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什么是PLC冗余系统 PLC 冗余可以分为：软件冗余和硬件冗余。硬件冗余对硬件型号有所要求，连接方式也不同，但对软件并无特殊要求。 在工业自动化系统中大量选用可编程逻辑控制器(PLC)作为控制器，随着技术的发展又组建冗余系统进一步提高系统的可靠性。目前冗余的分类方式很多，而采用PLC冗余方式的有两种，即软冗余和硬亢余。西门子公司在软、硬冗余两方面均给出了解决方案。而基于硬冗余的可靠性高，但构建系统成本也较高。而基于S7—300或S7—400的软冗余是一种成本低又能提高可靠性的方案。目前，软冗余系统已经在冶金、交通、电力、化工、污水处理等工业控制工程中得到了较广泛的应用。但是对于软冗余的性能仍没有进行系统的研究。 什么是硬冗余?需要什么配置要求? 　　硬冗余系统的冗余结构确保了任何时候的系统可靠性，例如所有的重要部件都是冗余配置。这包括了冗余的CPU、供电模件和用于冗余CPU通信的同步模块。根据特定的自动化控制过程需要，还可以配置冗余客户服务器、冗余通讯介质、冗余接口模件IM153-2等。 　　硬冗余系统能够： 　　1. 平滑的主从切换 　　2. 自动事件同步 　　3. 集成的错误识别和错误定位功能 　　4. 操作期间可对系统进行修改 　　5. 类似标准CPU的在线编程 　　6. 下载程序时，只考虑单个CPU，程序可自动拷贝到另一个CPU中。 　　7. CPU修复后自动再进入。 　　8. 运行中所有部件可更换。 软冗余实现原理： 系统运行过程中两个CPU同时启动和运行，但是在正常运行时只有主CPU发出控制命令，而备用CPU检测主CPU状态和记录主CPU发出的命令，当主CPU发生故障时能够延续当时的实际状态接替主CPU发出执行命令。与主CPU通信的IM153—2模块处于激活状态时主CPU能访问I／0模块。当系统发生特定故障时，系统可以实现主备切换，备站接替主站继续运行。 。

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ASTEX AX3030 CIRCULATOR HEAT REDUCER ULVAC TECHNOLOGIES PLASMA SOURCE SUPERIOR ELECTRIC 6180-PI125 INDEXER MOTOR DRIVE NEW BROOKS AUTOMATION ROBOTIC CONTROL UNIT H - MOVE NEW GE MOTORS 5KS215AD105C 15HP 3525RPM 60Hz 3 PH NEW MARCONI RP29411 OVERTURE SINGLE BD CPU CARD CONTROL NEW ALLEN BRADLEY 5730OSSM PYRAMID INTEGRATOR VMS OPERA ALLEN BRADLEY 2760-RB FLEXIBLE INTERFACE MODULE RACAL INSTRUMENTS 5013 POWER SUPPLY DATALOGIC HS860B PARALLEL CONTROLLER ABB 698B076U77 CONVERTER MINIMAG COPA X ASSEMBLY RELIANCE ELECTRIC MODEL RECTIFIER STACK 8647510S 1000V NEW BOC EDWARDS D37360320 TOOL INTERFACE MCM MICRO TIM ROSEMOUNT 1151DR2F22 DRAFT RANGE TRANSMITTER, 316 SST LUXTRON MODEL 1104 MONOCHROMATOR / SEMICONDUCTOR NEW IN BOX SIEMENS 3TF5022-0AK6 NON-REVERSING CONTACTOR ARO SAVAIR STEEL PNEUMATIC CYLINDER J-G3-1680-24N CONTROL TECHNOLOGY CORP 2217 NETWORK COMMUNICATION MOD NEW IAI IS-S-X-M-8-60-3?00-AQ ROBOTIC LINEAR RAIL 21"O/A NEW ALLEN BRADLEY 2755-L7RB BAR CODE SCANNER PARKER COMPUMOTOR 6250 2 AXIS SERVO CONTROLLER NEW TRUMPF CIP2 CONTROLLER INTERFACE FOR LASER 0786924 NEW FLEX-A-SEAL 183001C3RS3 STYLE 30 CARTRIDGE, 1-1/8" ALLEN BRADLEY 190-CPS40* SER A COORDINATED PROTECTED HONEYWELL SENSOTEC MODEL 31 MINIATURE SST LOAD CELL NEW GE CR305F004 MAGNETIC CONTACTOR MOTOR CONTROL ALLEN BRADLEY 190-CPS40 STARTER SYSTEM W 190P010 190A40 NEW TURCK MULTISAFE MS1333EX0T SWITCHING AMPLIFIER ALLEN BRADLEY 1794IE8 INPUT MODULE ANALOG 12BIT 8POINT ACUITY IMAGING CM4000 ANALOG CAMERA AND 1:2.8 50MM LENS NEW SIEMENS FXD63B175 SER B CIRCUIT BREAKER 175A 3 POLE TEKTRONIX TLA 510 