熱備用系統(tǒng)
在熱備用系統(tǒng)中，兩臺(tái)CPU用通訊接口連接在一起，均處于通電狀態(tài)如圖3所示。當(dāng)系統(tǒng)出現(xiàn)故障時(shí)，由主CPU通知備用CPU，使備用CPU投入運(yùn)行。這一切換過(guò)程一般不太快，但它的結(jié)構(gòu)有比冗余系統(tǒng)簡(jiǎn)單。
PLC的發(fā)展歷程
在工業(yè)生產(chǎn)過(guò)程中，大量的開(kāi)關(guān)量順序控制，它按照邏輯條件進(jìn)行順序動(dòng)作，并按照邏輯關(guān)系進(jìn)行連鎖保護(hù)動(dòng)作的控制，及大量離散量的數(shù)據(jù)采集。傳統(tǒng)上，這些功能是通過(guò)氣動(dòng)或電氣控制系統(tǒng)來(lái)實(shí)現(xiàn)的。1968年美國(guó)GM（通用汽車）公司提出取代繼電氣控制裝置的要求，第二年，美國(guó)數(shù)字公司研制出了基于集成電路和電子技術(shù)的控制裝置，**采用程序化的手段應(yīng)用于電氣控制，這就是**代可編程序控制器，稱Programmable Controller（PC）。
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DATALOGIC 937401034 NSFP 937401034
DATALOGIC DS6100-1100 USPP DS61001100
DATALOGIC DS6100-3000 NSFP DS61003000
DATALOGIC DS6400-105-015 USPP DS6400105015
DATALOGIC DS8100-4000 SH1937
DATALOGIC DS8100-4000 USPP DS81004000
DATALOGIC DS8100A-2010 USPP DS8100A2010
DATALOGIC DX8200-2100 USPP DX82002100
DATALOGIC LD94010E USPP LD94010E
Datalogic Matrix 400 600-010 2D Barcode Reader Scanner
Datalogic Matrix 400 600-010 2D Barcode Reader Scanner 937401005 (NIB)
DATALOGIC MATRIX-2055 NSFP MATRIX2055
DATALOGIC MATRIX-2061 USPP MATRIX2061
DATALOGIC PMC-10 NSFP PMC10
DATALOGIC SC6000-1200 USPP SC60001200
DATALOGIC SC8000-21XX NSPP SC800021XX
DATAMAN DATAMAN-848PRO USPP DATAMAN848PRO
DATAMYTE 953-07 USPP 95307
DATaRec GSR20 Heim Systems Ground Station Digital Data Recording Record
DataTaker DT605 Series 3 Intelligent Universal Input Industrial data logger
DATATAPE AN-USH 34 (V)
DATATEST 90-CON/PC NSPP 90CONPC
Datron 1271 Digital Voltmeter - Excellent Condition
Datron 1281-10-20-30-70-80
Datron 4000A Autocal AC Standard Calibrator
DATRON 4200A/10/80 AC CALIBRATOR,(1mv-1100V), TESTED
Datron 4700
Datron 4700 General Calibrator
Datron 4708 -20
DATRON 4800 ( 4807 ) Calibrator with cert. FOR RENT or SALE, sub for 4808 ???
