(diǎn)接地，如果電纜屏蔽層兩端A、B都接地，就存在地電位差，有電流流過(guò)屏蔽層，當(dāng)發(fā)生異常狀態(tài)如雷擊時(shí)，地線電流將更大。

此外，屏蔽層、接地線和大地有可能構(gòu)成閉合環(huán)路，在變化磁場(chǎng)的作用下，屏蔽層內(nèi)有會(huì)出現(xiàn)感應(yīng)電流，通過(guò)屏蔽層與芯線之間的耦合，干擾信號(hào)回路。若系統(tǒng)地與其它接地處理混亂，所產(chǎn)生的地環(huán)流就可能在地線上產(chǎn)生不等電位分布，影響DCS內(nèi)邏輯電路和模擬電路的正常工作。DCS工作的邏輯電壓干擾容限較低，邏輯地電位的分布干擾容易影響DCS的邏輯運(yùn)算和數(shù)據(jù)存貯，造成數(shù)據(jù)混亂、程序跑飛或死機(jī)。模擬地電位的分布將導(dǎo)致測(cè)量精度下降，引起對(duì)信號(hào)測(cè)控的嚴(yán)重失真和誤動(dòng)作。主要由系統(tǒng)內(nèi)部元器件及電路間的相互電磁輻射產(chǎn)生，如邏輯電路相互輻射及其對(duì)模擬電路的影響，模擬地與邏輯地的相互影響及元器件間的相互不匹配使用等。這都屬于DCS制造廠對(duì)系統(tǒng)內(nèi)部進(jìn)行電磁兼容設(shè)計(jì)的內(nèi)容，比較復(fù)雜，作為應(yīng)用部門是無(wú)法改變，可不必過(guò)多考慮，但要選擇具有較多應(yīng)用實(shí)績(jī)或經(jīng)過(guò)考驗(yàn)的系統(tǒng)。

?為了保證系統(tǒng)在工業(yè)電磁環(huán)境中免受或減少內(nèi)外電磁干擾，必須從設(shè)計(jì)階段開始便采取三個(gè)方面抑制措施：抑制干擾源；切斷或衰減電磁干擾的傳播途徑；提高裝置和系統(tǒng)的抗干擾能力。這三點(diǎn)就是抑制電磁干擾的基本原則。DCS控制系統(tǒng)的抗干擾是一個(gè)系統(tǒng)工程，要求制造單位設(shè)計(jì)生產(chǎn)出具有較強(qiáng)抗干擾能力的產(chǎn)品，且有賴于使用部門在工程設(shè)計(jì)、安裝施工和運(yùn)行維護(hù)中予以全面考慮，并結(jié)合具有情況進(jìn)行綜合設(shè)計(jì)，才能保證系統(tǒng)的電磁兼容性和運(yùn)行可靠性。進(jìn)行具體工程的抗干擾設(shè)計(jì)時(shí)，應(yīng)主要以下兩個(gè)方面。

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
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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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