1C31107G01模擬量輸入輸出模塊在當(dāng)前的自動(dòng)化應(yīng)用里,對(duì)自動(dòng)化控制系統(tǒng)已經(jīng)提出了更高的要求,下表列出了這些要求帶來(lái)的變化。雖然PLC業(yè)界已經(jīng)注意到了這一趨勢(shì),并通過(guò)將PC技術(shù)應(yīng)用于PLC產(chǎn)品,直接提供OPC Server、WEB Server及IEEE標(biāo)準(zhǔn)通訊接口等,以提供更高的應(yīng)用靈活性。但是受限于傳統(tǒng)PLC專屬式的設(shè)計(jì),其互操作性和靈活性很差(即使是對(duì)于同一品牌的PLC來(lái)說(shuō),也是這樣),并不能完全滿足用戶的要求:
1C31107G01模擬量輸入輸出模塊傳統(tǒng)的PLC均不能提供主動(dòng)的事件通知,系統(tǒng)的集中監(jiān)視管理有賴于服務(wù)器主機(jī)的主動(dòng)定時(shí)查詢;因?yàn)樵趯?shí)時(shí)信息上的欠缺,要實(shí)現(xiàn)跨PLC的事件處理比較困難,且速度延遲,效果不佳;
無(wú)法提供本地直接處理的預(yù)約控制,預(yù)約控制完全有賴于服務(wù)器主機(jī)的集中處理,所以系統(tǒng)當(dāng)機(jī)時(shí),立刻停擺;
系統(tǒng)的建構(gòu)由于采用了不同供應(yīng)商的多種平臺(tái),為整合各種不同的專用總線,系統(tǒng)之銜接有賴于第三方提供的OPC Server或Gateway,故其實(shí)施并不是一件輕松和容易的事情;
系統(tǒng)升級(jí)將必須付出重新設(shè)計(jì)的成本和時(shí)間,其不可預(yù)見(jiàn)成本太高。
梯形圖程序的設(shè)計(jì)是基于個(gè)案進(jìn)行,每一專案均無(wú)法完全復(fù)制應(yīng)用,無(wú)法實(shí)現(xiàn)標(biāo)準(zhǔn)化,從而工程設(shè)計(jì)費(fèi)用無(wú)法降低;
現(xiàn)行自動(dòng)化系統(tǒng)的數(shù)據(jù)容量太小,在適應(yīng)新的應(yīng)用需求時(shí)顯得力不從心;
無(wú)法實(shí)現(xiàn)實(shí)時(shí)同步遠(yuǎn)程的數(shù)據(jù)傳輸,與PDA、手機(jī)的連接比較困難;
需要通過(guò)PC或第三方設(shè)備來(lái)實(shí)現(xiàn)基于WEB的遠(yuǎn)程數(shù)據(jù)發(fā)布。
什么是PAC
雖然從外形上來(lái)看,PAC與傳統(tǒng)的PLC非常相似,但究其實(shí)質(zhì),PAC系統(tǒng)的性能卻廣泛得多。作為一種多功能的控制平臺(tái),用戶可以根據(jù)系統(tǒng)的需要,組合和搭配相關(guān)的技術(shù)和產(chǎn)品以實(shí)現(xiàn)功能的側(cè)重,因?yàn)榛谕话l(fā)展平臺(tái)進(jìn)行開發(fā),所以采用PAC系統(tǒng)保證了控制系統(tǒng)各功能模塊具有統(tǒng)一性,而不僅是一個(gè)完全無(wú)關(guān)的部件拼湊成的集合體。
綜合業(yè)界專家的意見(jiàn),所謂PAC系統(tǒng)應(yīng)該具備以下一些主要的特征和性能:
提供通用發(fā)展平臺(tái)和單一數(shù)據(jù)庫(kù),以滿足多領(lǐng)域自動(dòng)化系統(tǒng)設(shè)計(jì)和集成的需求
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