LOGIC ANALYZER, 100 CHANNEL, 100 MHZ UTI INSTRUMENTS RF GENERATOR MODEL 2221 WEDGEWOOD TECHNOLOGY 662 UV ANALYZER 662A2V-F-CLF025 WEDGEWOOD TECHNOLOGY MDL 662 UV ANALYZER 662A-F-CLF025 ORIENTAL MOTOR VEXTA UDK5114NW2-M 5 PHASE DRIVER NEW TRUMPF CIP2 CONTROLLER INTERFACE FOR LASER 0563628 WEDGEWOOD TECHNOLOGY 662 UV ANALYZER 662A1V-LF010 GE FANUC IC693APU301M AXIS POSITION MODULE 1 AXIS KOKUSAI ELECTRIC DN130LZTDS HEATER OVER TEMP PROTECTION PEPPERL+FUCHS IVH-F61 DENT-I INDUCTIVE READ WRITE HEAD ALLEN BRADLEY 1794-IE4X0E2 COMBO MODULE ANALOG 12BIT NEW PHD INC TS082X3 PNEUMATIC LINEAR SLIDE NEW ALLEN BRADLEY 17918BC SER B I/O BLOCK 16 PT MODULE NEW FLEX-A-SEAL 283001S2RS2 SINGLE CARTRIDGE, 1-3/4" NEW BACHARACH EIT INFRARED COMBUSTIBLE DETECTOR 51-7472 NEW BOSCH LINEAR SLIDE ACTUATOR 240MM STROKE HONEYWELL TC-IAH161 ANALOG INPUT ALLEN BRADLEY 1494R-N100 ROTARY DISCONNECT SWITCH NEW BALDOR JM7071 AC INDUCTION MOTOR, 2 HP, 3 PHASE SMC US1452 BASE W/ 36 VQZ1155FN1X4 PNEUMATIC VALVES THK LM GUIDE ACTUATOR KR SERIES WITH COVER AND MOTOR NEW APPLIED MOTION 42 SPUR, 42SI020, SPUR GEARHEAD PHYSIO CONTROL 801807-21 BATTERY SUPPORT SYSTEM 120V NEW FLEX-A-SEAL 2230X01C1RS1, 1-3/8" STYLE 30 CARTRIDGE NEW PACIFIC SCIENTIFIC 1.8 STEP MOTOR E33HCHP-LNK-NS-?00 NEW TIMKEN BEARING INNER CONE JM734449 & OUTER CUP 410 NEW WESTINGHOUSE HFD3070 CIRCUIT BREAKER 3 POLE NEW FLEX-A-SEAL 2830X01C1RS1 STYLE 30 CARTRIDGE, 1-3/4" NEW NATIONAL INSTRUMENTS P/N 778926-01 IEEE 1394 BOARD HONEYWELL WG512-AG XYR 5000 WIRELESS TRANSMITTER HONEYWELL WA516-AG XYR 5000 WIRELESS TRANSMITTER MARWAY MPD125 SINGLE PHASE POWER DISTRIBUTION UNIT STI MS4340B TRANSMITTER/REC?EIVER LIGHT CURTAINS 40 INCH NEW CROUSE-HINDS DMV CHAMP SERIES LIGHTING FIXTURE 175W PULS SL 30 POWER SUPPLY DC 24V/30A OUTPUT 3AC 400/500V NEW BALDOR BRUSHLESS AC SERVOMOTOR BSM90A-275BA SMCO NEW SCP LID QTZ-114 QUARTZ DOME WITH NPP MTG COLLAR ENDRESS HAUSER LIQUIPHANT II FTL365 LEVEL LIMIT MEASURE REBUILT PARKER PAVC38R214 VARIABLE PISTON PUMP NEW ATHENA CONTROLS 6275S22F RTD TEMPERATURE CONTROLLER NEW FLEX-A-SEAL 223001S2RS2 STYLE 30 CARTRIDGE, 1-3/8" RACAL INSTRUMENTS 5014 RK INDUSTRIES RK-LPR-503X FLUID PRESSURE REGULATOR SPEEDFAM CLEANING SYSTEM 6G5006TP NEW BALDOR VM7037 AC INDUCTION MOTOR, 1.5 / 2 HP, 3 PH BOSCH PNEUMATIC CYLINDER 3842510832 SPRING LOADED PARKER COMPUMOTOR SX SERIES MICROSTEP DRIVE SX106-178-E OMRON YASKAWA SGDH-02AE-0Y SERVO PACK VERSION 33840 FIBER-LITE MVD-IND-150 CLEANROOM ILLUMINATOR ENCLOSURE 。