从某一个角度来看,情况也的确如此,PLC执行逻辑运算的效率很高,执行1K逻辑程序不到1毫秒,其控制周期(以DI输入直接送DO输出为例)可以控制在50ms以内;而DCS在处理逻辑运算和模拟运算时采用相同的方式,其控制周期往往在100ms以上。我们用PID算法来比较时,可以发现PLC执行一个PID运算在几个毫秒,而NT6000DCS的T2550控制器解算一个PID也需要1个毫秒,这说明PLC和DCS和实际运算能力是相当的,某此型号的DCS控制器甚至更强。而控制周期上的差异主要与控制器的调度设计有关。大型PLC往往使用副CPU来完成模拟量的运算,主CPU高速地完成开关量运算,所以即使模拟运算速度一般,在开关量控制方面的速度表现还是非常**的。
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