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。
New Surplus Nortel 8608SXE 8-port 1000BASE-SX Module
90 Day Hardware Warranty – Free Shipping!
New Surplus Nortel 8348TX-PWR DS1404078 10/100TX POE
90 Day Hardware Warranty – Free Shipping!
Juniper PE-2E3-ATM2 2-port E3 ATM2 IQ PIC M7i M10i
90 Day Hardware Warranty – Free Overnight Shipping!
Cisco BPX-BXM-T3-12 BPX-BXM-T3/E3 12-p T3 Mod BPX 8620
90 Day Warranty – Free Overnight Shipping!
Cisco OC192RO/POS-SR-SC older version OC192E/POS-SR-SC
90 Day Hardware Warranty – Free Shipping!
Alcatel OC-5052 Enterprise Routing Switch Gigabit
Free Shipping – 90 Day Warranty
