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PLC的故障类型有哪些？
外部设备故障
外部设备就是与PLC实际过程直接联系的各种开关、传感器、执行机构、负载等。这些设备发生故障，会直接影响PLC系统的控制功能。因此，维修PLC，首先要分清是外部设备故障，还是PLC本身故障。
系统故障
1）系统故障是影响PLC系统运行的全局性故障。
2）PLC系统故障可以分为固定性故障、偶然性故障。
3）故障发生后，可以重新启动使系统恢复正常，则就是偶然性故障。如果重新启动不能恢复，而是需要更换硬件或软件，系统才能够恢复正常，则认为是固定性故障。
硬件故障
PLC硬件故障主要指PLC系统中的模板、电路损坏而造成的故障。
软件故障
PLC软件故障包含软件错误、操作错误等。PLC软件故障一般可以通过PLC本身的自诊断测试功能或者软件来查看、检查。
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GE Fanuc IC 694 TBB 032B IC694TBB032B High Density Terminal Block NIOB ABY2
GE Fanuc IC200PWR001A VersaMax 24VDC Power Supply CSQ
GE Fanuc IC6939PWR321AA Power Supply Series 90-30 CSQ
GE Fanuc IC693ALG221B 4 Point Analog Input Current CSQ
GE Fanuc IC693ALG221C 4PT Analog Input Current IC 693 ALG 221C GPP
GE Fanuc IC693ALG221C Input Analog 4PT Current *Missing Door GPP
GE Fanuc IC693ALG391B Output Analog 2PT Current GE 90/30 *Missing Door GPP
GE Fanuc IC693ALG391B Output Analog 2PT Current IC 693 ALG 391B GPP
GE Fanuc IC693ALG391C Ouptut Analog 2PT Current CSQ
GE Fanuc IC693ALG391F Output Analog 2PT Current
GE Fanuc IC693CHS391M 10 Slot Base EMI Enhanced CSQ
GE Fanuc IC693CMM321-CD Ethernet Controller GE 90/30 Series missing cover GPP
GE Fanuc IC693CPU331K Series 90-30 CPU Module CSQ
GE Fanuc IC693CPU363-CJ CPU Module 240K User MEM CSQ
GE Fanuc IC693MDL930D Output Realy Module 8PT CSQ
GE Fanuc IC693MDL930F Output Relay 4A 8pt Isolated GPP
GE Fanuc IC693PWR321N Power Supply 120/240VAC 125VDC 30W 90-30 GPP
GE Fanuc IC693PWR321N Power Supply 120/240VAC 125VDC 30W 90-30 GPP
GE Fanuc IC693PWR321U Power Supply 120/240VAC 125VDC STD GPP
GE Fanuc IC693PWR321X Power Supply 120/240VAC 125VDC STD GPP
GE Fanuc IC693PWR321X Power Supply 120/240VAC 125VDC STD GPP
GE Fanuc IC693PWR321Z Power Supply 120/240VAC 125VDC 30W CSQ
GE Fanuc IC697MDL653E FS Discrete Logic Input Module 24VDC CSQ
GE General Electric 12IFC53A1A Inverse Time Overcurrent Relay NIOB BCK
GE General Electric 12IFC53B2A Time Overcurrent Relay in Open Box BCK
GE General Electric 5KCP39RG-P926AS Motor 460 V 1620 RPM CSQ
GE General Electric 9F62DCB175 Fuse 5500V 5.5KV 175A NIB SAR
GE General Electric 9F62DCG175 Fuse 2300V 175A NIB SAR
GE General Electric A03B-0819-C002 Fanuc ABU05A Base Unit 5 Slots No Box CSQ
GE General Electric A16B-2200-0210/05A Fanuc PC Board Serial Port CSQ
GE General Electric A16B-2200-0855/04B Fanuc PC Board Axis Control CSQ
GE General Electric A20B-3900-0288 Fanuc CPU Card in Bag CSQ
GE General Electric AC361R Bus plug Flex-A-Plug 30AMP CSQ
GE General Electric AC421R 31A Bus plug Flex-A-Plug 240V 3 Pole Fusible CSQ
GE General Electric Button Enclosure Oil Temp Control CSQ
GE General Electric CR2790E100N21 Control Relay CSQ
GE General Electric IC200MDL940D Isolated Output Relay Form A in Box CSQ
GE General Electric IC675PDL161A Profibus Station in Box Factory Sealed CSQ
GE General Electric IC693PWR321Z IC693PWR321 CSQ
GE General Electric ML 4006L4002BAG001 Brushless Exc Power Module SAR
