PLC的故障多发点有哪些？
1）继电器、接触器。
2）阀门、闸板。
3）开关、极限位置、安全保护、现场操作的一些元件或设备。
4）PLC系统中的子设备。
5）传感器、仪表。
6）电源、地线、信号线的噪声。
维修PLC先后顺序是怎样的？
先动口再动手
1）维修PLC时，不要立即直接动手，而是先询问故障发生前后的情况、故障现象。
2）如果对生疏的PLC维修，应先了解其工作原理。
先清洁再维修
维修PLC时，可以打开机子，首先进行清洁PLC。
先外后内
维修PLC时，先检查外部现象与原因，如果外部正常，则然后检查PLC内部。
先无电判断后通电判断
首先在没有通电的情况下，先判断熔丝是否损坏、是否不通电就可以判断出故障点。如果不能够判断出来，则再通电检查PLC。
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REES 1/2" LIMIT SWITCH 01791-100 ........ WL-197
REES LIMIT SWITCH 01752-100 ........ WL-198
REES LIMIT SWITCH 1752L ........ WL-200
REES LIMIT SWITCH 1752R ........ WL-199
RELAY FOR AUTOMATIC EXCHANGE WG-123... ZA-63
RELAY FOR AUTOMATIC EXCHANGE WG-123... ZA-63
RELAY FOR AUTOMATIC EXCHANGE WJ-9 .. ZA-66
RELAY FOR AUTOMATIC EXCHANGE WK-18 .. ZA-64
RELAY FOR AUTOMATIC EXCHANGE WK-47 ZA-65
RELAY FOR AUTOMATIC EXCHANGE XWA-10 ... ZA-61
RELAY FOR AUTOMATIC EXCHANGE XWA-31 ... ZA-58
RELAY FOR AUTOMATIC EXCHANGE XWA-31 ... ZA-58
RELAY FOR AUTOMATIC EXCHANGE XWJ-10 .... ZA-62
RELAY FOR AUTOMATIC EXCHANGE XWJ-16 ... ZA-57
RELAY FOR AUTOMATIC EXCHANGE XWK-10 .. ZA-60
RELAY FOR AUTOMATIC EXCHANGE XWK-10 .. ZA-60
RELAY FOR AUTOMATIC EXCHANGE XWK-58 .. ZA-59
RELAY FOR AUTOMATIC EXCHANGE XWK-61... ZA-56
RELIANCE 1400 AMPS 600V. CLASS L FAST ACTING LCU 1400 YF-123
RELIANCE 300 AMP 600V. CLASS RK5 ECSR 300 ............... VE-264
RELIANCE 400AMPS 600V. DUAL-ELEMENT FUSE ECSR 400 YF-118
RELIANCE 600AMPS 250V. TIME DELAY-DUAL ELEMENT FUSE ECNR 600 YF-121
Reliance Automate Dual Input Module Model 45C40 ... WR-26A
Reliance Automate Dual Input Module Model 45C44 ... WR-26B
Reliance Automate Dual Output Module Model 45C60... WR-26C
Reliance Automate Programmable Controller Model 45C1A ... WR-26
Reliance Electric DSC Power Supply 15-20HP, 3Ph, S6-DIG ...VY-106
RELIANCE TIME DELAY, DUAL ELEMENT ECNR 400 FUSE ............ VL-50A
RELIANCE TIME DELAY, DUAL ELEMENT, CURRENT LIMITING FUSE ECSR150 ....... VE-47
RELIANCE TIME DELAY, DUAL ELEMENT, FUSE 100A. LENRK 100 YF-323A
RELIEF VALVE 250-3/4-75 BRonZE McDONNELL&MILLER ZB-177
Reynolds & Reynolds Powervator UV-1 Emergency Power Source .. Encl-003
ROBERTSHAW 4200-017 COMMERCIAL GAS THERMOSTAT ZC-39
RobertShaw 700-454 120VAC Combination Gas Valve ZC-09
ROBERTSHAW APPLIANCE THERMOSTAT LD290 ... VV-257
RobertShaw Temperature Transmitter T150-1054 ... ZD-28
Rockwell Video Solutions Cabinet/Camera-Internet link R9604 .. WF-73
ROSSI Motor Duttori Type 71M-2GPF/238 , 1200 Rpm .. VW-200
FUSE ................ VE-312
RUN BREAK-A-BEAM WO-55
RUSSELLSTOLL 7428-78 60A-250/600VAC 4PRONG PLUG ZL-165
RUSSELLSTOLL ConNECTOR JCS1034H 100-Amp 3P 4W 600-VAC ZJ-07
RUSSELLSTOLL JPA106 ADAPTOR FOR ConDUIT 100AMP ... ZL-169
Russellstoll Receptacle 60A, 480VAC Cat# 3324 ... VH-45
S&C ELECT. COMP. SM-5 REFILL UNIT FOR POWER FUSE TYPE SM CAT # 131400 ... VJ-54
S&C ELECT. COMP. SM-5 REFILL UNIT FOR POWER FUSE TYPE SM CAT # 131600R4 VJ-55
S&C ELECTRIC COMP SM-4 REFILL UNIT CAT No. 122050 30 AMP. ... VE-276
S&C ELECTRIC COMP SM-4 REFILL UNIT CAT No. 122200 125 AMP. 14.4 KV ... VE-275
S&C ELECTRIC COMP SM-4 REFILL UNIT CAT No. 122200 125 AMP. 15 KV ... VE-282
S3 Technologies DIGI-3 Digital Input Model # A9032-003 (Crack) ... BU-106
S3 Technologies DIGI-3 Digital Input Model # A9032-003 (Lg Crack) ... BU-107
S3 Technologies DIGI-3 Digital Input Model # A9032-003 ... WC-99
S3 Technologies DIGI-3 Relay / Lamp Output Model # A9052 (Chip) ... BU-104
S3 Technologies DIGI-3 Relay / Lamp Output Model # A9052 (Crack)) ... BU-103
S3 Technologies DIGI-3 Relay / Lamp Output Model # A9052 (Lg Chip) ... BU-105
S3 Technologies DIGI-3 Relay / Lamp Output Model # A9052 ... WC-100
S3700 SERIES RIM EXIT DEVICE BY ARROW 3708LHR ... PB-02
S3700 SERIES RIM EXIT DEVICE BY ARROW 3708RHR ... PB-03
S3800 SERIES RIM EXIT DEVICE BY ARROW 3808LHR-CP ... PB-01
Safe Foods Corp UV Ballast PN: 20B60 .. UV Lamp PN: 10B60 ... WD-31
Saftronics Solid State Motor Starter 600A Cat# EZ6-500 ... UH-01
SALZER ROTARY CAM DRUM ROTARY SWITCH 315AMP MODEL S825 .......YH-431
SAMSUNG / FARA MOSCON-E5 MOTOR DRIVE MODEL: SI-21P5E5+ .......WL-74
SANGAMO ADF-7 AMPERE DEMAND METER 5 AMP. CAT No. 981851-100 ........WG-11
SANGAMO CURRENT TRANSFORMER 500:5A TYPE B6M LOT-21
SANGAMO CURRENT TRANSFORMER CAT# 71689 .... 3000:5A *64A
SANGAMO VOLTAGE TRANSFORMER CAT# 72055 .... MM-01
Saunders Saunair EC Piston Actuator .. 8 Bar # 33754 .. UJ-07
SCHNEIDER ELECTRIC Grounding Bar PK23GTA ... VV-414
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Scott Industries Dual Gas Tox-Alarm Series 5302 ... WF-35
SEALMASTER 2-14 INSERT BEARING 1 1/4INCH BORE ... MM-202