热备用系统
在热备用系统中，两台CPU用通讯接口连接在一起，均处于通电状态如图3所示。当系统出现故障时，由主CPU通知备用CPU，使备用CPU投入运行。这一切换过程一般不太快，但它的结构有比冗余系统简单。
PLC的发展历程
　　 在工业生产过程中，大量的开关量顺序控制，它按照逻辑条件进行顺序动作，并按照逻辑关系进行连锁保护动作的控制，及大量离散量的数据采集。传统上，这些功能是通过气动或电气控制系统来实现的。1968年美国GM（通用汽车）公司提出取代继电气控制装置的要求，第二年，美国数字公司研制出了基于集成电路和电子技术的控制装置，**采用程序化的手段应用于电气控制，这就是**代可编程序控制器，称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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