AS-BDEP-218
I/A Series 系統(tǒng)的特點
系統(tǒng)可靠性和安全性:
整個網(wǎng)絡(luò)的開放結(jié)構(gòu)使得任何一臺處理機或工作站出現(xiàn)故障,都不會影響到其它工作站的操作功能。這是由網(wǎng)絡(luò)的拓撲結(jié)構(gòu)決定的。
節(jié)點總線與現(xiàn)場總線均采用冗余結(jié)構(gòu),提供完善的傳輸出錯檢測技術(shù),節(jié)點總線接口采用一個32位出錯檢測碼與來自各處理機的信息一同送出,在錯誤檢測方面提供重發(fā),增強系統(tǒng)安全和可靠性.I/A Series系統(tǒng)網(wǎng)絡(luò)對系統(tǒng)的訪問是基于可組態(tài)的口令保護環(huán)境,這些環(huán)境將所有用戶限制在他們工作所需的顯示畫面,應(yīng)用程序和組態(tài)程序的范圍內(nèi),而不提供可能引起誤操作的環(huán)境.
FBM(現(xiàn)場輸入/輸出模塊)可以由軟件設(shè)置為在通訊故障下的保持狀態(tài),即使上級控制處理機都已故障,或是雙冗余的通訊電纜都被切斷,甚至所有的上級控制和操作管理站都斷電,F(xiàn)BM采用了冗余電源供應(yīng),繼續(xù)保持輸出,直至系統(tǒng)重新恢復(fù)后,再由上級控制處理機接管控制。另外,如果發(fā)生整個系統(tǒng)的UPS電源和系統(tǒng)后備電源都被切斷的情況,I/A Series的電源系統(tǒng)中依然提供了電池后備電源,可以對所有FBM中的內(nèi)存繼續(xù)供電,只要系統(tǒng)電源一恢復(fù),F(xiàn)BM將按斷電之前的參數(shù)設(shè)置輸出值,以保證過程控制的連續(xù)。
FBM卡件裝有控制軟件可執(zhí)行順序控制、梯形邏輯控制、事故追憶的處理、數(shù)模轉(zhuǎn)換、輸入/輸出信號處理、智能現(xiàn)場信號(智能變送器、智能流量計等)的數(shù)據(jù)通信及處理?梢蕴岣攥F(xiàn)場控制速度、降低控制處理機負擔(dān)。每一模擬量輸入/輸出點都提供有源和無源輸入端子,在現(xiàn)場可自由選擇接入方式。
I/A Series系統(tǒng)采用先進的CMOS電子組件技術(shù),非金屬材料傳導(dǎo)冷卻。所有組件均采用表面安裝技術(shù)(SMT),尺寸小,電子組件全密封,**地將電子器件與污染環(huán)境相隔離,從而大大減少用戶的電能消耗,空調(diào)和空間的需求,保證硬件的高度可靠。全密封的特點在南方潮濕多雨的環(huán)境下更顯優(yōu)勢,卡件完全是免維護的。
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資訊來源:興潤星 何工
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