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)級的專用軟件進(jìn)行系統(tǒng)集成。
PC-Based在自動化應(yīng)用初期被PLC陣營高度質(zhì)疑，至今市場上仍有相關(guān)疑慮，主要問題有穩(wěn)定性、可靠性和程式設(shè)計環(huán)境不穩(wěn)定三點(diǎn)，因此也有工程師將PLC配合PC使用，不過這在系統(tǒng)整合上比較麻煩。
為了解決PLC和PC-Based的整合問題，美國研究機(jī)構(gòu)ARC提出了PAC架構(gòu)的控制器（可編程自動化控制器），PAC融合了PLC和PC-Based兩種技術(shù)，在PC層面，會大量應(yīng)用嵌入式技術(shù)，擁有使用軟體來定義硬體的能力就是其一。
擁護(hù)者認(rèn)為，PAC的價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。但就市場整體面來看，PAC的確已經(jīng)逐漸成形，包括西門子在內(nèi)的大廠，均已紛紛推出產(chǎn)品，國內(nèi)像研華也推出了全新一代的PAC控制器APAX-5000系列。
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