GE General Electric PLE2ESBG0 Electronic Power Meter Power Leader EPM BCK
GE Harris Westronic WESDAC D20 202/V.23 Modem 520-0120 GPP
GE Harris Westronic WESDAC D20 A Logic Panel Control Output Module GPP
GE Harris Westronic WESDAC D20 K WESTERM D20 KR Control Output Module GPP
GE Harris Westronic WESDAC D20 S WESTERM D20 KR Control Output Module GPP
GE Harris Westronic WESTERM D20M+ SS Termination Panel GPP
GE IC 200 MDD 844J IC200MDD844J I/O Module 16 PT DC Input / 16 PT DC Output SNC
GE IC 647 CBL 703C IC647CBL703C 90-70 To Work Master II KEV
GE IC 693 ALG 220F IC693ALG220F 4 Pt Analog Output Voltage Module clean WEM
GE IC 693 MDL 645 D IC693MDL645D Input Module CSQ
GE IC200MDL64OB 16PT Input Module In IC200CHS002A I/O Carrier CSQ
GE IC200MDL940A Output Relay In IC200CHS002A I/O Carrier CSQ
GE IC3600SPRD PC Board SAR
GE IC660TBA106K Genius Terminal Assembly CSQ
GE IC660TBA106K Genius Terminal Assembly CSQ
GE IC693BEM331A Series 90-30 Genius Bus Controller BEM331 IC 693 BEM 331A CSQ
GE S0DA36ANO600 600 Amp Molded Case Switch 600 VAC CSQ SCI
GE Spectra RMS SELA36A10100 Mag-Break Circuit Breaker 100AMP 3Pole CSQ
GEC K81PEX 100A Fuse BS 2692-1975 100 Amp BCK
GEC K81PEX 250A Fuse BS 2692-1975 250 Amp BCK
GEC K81PEX 350A Fuse BS 2692-1975 350 Amp BCK
GEMS LS-1700 Level Switch 01702 LS1700 in Open Box CSQ
GEMU 554 15D31 9 51 4 55415D319514 1/2" Bronze Angle Valve w/ Actuator DRC
GEMU 60025D331521 600V 1" T-Union PVC Diaphragm Valve NIOB DRC
GEMU 673040B80415E0-1508 Type 673 1-1/2" Sanitary Diaphragm Valve NIB DRC
GEMU 67725DCC15201155 Type 677 V 1" T-Union PVC Diaphragm Valve Lock NIOB DRC
GEMU 687 40D5540501 Sanitary Diaphragm Valve Stainless Steel 1 1/2" 316L DRC
General Controls K10AA248 Magnetic Valve CSQ
General Electric 15D6G2 Coil 115V 60Hz Other CSQ
General Electric CK08CE300 Contactor 120VAC Coil 125HP @ 460VAC CSQ
Giddings & Lewis 502-03518-22R1 5020351822R1 PIC900 Analog Output CSQ
Giddings & Lewis 502-03518-22R2 5020351822R2 PIC900 Analog Output CSQ
Giddings & Lewis 502-03782-02R1 5020378202R1 Encoder Unit PiC900 CSQ
Giddings + Lewis 502-04111-11 Programmable Industrial Computer PiC900 CSQ
GL&V 581041 Remote Keypad Unit Impco Jones FS CSQ SCI
Go PR5-103076 Pressure Gauge in Open Box DRC
Gould 3BJK04 R.B. Denison Lox-Switch Nema B300 Ser.A 1284 CSQ
Gould Modicon AS-M84A-002 Programmable Coontrollers CSQ
Gould Shawmut 67083 Fuse Holder CSQ
Gould Shawmut A4BY2000-BG A4BY2000BG Fuse 2000A, 600V NIB SAR
Gould Shawmut A4J175 175AMP Fuse 600VAC Class J FP15-63 CSQ
Gould Shawmut A50P200 Type 4 Form 101 200A 500V CSQ *LOT OF 9
Gould Shawmut A50P350 Type 4 Fuse Amptrap 350Amps 500Vac CSQ *lOT OF 6
Gould Shawmut A70P125 Type 4 Fuse 125AMPS 700VAC *LOT OF 4 CSQ
Gould Shawmut A70Q350 Type 4 Fuse Form 101 350AMPS 700VAC CSQ
Gould Shawmut A70Q600 Type 4 Fuse 600AMPS 700VAC CSQ
Gould Shawmut AmpTrap A50P700-4 Semiconductor Fuse NIOB BCK
Gould Shawmut AmpTrap A50P800-4 Semiconductor Fuse NIOB BCK
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