MS-NAE5510-2

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描述

MS-NAE5510-2

上位機(jī)數(shù)據(jù)采樣特殊要求的實(shí)現(xiàn)
  在前面小節(jié)中,討論了可編程控制器必須滿足檢測(cè)保護(hù)裝置的四類節(jié)點(diǎn)的檢測(cè)的基本條件。但前面條件的符合,只能保證PLC開入模塊能夠檢測(cè)保護(hù)裝置動(dòng)作觸點(diǎn)狀態(tài)的變化情況。在自動(dòng)測(cè)試系統(tǒng)設(shè)計(jì)中,可編程控制器的開入模塊僅僅采集觸點(diǎn)狀態(tài),而完成觸點(diǎn)狀態(tài)檢測(cè)標(biāo)準(zhǔn)判斷是在控制計(jì)算機(jī)中完成,如何保證上位機(jī)能夠得到完整、連續(xù)的基于采樣周期為50毫秒可編程控制器開入模塊采樣數(shù)據(jù)是本系統(tǒng)必須要解決的關(guān)鍵問題。
  電力系統(tǒng)智能裝置自動(dòng)測(cè)試系統(tǒng)檢測(cè)的對(duì)象是繼電保護(hù)設(shè)備中出口繼電器動(dòng)作情況,由于繼電保護(hù)設(shè)備的動(dòng)作的快速性,部分保護(hù)動(dòng)作時(shí)間實(shí)現(xiàn)小于50ms,因此部分出口繼電器觸點(diǎn)狀態(tài)在較短的時(shí)間會(huì)出現(xiàn)反轉(zhuǎn),根據(jù)系統(tǒng)設(shè)計(jì)要求,要求上位機(jī)能將保護(hù)動(dòng)作前和保護(hù)動(dòng)作后出口繼電器接點(diǎn)動(dòng)作情況進(jìn)行檢測(cè)處理,并將動(dòng)作前后出口繼電器接點(diǎn)狀態(tài)作為該系統(tǒng)中繼電器接點(diǎn)檢測(cè)判斷依據(jù)。因此,要通過上位機(jī)和可編程控制器通訊數(shù)據(jù)交換,實(shí)現(xiàn)采樣時(shí)間間隔不大于50ms可編程控制器開入采樣數(shù)據(jù)上送到上位機(jī)的目標(biāo)。
  目前,上位機(jī)獲得可編程控制器的開入采樣數(shù)據(jù)是通過通訊交換信息得到,而提高上位機(jī)和PLC數(shù)據(jù)信息交換效率是解決數(shù)據(jù)采樣的實(shí)時(shí)性的措施之一,但僅僅依靠提高上位機(jī)和PLC數(shù)據(jù)交換速度是無法到達(dá)采樣數(shù)據(jù)周期50ms指標(biāo)要求,即使上位機(jī)使用以太網(wǎng)介質(zhì)能達(dá)到此要求,也會(huì)占用上位機(jī)比較多資源。同時(shí)由于可編程控制器掃描工作方式的特點(diǎn),通訊模塊頻繁和上位機(jī)數(shù)據(jù)交換會(huì)影響可編程控制器其他模塊功能執(zhí)行,如影響可編程控制器掃描周期。
   對(duì)于可編程控制器來說,在其內(nèi)部實(shí)現(xiàn)50ms采樣周期的數(shù)據(jù)采樣是完全可以的實(shí)現(xiàn)的,充分利用可編程控制器中數(shù)據(jù)轉(zhuǎn)存和邏輯控制功能,將每50ms一次采樣數(shù)據(jù)寄存到連續(xù)但不相同數(shù)據(jù)緩沖區(qū)。通過采樣周期時(shí)間的整定,結(jié)合上位機(jī)和可編程控制器通訊協(xié)議的最大數(shù)據(jù)長度,上位機(jī)只需要在給定的時(shí)間內(nèi)進(jìn)行一次讀取多次采樣數(shù)據(jù)即可。上位機(jī)讀取采樣數(shù)據(jù)后,根據(jù)PLC采樣數(shù)據(jù)轉(zhuǎn)存的原則和邏輯,將已接收到采樣數(shù)據(jù)進(jìn)行采樣時(shí)序的還原即可。

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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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,福克斯波羅、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)起來也就簡單了。