產(chǎn)品參數(shù):BENTLY 72750-03-01-15-00-01-1
一、安全表面系統(tǒng)的選型
安全表面系統(tǒng)的選擇應(yīng)當(dāng)契合世界電工委員會(huì) (IEC)2000年發(fā)布的IEC 61508《電氣/電子/可編程電子安全有關(guān)系統(tǒng)的功用安全》標(biāo)準(zhǔn),并經(jīng)TUV認(rèn)證。作為衡量電氣/電子/可編程電子設(shè)備(E/E/PE)功用安全的標(biāo)尺,IEC 61508標(biāo)準(zhǔn)的發(fā)布,為風(fēng)險(xiǎn)工業(yè)、安全表面系統(tǒng)用戶、系統(tǒng)集成商和設(shè)備供貨商供給了一個(gè)一同的、為各方所接受的標(biāo)準(zhǔn)標(biāo)準(zhǔn)。選擇經(jīng)過(guò)TUV認(rèn)證且契合IEC 61508標(biāo)準(zhǔn)的系統(tǒng),用戶將不需要依托長(zhǎng)時(shí)間的實(shí)習(xí)經(jīng)歷或進(jìn)行檢驗(yàn)就能獲得所選系統(tǒng)在安全可靠性、有效性、可維護(hù)和管理性上的嚴(yán)峻保證。
1.1 SIS與DCS的首要區(qū)別
按照IEC 61508和IEC 61511標(biāo)準(zhǔn),安全表面系統(tǒng)和DCS系統(tǒng)是兩種不一樣品種的系統(tǒng),但兩者互為補(bǔ)充和聯(lián)絡(luò),首要區(qū)別如下。
①計(jì)劃標(biāo)準(zhǔn)標(biāo)準(zhǔn)不一樣
安全表面系統(tǒng)產(chǎn)品是按照IEC 61508標(biāo)準(zhǔn)計(jì)劃、出產(chǎn)制造的,產(chǎn)品使用也要遵照IEC 61511提出的懇求,有著一同的世界(國(guó)內(nèi))標(biāo)準(zhǔn)標(biāo)準(zhǔn),并為制造商、用戶各方所接受。DCS系統(tǒng)只需要到達(dá)運(yùn)用國(guó)家及區(qū)域的標(biāo)準(zhǔn)標(biāo)準(zhǔn)懇求、滿足用戶提出的懇求即可。用戶在選擇和歸納評(píng)估不一樣制造商的DCS系統(tǒng)時(shí),更多考慮的是依據(jù)市場(chǎng)調(diào)查得到的其他用戶的運(yùn)用經(jīng)歷和供貨商供給的資料數(shù)據(jù)。
②產(chǎn)品定位不一樣
安全表面系統(tǒng)用于出產(chǎn)進(jìn)程中的安全防護(hù),功用安滿是其基地定位,懇求具有較高的可靠性和可用性。DCS系統(tǒng)則是用于出產(chǎn)中的進(jìn)程控制,控制功用是其基地定位,懇求滿足和完畢出產(chǎn)進(jìn)程中需要的各種控制功用,并經(jīng)過(guò)各項(xiàng)出產(chǎn)方針的優(yōu)化控制,完畢出產(chǎn)設(shè)備的節(jié)能降耗和增效。
③工作特性不一樣
DCS系統(tǒng)是一個(gè)“動(dòng)態(tài)”的進(jìn)程控制系統(tǒng),它實(shí)時(shí)搜集現(xiàn)場(chǎng)很多的各種技術(shù)數(shù)據(jù),依據(jù)預(yù)定的控制戰(zhàn)略進(jìn)行運(yùn)算(一般較為凌亂耗時(shí))處理后控制現(xiàn)場(chǎng)施行元件(調(diào)節(jié)閥)的動(dòng)作。這個(gè)進(jìn)程常常伴有操作人員的人工干與,照料處理速度一般在幾百毫秒到一秒之間。安全表面系統(tǒng)可以看作是一個(gè)“靜態(tài)”的系統(tǒng),正常工況下,它是“連續(xù)”的,不會(huì)宣告控制輸出指令,一旦到達(dá)或逾越臨界點(diǎn),則靈敏照料進(jìn)行邏輯運(yùn)算(一般較為簡(jiǎn)略)處理后控制施行元件(電磁閥、兩位式快動(dòng)閥等)的動(dòng)作,使設(shè)備處于所需的安全狀況。這個(gè)進(jìn)程一般沒(méi)有人工操作干與,照料處理速度一般在幾十到幾百毫秒,優(yōu)于DCS系統(tǒng)。
④產(chǎn)品認(rèn)證不一樣
安全表面系統(tǒng)(或該系統(tǒng)中的子系統(tǒng)及部件)需要經(jīng)過(guò)獨(dú)立公認(rèn)的第三方聲威安全組織的嚴(yán)峻認(rèn)證,如在世界范圍內(nèi)被認(rèn)可的德國(guó)TUV認(rèn)證。DCS系統(tǒng)則可以不需要經(jīng)過(guò)這種認(rèn)證,只需獲得通用的認(rèn)證即可,如UL、CE等。因而,在SIS選型時(shí),要特別注意SIS與DCS的區(qū)別,不能按DCS的選型思路來(lái)選擇安全表面系統(tǒng),且需要要害重視SIS全系統(tǒng)的安全性、可用性與可靠性。
1.2安全完整性等級(jí)的判定
安全完整性等級(jí)SIL(safety integrity level)是指在必定時(shí)間、必定條件下,安全有關(guān)系統(tǒng)施行其所規(guī)矩的安全功用的可能性。選擇安全表面系統(tǒng)時(shí),需要判定安全表面系統(tǒng)的安全完整性等級(jí)。安全完整性等級(jí)是對(duì)安全表面系統(tǒng)安全功用的懇求等級(jí),一個(gè)設(shè)備的風(fēng)險(xiǎn)性越高,對(duì)安全表面系統(tǒng)懇求的安全等級(jí)就越高,獲得對(duì)應(yīng)等級(jí)安全功用所支付的安全本錢也越高。
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