6AV6643-0CD01-1AX1

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描述

6AV6643-0CD01-1AX1

為了減少動(dòng)力電纜輻射電磁干擾，尤其是變頻裝置饋電電纜。筆者在某工程中，采用了銅帶鎧裝屏蔽電力電纜，從而降低了動(dòng)力線生產(chǎn)的電磁干擾，該工程投產(chǎn)后取得了滿意的效果。
不同類(lèi)型的信號(hào)分別由不同電纜傳輸，信號(hào)電纜應(yīng)按傳輸信號(hào)種類(lèi)分層敖設(shè)，嚴(yán)禁用同一電纜的不同導(dǎo)線同時(shí)傳送動(dòng)力電源和信號(hào)，避免信號(hào)線與動(dòng)力電纜靠近平行敖設(shè)，以減少電磁干擾。
硬件濾波及軟件抗干擾措施信號(hào)在接入計(jì)算機(jī)前，在信號(hào)線與地間并接電容，以減少共模干擾；在信號(hào)兩極間加裝濾波器可減少差模干擾。

由于電磁干擾的復(fù)雜性，要根本消除迎接干擾影響是不可能的，因此在DCS控制系統(tǒng)的軟件設(shè)計(jì)和組態(tài)時(shí)，還應(yīng)在軟件方面進(jìn)行抗干擾處理，進(jìn)一步提高系統(tǒng)的可靠性。常用的一些措施：數(shù)字濾波和工頻整形采樣，可有效消除周期性干擾；定時(shí)校正參考點(diǎn)電位，并采用動(dòng)態(tài)零點(diǎn)，可有效防止電位漂移；采用信息冗余技術(shù)，設(shè)計(jì)相應(yīng)的軟件標(biāo)志位；采用間接跳轉(zhuǎn)，設(shè)置軟件陷阱等提高軟件結(jié)構(gòu)可靠性。

接地的目的通常有兩個(gè)，其一為了安全，其二是為了抑制干擾。完善的接地系統(tǒng)是DCS控制系統(tǒng)抗電磁干擾的重要措施之一。
系統(tǒng)接地方式有：浮地方式、直接接地方式和電容接地三種方式。對(duì)DCS控制系統(tǒng)而言，它屬高速低電平控制裝置，應(yīng)采用直接接地方式。由于信號(hào)電纜分布電容和輸入裝置濾波等的影響，裝置之間的信號(hào)交換頻率一般都低于1MHz，所以DCS控制系統(tǒng)接地線采用一點(diǎn)接地和串聯(lián)一點(diǎn)接地方式。集中布置的DCS系統(tǒng)適于并聯(lián)一點(diǎn)接地方式，各裝置的柜體中心接地點(diǎn)以單獨(dú)的接地線引向接地極。如果裝置間距較大，應(yīng)采用串聯(lián)一點(diǎn)接地方式。用一根大截面銅母線（或絕緣電纜）連接各裝置的柜體中心接地點(diǎn)，然后將接地母線直接連接接地極。接地線采用截面大于22mm2的銅導(dǎo)線，總母線使用截面大于60mm2的銅排。接地極的接地電阻小于2Ω，接地極最好埋在距建筑物10~15m遠(yuǎn)處，而且DCS系統(tǒng)接地點(diǎn)必須與強(qiáng)電設(shè)備接地點(diǎn)相距10m以上。信號(hào)源接地時(shí)，屏蔽層應(yīng)在信號(hào)側(cè)接地；不接地時(shí)，應(yīng)在DCS側(cè)接地；信號(hào)線中間有接頭時(shí)，屏蔽層應(yīng)牢固連接并進(jìn)行絕緣處理，一定要避免多點(diǎn)接地；多個(gè)測(cè)點(diǎn)信號(hào)的屏蔽雙絞線與多芯對(duì)絞總屏電纜連接時(shí)，各屏蔽層應(yīng)相互連接好，并經(jīng)絕緣處理。選擇適當(dāng)?shù)慕拥靥巻吸c(diǎn)接點(diǎn)。

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(mén)子，摩托羅拉，安川。力士樂(lè)。ACSO，橫河等進(jìn)口品牌。 專(zhuān)業(yè)銷(xiāo)售進(jìn)口DCS? PLC系統(tǒng)備件模塊
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專(zhuān)業(yè)銷(xiāo)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(mén)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(lèi)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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