目前很多現(xiàn)代化的工業(yè)應(yīng)用需要更多的功能要求,如網(wǎng)絡(luò)連接、設(shè)備互用、企業(yè)數(shù)據(jù)集成等,這些都遠(yuǎn)遠(yuǎn)超過(guò)了傳統(tǒng)的、基于離散邏輯控制的PLC所能提供的功能,想要基于PLC的系統(tǒng)實(shí)現(xiàn)這些功能,必須用單獨(dú)的處理器、網(wǎng)關(guān)獲轉(zhuǎn)換器,運(yùn)行于獨(dú)立的PC軟件中間件以及企業(yè)系統(tǒng)級(jí)的專用軟件進(jìn)行系統(tǒng)集成。
PC-Based在自動(dòng)化應(yīng)用初期被PLC陣營(yíng)高度質(zhì)疑,至今市場(chǎng)上仍有相關(guān)疑慮,主要問(wèn)題有穩(wěn)定性、可靠性和程式設(shè)計(jì)環(huán)境不穩(wěn)定三點(diǎn),因此也有工程師將PLC配合PC使用,不過(guò)這在系統(tǒng)整合上比較麻煩。
為了解決PLC和PC-Based的整合問(wèn)題,美國(guó)研究機(jī)構(gòu)ARC提出了PAC架構(gòu)的控制器(可編程自動(dòng)化控制器),PAC融合了PLC和PC-Based兩種技術(shù),在PC層面,會(huì)大量應(yīng)用嵌入式技術(shù),擁有使用軟體來(lái)定義硬體的能力就是其一。
擁護(hù)者認(rèn)為,PAC的價(jià)值在于所有部件均按照軟件和硬件集成靈活、方便、成本為出發(fā)點(diǎn),從而使得用戶設(shè)備的生命周期成本較低,資產(chǎn)的投資回報(bào)率提高,資產(chǎn)所有者總成本下降。
當(dāng)然,也有觀點(diǎn)認(rèn)為,PAC仍屬于PC-Based產(chǎn)品,只是換了另外一種包裝。但就市場(chǎng)整體面來(lái)看,PAC的確已經(jīng)逐漸成形,包括西門(mén)子在內(nèi)的大廠,均已紛紛推出產(chǎn)品,國(guó)內(nèi)像研華也推出了全新一代的PAC控制器APAX-5000系列。
近年來(lái),中國(guó)電子制造設(shè)備行業(yè)走過(guò)了一條從國(guó)外引進(jìn)到消化吸收,以及再創(chuàng)新的曲折之路。對(duì)電子制造設(shè)備生產(chǎn)商而言,盡管設(shè)備種類繁多,但設(shè)計(jì)和制造符合越來(lái)越高端的模塊化、網(wǎng)絡(luò)化和數(shù)字化的電子設(shè)備產(chǎn)品,追求更高的加工檢測(cè)效率和更加智能的生產(chǎn)線,一直是這一行業(yè)矢志不渝的愿景目標(biāo)。
其中,PLC(可編程邏輯控制器)作為基礎(chǔ)的設(shè)備自動(dòng)化控制核心技術(shù)之一,隨著自身技術(shù)的快速發(fā)展,勢(shì)必將在越來(lái)越多的電子制造設(shè)備中,到整個(gè)電子自動(dòng)化產(chǎn)線/裝配線上,乃至全廠的自動(dòng)化系統(tǒng)方面發(fā)揮極其關(guān)鍵的作用,也終將幫助電子制造設(shè)備制造商的工業(yè)4.0目標(biāo)邁進(jìn)一大步。
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