Description
DCS安全性：为保证DCS控制的设备的安全可靠，DCS采用了双冗余的控制单元，当重要控制单元出现故障时，都会有相关的冗余单元实时无扰的切换为工作单元，保证整个系统的安全可靠。PLC所搭接的系统基本没有冗余的概念，就更谈不上冗余控制策略。特别是当其某个PLC单元发生故障时，不得不将整个系统停下来，才能进行更换维护并需重新编程。所以DCS系统要比其安全可靠性上高一个等级。
Nokia NIF4501FRU 2 Port Copper Gigabit Ethernet ADP Int
90 Day Warranty – Free Overnight Shipping!
Juniper Networks RE-400-768-S Routing Engine M7i M10i
Max Memory 768M DRAM 90 Day Warranty
Cisco 8OC03/ATM/TS-IR-B Eight-port OC-3/STM-1 ATM SM IR
90 Day Warranty – Free Overnight Shipping!
Cisco AS5400 Chassis AS5400-CH-AC VOIP/Dialup Gateway
30 Day Warranty – Free Shipping!
NEW Cisco 8OC3/POS-SM 8port OC3/STM1 SONET/SDH SM GSR
90 Day Warranty – Free Shipping
Cisco IGX-UXME-8E1-BN IGX UXM-E card w BC-UAI-8E1-BN
90 Day Warranty – Free Worldwide Shipping!
Juniper T320 SIB-S SIB Switch Interface Board
90 Day Warranty – Free Overnight Shipping!
