3D04153G05優(yōu)勢(shì)來襲

3D04153G05優(yōu)勢(shì)來襲

3D04153G05優(yōu)勢(shì)來襲

控制處理能力的另一個(gè)指標(biāo)，運(yùn)算速度，在人們印象當(dāng)中PLC也比DCS要快很多。從某一個(gè)角度來看，情況也的確如此，PLC執(zhí)行邏輯運(yùn)算的效率很高，執(zhí)行1K邏輯程序不到1毫秒，其控制周期(以DI輸入直接送DO輸出為例)可以控制在50ms以內(nèi);而DCS在處理邏輯運(yùn)算和模擬運(yùn)算時(shí)采用相同的方式，其控制周期往往在100ms以上。我們用PID算法來比較時(shí)，可以發(fā)現(xiàn)PLC執(zhí)行一個(gè)PID運(yùn)算在幾個(gè)毫秒，而NETWORK6000+DCS的T2550控制器解算一個(gè)PID也需要1個(gè)毫秒，這說明PLC和DCS和實(shí)際運(yùn)算能力是相當(dāng)?shù)?某此型號(hào)的DCS控制器甚至更強(qiáng)。而控制周期上的差異主要與控制器的調(diào)度設(shè)計(jì)有關(guān)。大型PLC往往使用副CPU來完成模擬量的運(yùn)算，主CPU高速地完成開關(guān)量運(yùn)算，所以即使模擬運(yùn)算速度一般，在開關(guān)量控制方面的速度表現(xiàn)還是非常優(yōu)秀的。而DCS以同樣的速度來處理開關(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NETWORK6000+DCS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)，zui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。

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