GE 531X309SPCAJG1
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。而DCS以同样的速度来处理开关量和模拟量运算,控制周期的指标确实不理想。新型的DCS控制器学习了大型PLC的设计,在控制周期方面的表现获得了大幅度的提高。以NT6000DCS的T2550控制器为例。控制器可以设置四个不同优先级的任务,最小运算周期可以设为10ms,配合高速I/O卡件,控制周期能够达到15~20ms。而模拟量运算设置在其它周期较长的任务中。
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