3D04153G05優勢來襲

3D04153G05優勢來襲

3D04153G05優勢來襲

控制處理能力的另一個指標，運算速度，在人們印象當中PLC也比DCS要快很多。從某一個角度來看，情況也的確如此，PLC執行邏輯運算的效率很高，執行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;而DCS在處理邏輯運算和模擬運算時采用相同的方式，其控制周期往往在100ms以上。我們用PID算法來比較時，可以發現PLC執行一個PID運算在幾個毫秒，而NETWORK6000+DCS的T2550控制器解算一個PID也需要1個毫秒，這說明PLC和DCS和實際運算能力是相當的,某此型號的DCS控制器甚至更強。而控制周期上的差異主要與控制器的調度設計有關。大型PLC往往使用副CPU來完成模擬量的運算，主CPU高速地完成開關量運算，所以即使模擬運算速度一般，在開關量控制方面的速度表現還是非常優秀的。而DCS以同樣的速度來處理開關量和模擬量運算，控制周期的指標確實不理想。新型的DCS控制器學習了大型PLC的設計，在控制周期方面的表現獲得了大幅度的提高。以NETWORK6000+DCS的T2550控制器為例。控制器可以設置四個不同優先級的任務，zui小運算周期可以設為10ms，配合高速I/O卡件，控制周期能夠達到15~20ms。而模擬量運算設置在其它周期較長的任務中。

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