DSSR122

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描述

DSSR122

PLC應(yīng)用主要問(wèn)題及解決辦法
  可編程控制器在本系統(tǒng)的任務(wù)是完成智能裝置的保護(hù)出口繼電器觸點(diǎn)或者遙控觸點(diǎn)的檢測(cè)和智能裝置的遙信開(kāi)入檢測(cè),具體到可編程控制器各模塊是開(kāi)入模塊負(fù)責(zé)檢測(cè)出口繼電器觸點(diǎn)導(dǎo)通和開(kāi)出模塊負(fù)責(zé)提供開(kāi)出完成智能裝置的遙信的檢測(cè)功能。同時(shí)為了交換信息的需要,可編程控制器必須配置相對(duì)應(yīng)的通訊模塊以滿足可編程控制器和上位機(jī)信息交換要求。
  在本系統(tǒng)設(shè)計(jì)時(shí),對(duì)開(kāi)入模塊的功能有具體的要求,這些要求是和電力系統(tǒng)的智能裝置實(shí)現(xiàn)的功能是密切相關(guān),如觸點(diǎn)類型和觸點(diǎn)的導(dǎo)通時(shí)間等,因此必須分析智能裝置的保護(hù)出口繼電器觸點(diǎn)和遙控觸點(diǎn)檢測(cè)的具體要求,并以此為要求進(jìn)行可編程控制的硬件選擇和內(nèi)部邏輯回路的設(shè)計(jì),充分滿足本系統(tǒng)對(duì)觸點(diǎn)檢測(cè)的特殊要求??删幊炭刂破鞯拈_(kāi)出模塊邏輯回路的設(shè)計(jì)也必須滿足本系統(tǒng)的特殊需要。
  3.1繼電器出口觸點(diǎn)檢測(cè)特殊要求
  可編程控制器開(kāi)入模塊負(fù)責(zé)檢測(cè)繼電保護(hù)出口繼電器輔助觸點(diǎn)的通斷情況,并將開(kāi)入模塊數(shù)據(jù)上送到控制計(jì)算機(jī),并作為控制計(jì)算機(jī)自動(dòng)檢測(cè)成功標(biāo)準(zhǔn)之一。
  因此可編程控制器開(kāi)入模塊檢測(cè)功能的強(qiáng)弱決定本系統(tǒng)的可靠性和穩(wěn)定性。
  繼電保護(hù)裝置的出口繼電器觸點(diǎn)包括四類:保持型常開(kāi)接點(diǎn)、保持型常閉節(jié)點(diǎn)、瞬動(dòng)型常開(kāi)接點(diǎn)和瞬動(dòng)型常閉節(jié)點(diǎn)。對(duì)于保持型出口觸點(diǎn)的檢測(cè)來(lái)說(shuō),可編程控制器的開(kāi)入是滿足自動(dòng)檢測(cè)的需要。而對(duì)于瞬動(dòng)型觸點(diǎn)的檢測(cè),可編程控制器開(kāi)入模塊檢測(cè)功能是否滿足要求取決于PLC本身掃描周期T1和瞬動(dòng)接通的時(shí)間T2兩者的關(guān)系。考慮到可編程控制器由于掃描方式引起開(kāi)入延時(shí)最長(zhǎng)可能達(dá)兩個(gè)掃描周期,如果保護(hù)裝置的瞬動(dòng)觸點(diǎn)的接通時(shí)間T2大于兩倍的掃描周期T1,該觸點(diǎn)的狀態(tài)變化就可以被PLC開(kāi)入模塊所檢測(cè)到。
  瞬動(dòng)觸點(diǎn)的接通時(shí)間取決兩個(gè)因素,一是裝置軟件內(nèi)部對(duì)瞬動(dòng)繼電器出口延時(shí)整定的時(shí)間,目前各廠家提供的技術(shù)參數(shù)來(lái)看,裝置軟件觸點(diǎn)延時(shí)的時(shí)間一般設(shè)置為50-100毫秒,二是出口繼電器本身動(dòng)作時(shí)間和斷開(kāi)時(shí)間參數(shù)也會(huì)影響瞬動(dòng)觸點(diǎn)的接通時(shí)間。假設(shè)瞬動(dòng)型觸點(diǎn)的接通時(shí)間為100毫秒,要求可編程控制器的掃描周期的時(shí)間小于50毫秒,才能保證可編程控制器的開(kāi)入模塊的檢測(cè)功能的有效性。
  可編程控制器的掃描周期和可編程控制器的硬件參數(shù)和用戶的程序的大小有密切的關(guān)系。因此只要通過(guò)硬件配置和相關(guān)技術(shù)手冊(cè)提供的技術(shù)參數(shù)并結(jié)合用戶的PLC程序指令類型和各指令類型數(shù)目計(jì)算出可編程控制器掃描周期,選擇合適可編程控制器模塊,保證可編程控制器掃描周期小于50毫秒,保護(hù)裝置的瞬動(dòng)型觸點(diǎn)檢測(cè)就可以在可編程控制器開(kāi)入模塊來(lái)完成。

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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(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。