IC693CMM321而DCS以同樣的速度來(lái)處理開(kāi)關(guān)量和模擬量運(yùn)算,控制周期的指標(biāo)確實(shí)不理想。新型的DCS控制器學(xué)習(xí)了大型PLC的設(shè)計(jì),在控制周期方面的表現(xiàn)獲得了大幅度的提高。以NT6000DCS的T2550控制器為例。控制器可以設(shè)置四個(gè)不同優(yōu)先級(jí)的任務(wù),最小運(yùn)算周期可以設(shè)為10ms,配合高速I/O卡件,控制周期能夠達(dá)到15~20ms。而模擬量運(yùn)算設(shè)置在其它周期較長(zhǎng)的任務(wù)中。
2.2 數(shù)據(jù)通訊交換數(shù)據(jù)通訊交換主要是指控制系統(tǒng)網(wǎng)絡(luò)及其數(shù)據(jù)交換形式。在這個(gè)方面DCS有著先天的優(yōu)勢(shì)。集散系統(tǒng)的“分散”主要體現(xiàn)在獨(dú)立的控制器上,“集中”主要體現(xiàn)在具有完整數(shù)據(jù)的人機(jī)交互裝置上,而將分散和集中連接成集散系統(tǒng)的正是網(wǎng)絡(luò)。因此,從DCS發(fā)展的早期,網(wǎng)絡(luò)就成為了DCS生產(chǎn)廠家的核心技術(shù)方向,冗余技術(shù)、窄帶傳輸技術(shù)都是DCS廠家最早研發(fā)或應(yīng)用成功的。PLC主要是按照獨(dú)立裝置來(lái)設(shè)計(jì)的,其“網(wǎng)絡(luò)”實(shí)際上是串行通訊。
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