MVP-020-3DC

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描述

MVP-020-3DC

硬件濾波及軟件抗干擾措施
? ? 信號(hào)在接入機(jī)柜前，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，要根本消除干擾影響是不可能的，因此在控制系統(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。
? ? 6、正確選擇接地點(diǎn)，完善接地系統(tǒng)
? ? 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：浮空方式、直接接地方式和電容接地三種方式。對(duì)DCS/PLC控制系統(tǒng)而言，它屬低電平控制裝置，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，所以系統(tǒng)接地線采用一點(diǎn)接地和串聯(lián)一點(diǎn)接地方式。（http://www.diangon.com/版權(quán)所有）集中布置的控制系統(tǒng)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，而且控制系統(tǒng)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)在控制系統(tǒng)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
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15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國內(nèi)實(shí)力庫存商家


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。

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