Description
从时间调度上来说。
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-8FE-FX 8Port FX Interface 100baseFX M7i M10i
90 Day Hardware Warranty – Free Overnight Shipping!
Juniper SSG-520-001 Advanced Secure Services Gateway
Nokia NIF4412KIT 2PORT 1000BSX MMD PMC 100 500 Firewall
90 Day Warranty – Free Worldwide Priority Shipping!
Extreme Networks Black Diamond 6808 MSM64i G8Ti Switch
90 Day Warranty, We Accept Corporate PO’s
Enlarge
Cisco ONS 15530 15530-LCMB-0100 – Carrier Motherboard
90 Day Warranty – Free Shipping!
Cisco UBR-CLK-T1 Cable Clock Card – UBR7246VXR 7246VXR
90 Day Warranty – Free Overnight Shipping!
IXIA LM-100TX 4 port 10/100Base-TX Ethernet Module 1600
90 Day Warranty – Free Overnight Shipping!
Cisco IGX-UXME-3-T3 8400 IGX-UXME + BC-UAI-3T3
Free Ground Shipping – 90 Day Warranty
Cisco IGX-UFM-4C Universal Frame Relay Card 4 Port
90 Day Warranty – Free Worldwide Shipping!
Extreme 51034 Multiplexing (WDM) Module BD 6808
30 Day Warranty – Free Shipping!
