IC670GBI002G

分類:
選擇深圳長欣,選擇放心,售后無憂
大量現(xiàn)貨,當(dāng)天順豐發(fā)貨!
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描述

IC670GBI002G

來自PLC系統(tǒng)內(nèi)部的干擾。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、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PLC制造廠家對(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)用部門無法改變,可不必過多考慮,但要選擇具有較多應(yīng)用實(shí)績或經(jīng)過考驗(yàn)的系統(tǒng)。抗干擾設(shè)計(jì)
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。PLC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)合具體情況進(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)主要注意以下兩個(gè)方面。設(shè)備選型。
在選擇設(shè)備時(shí),首先要選擇有較高抗干擾能力的產(chǎn)品,其包括了電磁兼容性,尤其是抗外部干擾能力,如采用浮地技術(shù)、隔離性能好的PLC系統(tǒng);其次還應(yīng)了解生產(chǎn)廠家給出的抗干擾指標(biāo),如共模抑制比、差模抑制比、耐壓能力、允許在多大電場強(qiáng)度和多高頻率的磁場強(qiáng)度環(huán)境中工作等;另外是靠考查其在類似工作中的應(yīng)用實(shí)績。
在選擇國外進(jìn)口產(chǎn)品要注意,我國是采用220V高內(nèi)阻電網(wǎng)制式,而歐美地區(qū)是110V低內(nèi)阻電網(wǎng)。由于我國電網(wǎng)內(nèi)阻大,零點(diǎn)電位漂移大,地電位變化大,工業(yè)企業(yè)現(xiàn)場的電磁干擾至少要比歐美地區(qū)高4倍以上,對(duì)系統(tǒng)抗干擾性能要求更高。在國外能正常工作的PLC產(chǎn)品在國內(nèi)工業(yè)就不一定能可靠運(yùn)行,這就要在采用國外產(chǎn)品時(shí),按我國的標(biāo)準(zhǔn)(GB/T13926)合理選擇。
綜合抗干擾設(shè)計(jì)。主要考慮來自系統(tǒng)外部的幾種抑制措施,內(nèi)容包括:對(duì)PLC系統(tǒng)及外引線進(jìn)行屏蔽以防空間輻射電磁干擾;對(duì)外引線進(jìn)行隔離、濾波,特別是動(dòng)力電纜應(yīng)分層布置,以防通過外引線引入傳導(dǎo)電磁干擾;正確設(shè)計(jì)接地點(diǎn)和接地裝置,完善接地系統(tǒng)。另外還必須利用軟件手段,進(jìn)一步提高系統(tǒng)的安全可靠性。主要抗干擾措施

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)勢價(jià)格,大量現(xiàn)貨。

主營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。ACSO,橫河等進(jìn)口品牌。Triconex?Siemens?Yaskawa?ABB?GE?Ovation?AB?Foxboro?Motorola?Schneider?XYCOM?KUKA

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選擇深圳長欣,選擇放心,售后無憂大量現(xiàn)貨,當(dāng)天順豐發(fā)貨!
主營: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,ACSO,力士樂等各大品牌的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)起來也就簡單了。