Datum 9650-601 Video Time Inserter (Power Supply)
David Brown 1.84:1 400HP Radicon Parallel Speed Reducer AH1:280
DAVID BROWN 160:1 DRIVE / REDUCER C0421160FGHH1 C0421160FGHH1
DAVID BROWN M03223.6BENV6C2.0B TEXTRON NB145HC2.0B5
DAVID BROWN RADICON Q092028BRN 28:1 ALLEN BRADLEY 1326AB-B7400-S2L
DAVID BROWN RADICON WORM GEAR AA2002U 25-1
DAVID BROWN RADICON WORM GEAR REDUCER SIZE 10 35-1 RATIO
Davidson Optronics D 656 Autocollimator, Two Axis
DAVIDSON OPTRONICS D-638 Two Axis Autocollimator
Davidson Optronics D-656 Two Axis Autocollimator
Davidson Optronics D-656 Two-Axis Autocollimator
Davidson Optronics D662 Micro Signal Autocollimator Mesa I
Davidson Optronics K-4000 K-SERIES Optoliner System with 5 Slides & Accesories
Davidson Optronics K-4000 Optoliner System
DAVIDSON OPTRONICS K-4000 TV OPTILINER SYSTEM
Davidson Optronics Two Axis Autocollimator Model D 656 D656
DAVINCI, DIGITAL MEDIA, EVAL MOD, TMDXEVM6467T 1853797
Davis-Standard Wire Extrusion Air Knife- Dual Blower
DAWN INDUSTRIES 11-1005686-03 USPP 11100568603
DAWN INDUSTRIES VMERACK USPP VMERACK
DAWNCO DAWNLINK-SAT SPECTRUM ANALYZER FORSAT PLUS CHANNEL ID SAT
DAYKIN MDGTC-05 NSFP MDGTC05
Dayton 15 hp 3-Phase, 208-230V/460V Motor, 2RKZ4,
DAYTON 5HV53 NSFP 5HV53
DAYTON AC Adj Frequency Drive, 25 HP, 3 PH, 460V 1LNF5
DAYTON B4154M1S10 AC 100HP 230/460V 1775RPM 445USD 3PH MOTOR D212028
DAYTRONIC 10BDR64/006 H/W 4.1 INTERFACE CARD 10BDR64
DAYTRONIC 10K8 USPP 10K8
DAYTRONIC 10K8A USPP 10K8A
Daytronic 10KN6-2 Mainframe-48 "A" Slots System 10-2000
DAYTRONIC 9020 USPP 9020
Daytronic System 10 DataPAC Model 10K7 with 32 10A64-8/002 Module Boards
DBM CNG-1-800/2400 Automated Carrier to Noise Generator 2GHz, 1
DBM Optical CSA Component Spectrum Analyzer Model#-2004
dBm Optics Model 4200 1510-1620nm Tunable Laser Source
DBM-110-007 UNKNOWN MOTORS
DBM24I16 CIRCUIT BOARDOUT OF
DBMM-110-004 UNKNOWN MOTORS
DC 150 H.P. Motor (General Electric)
DC 24V to 12V 3A 36W Converter Step Down Regulator Car LED Power Supply
DC BRUSH DRIVE W/BRAKE & ENCODER;HURTH;HFP50;3 KW
DC BRUSH DRIVE;SCHABMULLER;26,21/150;TYP#:P150/1-459/339;24 V;54 A;1785 RPM;1 KW
DC BRUSHLESS AIR BEARING SPINDLE MTI WITH SPINDLE DRIVE AND COOLANT HOUSING
DC BRUSHLESS SERVO MOTOR MTS30U4-42
DC DC Converter Step down 12V/24V to 5V 20A 100W Car Led Power Supply
dc drive
DC Drive 150 HP Special Purpose SP-200
DC Electrical Motor 430 kW Siemens
DC Field Circuit Breaker 600A Frame 250V DC 2-Pole
DC GENERATOR HUTTINGER ELEKTRONIK PFG 150 DC
DC LINK CONTROLLER FOR KRC 32 NM100ABN
DC MOTOR 04205 HP-1 1800 RPM CAMCO MSHV55741-7C WITH SRF3752-4984-84-5-56BC-CU
DC Motor 50 HP 1750 RPM 36*T DPFG STAB SHUNT 36500420000
DC MOTOR CONTROLLER ABB DCS 800
DC Motor, 20HP, 92TY12, 675/2600RPM for Vaughn Machine
DC POWER MODULE 5V, 20A, 100W, N6741B 1777876
DC Rectifier Power Supply Dynatronicx CRS 9-250
DC TACHOMETER 601A100-2
DC/DC Converter Regulator 24V Step Down to 12V * 60W
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