描述

1756-L72S

?西門子（SIMATIC）PLC以其精湛的德國電路板制造工藝，在我國很過行業(yè)被廣泛應用，西門子故障處理、PCL電路板維修因而成為很多企業(yè)設備維護技術人員必須掌握的本領。

? ? 本文主要以西門子S5系列PLC為例分析西門子PLC的主要主要故障表現(xiàn)以及處理辦法。

? ? S5系列PLC目前在我國工業(yè)市場常見的主要有U型（通用型）、W型（字處理型）、R型（開關型）等三種型號。不同型號的PLC，其故障表現(xiàn)和判斷方式也不同。這其中，軟件故障都可以利用西門子專用編程器解決問題，西門子PLC都留有通訊PC接口，通過專用伺服編程器即可以解決幾乎所有的軟件問題。

? ? 通過軟件PC程序可以判斷是否是軟件故障，如果是硬件故障，則需要專用的芯片級電路板維修工程師才可對其進行修復工作，PLC一般都是模塊話結構構成，較為簡單的處理方式就是更換故障板卡。而上海彩亞電路板維修有限公司獨有的西門子在線檢測平臺則可以對所有模塊結構進行檢測，然后對故障部位進行芯片級維修處理，從而節(jié)約客戶成本超過70%以上。? S5PLC具有自診斷能力，發(fā)生模塊功能錯誤時往往能報警并按預先程序作出反應，通過故障指示燈就可判斷。當電源正常，各指示燈也指示正常，特別是輸入信號正常，但系統(tǒng)功能不正常（輸出無或亂）時，本著先易后難、先軟后硬的檢修原則首先檢查用戶程序是否出現(xiàn)問題。S5的用戶程序儲存在PLC的RAM中，是掉電易失性的，當后備電池故障系統(tǒng)電源發(fā)生閃失時，程序丟失或紊亂的可能性就很大，當然強烈的電磁干擾也會引起程序出錯。有EPROM存儲卡及插槽的PLC恢復程序就相當簡單，將EPROM卡上的程序拷回PLC后一般都能解決問題；沒有EPROM子卡的用戶就要利用PG的聯(lián)機功能將正確的程序發(fā)送到PLC上。需要特別說明的是，有時簡單的程序覆蓋不能解決問題，這時在重新拷貝程序前總清一下RAM中的用戶程序是相當必要的。通過將PLC上的“RUN”“ST”開關按RUN—ST—RUN—ST—RUN的順序撥打一遍或在PG上執(zhí)行“Object—Blocks—delet—inPLC—allblocks—overall—Reset”功能就完成了RAM中程序的總清。另外，保存在EPROM中的程序并不是萬無一失的，過分相信EPROM上的程序有時會給檢修帶來困惑。所以經(jīng)常性的檢查核對EPROM中的程序，特別是PG中的備份程序就顯的尤為重要。

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保?證?安全準時發(fā)貨，
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優(yōu)勢價格，大量現(xiàn)貨。

主營DCS系統(tǒng)配件
機器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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專業(yè)銷售進口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)實力庫存商家

1756-L72S

描述

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