ERA180

分類：
選擇深圳長(zhǎng)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

ERA180

隨著電廠自動(dòng)化水平的進(jìn)一步提高，DCS系統(tǒng)在整個(gè)生產(chǎn)過程系統(tǒng)中越來越發(fā)揮關(guān)鍵作用，因此對(duì)其穩(wěn)定性和可靠性的要求越來越高，現(xiàn)在對(duì)整個(gè)DCS系統(tǒng)的可靠性已經(jīng)要求達(dá)到99．9％以上，而通訊系統(tǒng)作為DCS系統(tǒng)的關(guān)鍵子系統(tǒng)，其可靠性和實(shí)時(shí)性直接影響整個(gè)DCS系統(tǒng)。因此，為了有效提高DCS通訊系統(tǒng)的可靠性，DCS廠商常常采用了以下措施：
　　1）冗余配置?，F(xiàn)在所有電廠DCS系統(tǒng)骨干通訊網(wǎng)絡(luò)一般都采取了冗余配置，有些還實(shí)現(xiàn)了多重冗余，這樣通訊網(wǎng)絡(luò)可以保持高可用性。
　　2）使用光纖作為傳輸媒介。眾所周知，光纖不僅具有傳輸距離遠(yuǎn)、通訊帶寬大和耐腐蝕等顯著優(yōu)點(diǎn)，而且還具有抗電磁干擾能力強(qiáng)和傳輸誤碼率低等突出優(yōu)勢(shì)，而這些是銅纜和雙絞線等常規(guī)傳輸媒介所無法比擬的，因此近年來在通訊系統(tǒng)、自動(dòng)化系統(tǒng)的骨干通訊網(wǎng)絡(luò)中逐漸得到了廣泛使用?？梢灶A(yù)言，隨著光纖產(chǎn)品價(jià)格的進(jìn)一步下降和DCS系統(tǒng)物理分散發(fā)展需要，光纖的使用將繼續(xù)擴(kuò)大。
　　3）網(wǎng)絡(luò)的解藕配置。該措施不僅有效隔離了各層數(shù)據(jù)流量，提高通訊實(shí)時(shí)性，而且也
　　隔離通訊故障，將故障的影響盡可能地限制在最小范圍內(nèi)，從而提高整個(gè)通訊系統(tǒng)的可靠性。
　　4）網(wǎng)絡(luò)故障下的自動(dòng)無擾切換。所有DCS通訊系統(tǒng)都具有在線監(jiān)測(cè)功能，一旦工作通訊網(wǎng)絡(luò)發(fā)生故障，系統(tǒng)將自動(dòng)切換到處于熱備狀態(tài)的冗余網(wǎng)絡(luò)上，保證整個(gè)系統(tǒng)的連續(xù)無擾運(yùn)行，在有些系統(tǒng)中，冗余網(wǎng)絡(luò)之間周期性地切換，以防止熱備網(wǎng)絡(luò)出現(xiàn)錯(cuò)誤時(shí)未被及時(shí)發(fā)現(xiàn)，從而失去熱備作用。
　　5）數(shù)據(jù)完整性校驗(yàn)和自動(dòng)重發(fā)功能。在大多數(shù)系統(tǒng)中，在所有數(shù)據(jù)報(bào)文的發(fā)送前和接收后都進(jìn)行數(shù)據(jù)完整性（如CRC方式），一旦發(fā)生錯(cuò)誤，將自動(dòng)引發(fā)數(shù)據(jù)重發(fā)功能。

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，西門子，摩托羅拉，安川。力士樂。ACSO，橫河等進(jìn)口品牌。 專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊
Triconex?Siemens?Yaskawa?ABB?GE?Ovation?AB?Foxboro?Motorola?Schneider?XYCOM?KUKA ? 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)力庫存商家

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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)力庫存商家


選擇深圳長(zhǎng)欣，選擇放心，售后無憂大量現(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，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(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)起來也就簡(jiǎn)單了。

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