a-b 艾伦布拉德 1768-L43 CPU模块

PLC还有很多防止及检测故障的指令，以产生各重要模块工作正常与否的提示信号。可通过编制相应的用户程序，对PLC的工作状况，以及PLC所控制的系统进行监控，以确保其可靠工作。

PLC每次上电后，还都要运行自检程序及对系统进行初始化。这是系统程序配置了的，用户可不干预。出现故障时有相应的出错信号提示。

正是PLC在软、硬件诸方面有强有力的可靠性措施，才确保了PLC具有可靠工作的特点。它的平均无故障时间可达几万小时以上；出了故障平均修复时间也很短，几小时以至于几分钟即可。

曾有人做过为什么要使用PLC的问卷调查。在回答中，多数用户把PLC工作可靠作为选用它的主要原因，即把PLC能可靠工作，作为它的可以选择指标。

一年滴尽莲花漏。碧井酴酥沉冻酒。晓寒料峭尚欺人，春态苗条先到柳。 

佳人重劝千**。柏叶椒花芬翠袖。醉乡深处少相知，只与东君偏故旧。

WESTINGHOUSE CO-9H1101N 264C901A05 OVERCURRENT RELAY D565940


IRIS A513 FLAME MONITOR REV D PCB CIRCUIT BOARD D565846


STRUTHERS-DUNN 255ABX114 250V-DC RELAY D565395


IRIS D504 FLAME FAILURE PCB CIRCUIT BOARD REV B D565848


DIS**YCO 8202 PCB CIRCUIT BOARD D565812


GENERAL ELECTRIC GE C92-1 PCB CIRCUIT BOARD D566163


GE FANUC IC610CPU106C SERIES ONE CPU W/3.7K RAM MODULE D565868


DELTEC 05131585-003 REV C PCB CIRCUIT BOARD D566311


PANALARM 85L2H1 ALERT PANEL MONITOR D566113


UNITED ELECTRIC J6-156 PRESSURE CONTROL SWITCH D566481


ATC 306E011A00PX DUOSET DUAL RANGE TIMER 0-240SEC 120V-AC D569329


ALLEN BRADLEY 1794-OE4 FLEX I/O ANALOG OUTPUT MODULE SER B REV C03 D569837


CARL ZEISS 392523 220V-AC 400VA POWER SUPPLY D570032


GE FANUC IC600WD010B SERIES 90-70 I/O CABLE 10FT D566368


CARL ZEISS 110/125/150/250V-AC 250VA POWER SUPPLY D570044


BURR BROWN LDM30-PT LIMITED DISTANCE MODEM D566403


MCVAN P91 10:1 DIVIDER PROBE FOR BWD 881 POWERSCOPE II D566589


MCVAN P90 1:1 PROBE FOR BWD 881 POWERSCOPE II D566587


402856-AD 402856-0 PCB CIRCUIT BOARD POWER MODULE D570441


MILLIPORE IPT 122 PRESSURE GAUGE SWITCH -30-0-200PSI 11.5-28V-DC D570563


KAJAANI 05J1D-3 A4050248B PCB CIRCUIT BOARD D570388


PANALARM 91AF1KN120AC PCB CIRCUIT BOARD D570475


EMERSON KL4501X1-BE1 12P4983X292 DELTAV CHARM ADDRESS PLUG 5 REV F D566987


ALLEN BRADLEY 700-RTA00V000Z1 TYPE RTA SOLID STATE TIMER 115-125V-DC D567044


ALLEN BRADLEY 1492-CABLE025Y PRE-WIRED CABLE-WIRE SER C D569692


PANALARM 090-0065-3-01 92AF1KN120AC PCB CIRCUIT BOARD D570139


HALMAR ROBICON 115Z-C-FK2 HEAT RESISTOR POWER CONTROLLER 80/480V-AC D570706


ALLEN BRADLEY 1771-0D ISOLATED OUTPUT MODULE SER C REV N02 120V-AC D570903


ALLEN BRADLEY 2090-XXNPMP-16S03 SERVO MOTOR 3M POWER CABLE SER A D570883


RAD IMB-CL REV 1.0 PCB CIRCUIT BOARD D570769


RAD IMB-PS/AC POWER SUPPLY 100-120V-AC 6A AMP PCB CIRCUIT BOARD D570768


RAD IMB-MLF IM-CML REV 1.0 PCB CIRCUIT BOARD D570688


RAD IMB-RJ45/8 REV 0.0 8-CHANNEL COMMUNICATION MODULE D570780


RAD IMB-CL IM-CML REV 1.1 PCB CIRCUIT BOARD D570814


RAD IMB-MLF IM-CML REV 1.1 PCB CIRCUIT BOARD D570811


FLYGT ENM-10 LEVEL REGULATING FLOAT SWITCH 0.95-1.10G/CM3 D571050


GENERAL ELECTRIC GE C81 INPUT CONV PCB CIRCUIT BOARD MODULE D567342


TELEMECANIQUE XY2 CE2A196H7 CABLE CONTROLLED EMERGENCY STOP D571300


WIDGET WORLD LD485A-MP 9406 V1.2 CONVERTER DRIVER BOARD D570857


BEHA DR701 UNITEST PHASE ROTATION TEST KIT D571562


BEHA UNITEST WIRE SORTER TEST KIT D571565


BURNDY YAL8CT38 HYLUG COPPER COMPRESSION TERMINAL LUG 3/8 IN RED D567384


DIAMOND POWER 333088-1032 UNIVERSAL ALARM REV E PCB CIRCUIT BOARD D567063


5865 017703 CONTROL MODULE EXTENDER CARD BOARD D567111


HONEYWELL MHP-TR2AL MICRO SWITCH PHOTOELECTRIC SENSOR RECEIVER D571133


CALEX 32024E CONVEL 100-230V-AC 24-28V-DC 7.2A POWER SUPPLY D571292


SAIA XVJ B18G27 PROXIMITY SWITCH D567285


BOX OF 50 BURNDY YAL4CT38 HYLUG 3/8IN 4AWG COMPRESSION CONNECTOR D567578