機(jī)械安全是一項(xiàng)復(fù)雜的系統(tǒng)工程,需要考慮的因素很多,比如機(jī)械設(shè)備特點(diǎn)、工藝操作特點(diǎn)、安全設(shè)計(jì)理念等等。一般來(lái)說(shuō),安全控制系統(tǒng)應(yīng)該包括安全輸入設(shè)備(如急停按鈕、安全門限位開(kāi)關(guān)或聯(lián)鎖開(kāi)關(guān)、安全光柵或光幕、雙手控制按鈕),安全控制電氣元件(如安全繼電器、安全PLC和安全總線)和安全輸出控制(如主回路中的接觸器、繼電器或閥等)。其中,安全PLC是在應(yīng)用中值得重點(diǎn)關(guān)注的產(chǎn)品。所謂安全PLC,就是專門為條件苛刻的任務(wù)或安全相關(guān)的應(yīng)用而設(shè)計(jì)的PLC,在其失效時(shí)不會(huì)對(duì)人員安全或過(guò)程安全帶來(lái)危險(xiǎn)。在一臺(tái)安全PLC根據(jù)要求達(dá)到了特定的可靠性/故障概率等級(jí)時(shí),就意味著它具有廣泛的自診斷能力,可以監(jiān)測(cè)各個(gè)方面的硬件狀態(tài)、程序執(zhí)行狀態(tài)和操作系統(tǒng)狀態(tài)。此外,安全PLC還必須能夠執(zhí)行標(biāo)準(zhǔn)機(jī)構(gòu)(例如TUV、FM等)認(rèn)證的必須的故障安全動(dòng)作,而這些故障安全動(dòng)作都是根據(jù)特定的原則設(shè)計(jì),并滿足國(guó)際安全標(biāo)準(zhǔn)(如IEC61508和EN954-1等)中定義的要求。另外,安全PLC還可能包括警衛(wèi)保護(hù)預(yù)警和權(quán)限管理的內(nèi)容,用來(lái)保護(hù)安全PLC不受來(lái)自外界的干擾。
聯(lián)系人:黃曉飛(銷售工程師)
移動(dòng)電話:18030263579
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