22F-D4P2N103/A
22F-D4P2N103/A
22F-D4P2N103/A
《聯(lián)系人;歐先生》
由于近年西門子全集成自動(dòng)化(TIA)理念在西門子系統(tǒng)中的推廣和應(yīng)用,西門子SIMATIC系統(tǒng)尤其PCS 7系統(tǒng)中增添了許多可供用戶選擇的豐富的安全防爆系統(tǒng)解決方案,大大加強(qiáng)了其在安全防爆領(lǐng)域的應(yīng)用能力。而且由于本質(zhì)安全型現(xiàn)場(chǎng)總線PROFIBUS-PA的推廣應(yīng)用,日臻成熟,為解決傳統(tǒng)的安全防爆系統(tǒng)設(shè)計(jì)提供了更靈活、可靠的解決方案。本文主要介紹以西門子SIMATIC系統(tǒng)為核心構(gòu)架完成一個(gè)安全防爆系統(tǒng)的幾種典型解決方案。
(1)從點(diǎn)對(duì)點(diǎn)接線到點(diǎn)對(duì)點(diǎn)接線(Point to Point)解決方案
傳統(tǒng)DCS/PLC+安全柵方案,見圖1所示。這類本安防爆接口以隔離式和齊納式安全柵為代表。應(yīng)用特點(diǎn)是本安防爆現(xiàn)場(chǎng)儀表以點(diǎn)對(duì)點(diǎn)的接線方式通過電纜接至安全區(qū)控制柜內(nèi)的安全柵,安全柵再以點(diǎn)對(duì)點(diǎn)的接線方式接至控制系統(tǒng)(DCS/PLC)的通用I/O卡。這是傳統(tǒng)的本安防爆接口技術(shù)。
(2)本安防爆I/O卡板解決方案
本安防爆I/O卡板解決方案是在DCS/PLC的通用I/O卡板基礎(chǔ)上增加本安電路,使之成為本安防爆卡板,可直接與現(xiàn)場(chǎng)兩線制本安儀表相連接,省卻安全柵環(huán)節(jié),構(gòu)成本安防爆控制系統(tǒng),見圖2所示。其本質(zhì)與DCS/PLC+安全柵方案相同,但是減少了安全柵環(huán)節(jié),節(jié)省了線路連接點(diǎn),因此能夠降低系統(tǒng)的故障點(diǎn)。而且這類本安模塊如SIMATIC S7-300系列的本安防爆式Ex I/O卡板SM322,SM321,SM331,SM332等,其防爆等級(jí)為Ex-ibIIC,可以掛接Ex.Zone1區(qū)內(nèi)的本安儀表。由于本安防爆卡板使用了集成安全柵技術(shù),減少了隔離式和齊納式安全柵的使用,因此結(jié)構(gòu)緊湊,節(jié)約了空間和費(fèi)用。
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