IC693MDL632

IC693MDL632

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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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　根據(jù)被控對象的工藝流程、復(fù)雜程度和客戶的技術(shù)要求確定系統(tǒng)的規(guī)模，可以分為大、中、小三種規(guī)模。確保硬件資源有一定裕量而不浪費。

　　小規(guī)模控制系統(tǒng)適用于單機或小規(guī)模生產(chǎn)過程，以順序控制為主，信號多為開關(guān)量，且I/O點數(shù)較少（低于128點），精度和響應(yīng)時間要求不高。一般選用S7-200就可達到控制要求

　　中等規(guī)?？刂葡到y(tǒng)適用于復(fù)雜邏輯和閉環(huán)控制的生產(chǎn)過程，I/O點數(shù)較多（128點到512點之間），需要完成某些特殊功能，如PID控制等。一般選用S7-300等。

　　大規(guī)?？刂葡到y(tǒng)適用于大規(guī)模過程控制、DCS系統(tǒng)和工廠自動化網(wǎng)絡(luò)控制，I/O點數(shù)較多（高于512點），被控對象的工藝過程較復(fù)雜，對于精度和響應(yīng)時間要求較高。應(yīng)選用具有智能控制、高速通信、數(shù)據(jù)庫、函數(shù)運算等功能的高檔PLC，如S7-400等。

　　2）硬件配置

　　根據(jù)系統(tǒng)規(guī)模和客戶的技術(shù)對控制系統(tǒng)I/O點數(shù)進行估算。分析被控對象工藝過程，統(tǒng)計系統(tǒng)I/O點數(shù)和I/O類型。按照設(shè)備和生產(chǎn)區(qū)域的不同進行劃分，明確各個I/O點的位置和功能。再加上10%～20%的備用量列出詳細的I/O點清單。

　　3）軟件配置

　　根據(jù)控制系統(tǒng)設(shè)計要求選擇適合的軟件，包括系統(tǒng)平臺軟件、編程軟件。

　　上位機監(jiān)控軟件的選擇。首先需考慮監(jiān)控的點數(shù)限制；是否有報警顯示、趨勢分析、報表打印以及歷史記錄功能。

　　4）控制功能

　　要正確的進行控制系統(tǒng)的規(guī)模選擇，首先要了解各家控制器的特性，比如性能參數(shù)、應(yīng)用場合、行業(yè)解決方案，以及可靠性和通用性等。如何選擇一個控制系統(tǒng)，一般遵循以下幾點：

　　控制系統(tǒng)是否需要冗余、I/O信號模塊是否需要冗余、通訊是否需要冗余。

　　控制點數(shù)有多少，包括數(shù)字量輸入和輸出點數(shù)、模擬量輸入和輸出點數(shù)。

　　被控對象工藝是否復(fù)雜，是否需要實現(xiàn)特殊功能，比如防喘控制等。

　　系統(tǒng)正常運行時，控制器的負載率是否有足夠的工作裕量；I/O信號點是否需要一定的余量。

　　針對數(shù)字信號，是否需要繼電器隔離；考慮輸入信號的電壓和電流等級；輸出信號是否需要固態(tài)繼電器輸出。

　　針對模擬量信號，是否需要安全隔離柵；信號的類型，電壓型還是電流型；電壓和電流的測量范圍。不一樣的信號類型，需要選擇不一樣的I/O信號模塊。

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