FOXBORO FBM216

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描述

FOXBORO FBM216
來(lái)自空間的輻升干擾
空間的輻射電磁場(chǎng)主要由電力網(wǎng)絡(luò)、電氣設(shè)備的暫態(tài)過(guò)程、雷電、無(wú)線電廣播、電視、雷達(dá)、高頻感應(yīng)加熱設(shè)備等產(chǎn)生的,通常成為輻射干擾,其分布極為復(fù)雜。若PLC系統(tǒng)置于所射頻場(chǎng)內(nèi),就回收到輻射于擾,其影響主要通過(guò)兩條路徑:一是直接對(duì)PLC內(nèi)部的輻射,由電路感應(yīng)產(chǎn)生干擾;二是對(duì)PLC通信內(nèi)網(wǎng)絡(luò)的輻射,由通信線路的感應(yīng)引人干擾。輻射于擾與現(xiàn)場(chǎng)設(shè)備布置及設(shè)備所產(chǎn)生的電磁場(chǎng)大小,特別是頻率有關(guān),一般通過(guò)設(shè)置屏蔽電纜和PLC局部屏蔽及高壓泄放元件進(jìn)行保護(hù)。
來(lái)自系統(tǒng)外引線的干擾
來(lái)自電源的干擾。PLC系統(tǒng)的正常供電電源均由電網(wǎng)供電。山于電網(wǎng)覆蓋范圍廣,它將受到所有空間電磁干擾而在線路上感應(yīng)電壓和電路。尤其是電網(wǎng)內(nèi)部的變化,開關(guān)操作浪涌,大型電力設(shè)備起停、交直流傳動(dòng)裝置引起的諧波、電網(wǎng)短路狀態(tài)沖擊等,都通過(guò)輸電線路傳到電源里邊。PLC電源通常采用隔離電源。但其機(jī)構(gòu)及制造工藝因素使其隔離性能并不理想。實(shí)際上,由于分布參數(shù)特別是分布電容的存在,絕對(duì)隔離是不可能的。
來(lái)自信號(hào)線引入的干擾。與PLC控制系統(tǒng)連接的各類信號(hào)傳輸線,除了傳輸有效的各類信息之外,總會(huì)有外部干擾信號(hào)侵人。此于擾主要有兩種途徑:一是通過(guò)變送器供電電源或共用信號(hào)儀表的供電電源串人的電網(wǎng)干擾,往往被忽視;二是信號(hào)線受到空間電磁輻射感應(yīng)的干擾即信號(hào)線上的外部感應(yīng)干擾,這是很嚴(yán)重的。山信號(hào)引人干擾會(huì)引起UO信號(hào)工作異常和測(cè)量精度的大大降低,嚴(yán)重時(shí)會(huì)引起元器件損傷。對(duì)于隔離性能較差的系統(tǒng),還將導(dǎo)致信號(hào)間互相干擾,引起共地系統(tǒng)總線回流,造成邏輯數(shù)據(jù)變化、誤動(dòng)作和死機(jī)。
來(lái)自接地系統(tǒng)混亂時(shí)的干擾。接地是提高電子設(shè)備電磁兼容性的有效手段之一。正確的接地,既能抑制電磁千擾的影響,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)引起嚴(yán)重的干擾信號(hào),使系統(tǒng)無(wú)法正常工作。
來(lái)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及其對(duì)模擬電路的影響,模擬地與邏輯地的相4E92影響及元器件間的相互不匹配使用等。這都屬于PLC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,應(yīng)用部門無(wú)法改變,但要選擇具有較多應(yīng)用實(shí)績(jī)或紀(jì)呂丈考驗(yàn)的模塊。

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主營(yíng)DCS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 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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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。