Description
PLC的程序一般不能按事先设定的循环周期运行。PLC程序是从头到尾执行一次后又从头开始执行。（现在一些新型PLC有所改进，不过对任务周期的数量还是有限制）而DCS可以设定任务周期。比如，快速任务等。同样是传感器的采样，压力传感器的变化时间很短，我们可以用200ms的任务周期采样，而温度传感器的滞后时间很大，我们可以用2s的任务周期采样。这样，DCS可以合理的调度控制器的资源。
Juniper PE-2OC3-ATM2-SMIR 2-port OC-3/STM-1 ATM2 IQ PIC
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Datum Symmetricom PRR-10 GPS DS1 Reference Controller
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F5 BIG-IP 3400 (C62) F5-BIG-LTM-3400 Local Traffic Mgr
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Juniper M320-FPC2 Type 2 FPC for Juniper M320 Router
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Extreme Networks Black Diamond 6808 MSM-3 G24T3 Switch
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Cisco OC48/SRP-LR-SC-B OC48 DPT Line Card for GSR12000
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