IC693MDL633

IC693MDL633

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〖廈門光沃自動化設(shè)備有限公司 竭誠為您服務(wù)〗   
〖：歐工         〗
〖(同號)       〗
〖:  2479261344     〗
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【價格】如此低價,* 
【貨期】大量現(xiàn)貨,下單后即可發(fā)貨
【質(zhì)量】*,進口***
【保障】產(chǎn)品經(jīng)過專業(yè)檢測，質(zhì)保一年,15天包退換
【品牌】Allen-Bradley羅克韋爾、ABB、本特利Bently 3500系統(tǒng)卡件、GE、艾默生西屋等模塊卡件
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用于溫度測量的信號模塊，考慮是熱電阻還是熱電偶。

　　信號模塊是否需要在線帶電插拔更換。如果需要，還需考慮附加特殊的背板插槽。

　　當系統(tǒng)和外部出現(xiàn)故障時，比如信號短路或鍛爐，這時信號模塊是否需要將輸入輸出信號自動切換到預(yù)先設(shè)置的安全值。如有要求，需考慮選用故障安全型的控制器和信號模塊。

　　當需要和第三方設(shè)備通訊時，需考慮通訊距離的長短，以及相應(yīng)的通訊接口協(xié)議等，選用不同的通訊模塊。

　　針對系統(tǒng)中的重要連鎖信號，是否需要特殊的SOE模塊，來記錄信號變化的時間先后順序。

　　熟悉被控對象是設(shè)計控制系統(tǒng)的基礎(chǔ)。只有深入了解被控對象以及被控過程，才能夠提出合理科學的控制方案。

　　1）分析被控對象。詳細分析被控對象的工藝流程，了解其工作特性。此階段一定要與用戶進行深入的溝通，確保分析得全面而準確。

　　2）畫出工藝流程圖。經(jīng)過*步，應(yīng)對被控對象的整個工藝流程有了深入的了解，為了更直觀、簡潔的表示，畫出工藝流程圖，為后面的系統(tǒng)設(shè)計做準備。

　　3）分析并明確控制任務(wù)。根據(jù)已經(jīng)做好的工藝流程圖，工程師可以把用戶提出的控制要求轉(zhuǎn)換為專業(yè)術(shù)語，對其逐一進行分解，并從控制的角度將其中的要求轉(zhuǎn)化為多個控制回路。對于過程控制系統(tǒng)可用PID圖來表示其中的控制關(guān)系。

　　PLC控制系統(tǒng)總體設(shè)計

　　在控制系統(tǒng)設(shè)計之前，需要對系統(tǒng)的方案進行論證。主要是對整個系統(tǒng)的可行性作一個預(yù)測性的估計。在此階段一定要全面地考慮到設(shè)計和實施此系統(tǒng)將會遇到的各種問題。如果沒有做過相關(guān)項目的經(jīng)驗，應(yīng)當在實地仔細考察，并詳細地論證設(shè)計此系統(tǒng)中的每一個步驟的可行性。特別是在硬件實施階段中，稍有不慎，就會造成很大的麻煩，輕則系統(tǒng)不成功，重則會造成嚴重的人員和財產(chǎn)的損失。工程實施的過程中的阻礙，往往都是由于這一步?jīng)]有做足工夫而導致的。

　　系統(tǒng)的總體設(shè)計關(guān)系到整個系統(tǒng)的總體構(gòu)架，每個細節(jié)都必須經(jīng)過反復斟酌。首先要能夠滿足用戶提出的基本要求；其次是確保系統(tǒng)的可靠性，不可以經(jīng)常出現(xiàn)故障，就算出現(xiàn)故障也不會造成大的損失；然后在經(jīng)濟性等方面予以考慮。

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