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。
Nortel DS1404060 8683POSM Passport 8683 POSM 3 Slot MDA
90 Day Warranty – Free Overnight Shipping!
Juniper Netscreen NS5400 NS-5000-8G, 2x NS-5000-2G24T
90 Day Warranty – Free Shipping!
MGX-SMFIR-1-622/C 1OC-12c/STM-4c single height BC 8850B
90 Day Hardware Warranty – Free Overnight Shipping!
Spirent Smartibits SMB-200 GX-1420B AT-9155Cs
90 day Warranty – Free Shipping!
Extreme Networks Black Diamond 6808 MSM64i F96Ti Switch
We Accept Corporate PO’s – 90 Day Warranty!
Alcatel Lucent OmniSwitch 7800 OS7800-RCB-A AC
90 Day Warranty – Free Shipping!
Cisco ESR-HH-1GE 1G SFP w/ ESR-HH-CARRIER Set ESR10000
90 Day Hardware Warranty – Free Shipping!
Cisco ESR-6OC3/P-SMI 6 Port OC3 SM for ESR10008 Router
90 Day Warranty – Free Shipping!
Juniper ERX GE/FE-8 FE_8_I/O Cardset ERX310 710 1410
90 Day Warranty – Free Shipping!
Cisco SPA-OC192POS-XFP 1-port OC192/STM64 POS/RPR XFP
90 Day Warranty – Free Overnight Shipping!
Nokia NIF4536FRU NIF4536 2 Port 10G IP2450 IP1280
90 Day Hardware Warranty – Free Overnight Shipping!
Juniper NS-ISG-TX4 I/O Mod 4-port mini GBIC-TX ISG1000
90 Day Hardware Warranty – Free Shipping!
