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什么是系统冗余？
在一些对系统可靠性要求很高的应用中，DCS的设计需要考虑热备份也就是系统冗余，这是指系统中一些关键模块或网络在设计上有一个或多个备份，当现在工作的部分出现问题时，系统可以通过特殊的软件或硬件自动切换到备份上，从而保证了系统不间断工作。通常设计的冗余方式包括：CPU冗余、网络冗余、电源冗余。在极端情况下，一些系统会考虑全系统冗余，即还包括I/O冗余。
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NEW Wheelock 24VDC 115/177 Ceiling Mount Horn/ Strobe 1
NEW Wheelock 24VDC, Ceiling Mount Fire Alerting Strobe
NEW Wheelock NS-24MCW-FR 24VDC Horn-Strobe 15/30/75/110
NEW Wheelock Weather Proof, Strobe, Ceiling, 24 VDC, 11
NITTO OPTICAL Percision Grade Right Angle Prism, 25.4mm
Nova Systems Inc. NovaBlox Video Processing System Mode
NVIDIA P162 128MB AGP DVI/S-Video/VGA Video Graphics Ca
OCP TRP-03BC, OC-3/STM-1 SFP, 10-1308-10 1310nm SFP Tra
PowerWave Technologies MCA9107-50 MCA9000 Series Rack
PUREGAS MOBILE TOOL P440MW3 MANUAL REGENERATIVE DEHYDRA
Pyrex 250 mL Stopper Flask No. 6 4980
Qlogic FC5010409-60 D Network Adapter, 850nm
SMC Modular Type Air Filter AF20-N02C-2Z
Sony CCU-M3 Camera Control Unit
SONY External DVD + - RW/+ - R/CD Drive DRX-500ULX
Sun 270-4373-07 Gigabit Fiber Channel Network Card
Sunnex E214376 Type HS Halogen Lamp, Max 24/20 Watts
TDK Noise Filter ZAP2210-01, 250V AC, 1500V AC
Tektronix VX4363 32-Channel SPST Relay Switch
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Teledyne CCR-33M80 COAX RELAY - 12VDC, SPDT, DC-18GHz
TELZON FRAME TERMINAL BLOCK 485-0000-041
TEXACRO 320290, 2" Pressure Sensitive Adhesive Loop, VE
Toshiba LTM08C351S 800*600 TFT LCD PANEL
Tyan Transport GT24, Dual Core AMD Opteron 2212 2Ghz, 4
Mitutoyo Vernier Caliper 6" Stainless Hardened
Zadian Talos Power Pod 40070-001 UDMA/33
T-Com 515A Option 1 DS1/PCM Simulator
HP AdvanceStack 28681A Bridge LB
Fujitsu F11B-0356-B901 ISDN
Ford TKIT-2005D1-F Box 3 of 4 Rotunda Essential Service
FORD SPECIAL TOOL T92P-1000-LMH/M?H VILLAGER ENGINE TOOL
FORD SERVICE SPECIAL TOOL SET T92P-1000-FLMH Missing T9
FORD ROTUNDA TKIT-2005U-M SERVICE TOOL SET GEAR Box 2 o
Tri Net Inc GR228X In Circuit Test Fixture Rebounder
FORD SERVICE SPECIAL TOOL SET T92P-1000-FLMH Missing T9
FORD ROTUNDA TKIT-2005U-M SERVICE TOOL SET GEAR Box 2 o
Tri Net Inc GR228X In Circuit Test Fixture Rebounder
Research Inc. Control Module 088598-001
Ransco Despatch 924-1-1-D-0 Oven - For Repair
Pelco DA104DT Video Distritubtion Amplifier (1 input, 4
Despatch Industries Model 924-I-I-D-0-120 Oven - For Re
FORD ROTUNDA OTC TKIT-1990-LMH/M?H ENGINE & DIFFERENTIAL
FORD ROTUNDA DIAGNOSTIC SERVICE TOOL SET T93P-1000-LM/M
Sun Microsystems 4-slot I/O Assembly 595-5380-01 With C
Sun Microsystems 370-6774-01 2GB Fiber Channel Expansio
Quantum TH8XG-BA DLT 8000 Loader Drive
Quantum DLT8000 LVD SE TH8AG DLT SCSI Backup Tape
NEWPORT 462 Series ULTRAlign Linear Stage
NEW Mitsubishi Melsec AX82 Programmable Controller AX82
New Airguard Micropleat 99.99995% Efficiency Filter H22
Cadence Design Systems PCI Express SpeedBridge Speed Br
Cadence Design Systems Palladium PCI Express Adaptor AS
Bogen Classic Series C 35 Amplifier
FOR PARTS Hewlett Packard ISDN Interface, 18358A
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HP ProLiant DL145 377884-001 AMD Opteron
NEW Dortronics 5246-K24 Three Button Door Release
HP ProLiant DL145 G2 411095-001
HP ProLiant DL145 G2 411095-001 AMD Opteron
Lot of 3 Simpson DC Amperes Meters
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LSI Bogen Flex Pak Solid State Amplifier CHS-100A
WAVECOM QAM Digital Modulator / Upconverter, UCM4540B
Tara Systems GEDITOR+ TV-Data Line Generator
TARA Systems Geditor+ TV Data Line Generator
TANDBERG TT1280 MPEG-2 HD HIGH DEFINITION PROFESSIONAL
