故障检查与排除
（1）故障显示
①设计时可使每一个故障点均有信号表示。优点是直观便于检查，缺点是程序复杂且输出单元占用较多，投资较大；
②设计时也可将所有故障点均由一个信号表示。优点是节约成本，减少了对输出单元 的占有，缺点是具体故障回路不能直接判断出；
③设计时还可将性质类似的一组故障点设成一个输出信号表示。
以上三种方案各有利弊，在条件允许、并且每个回路均很重要，要求必须快速准确判断出故障点时采用第一种方案较好；一般情况下采用第三种方案比较好，由于故障分类报警显示，就可直接判断出故障性质，知道会对设备或工业过程造成何种影响，可立即采取相应措施加以处理，同时再结合其它现象、因素、另一组或几组报警条件将具体故障点从此类中划分出来。整个PLC内部程序、外部输出点及接线增加不多，性能价格比较高。
（2）输入、输出故障的排除
一般PLC均有LED指示灯可以帮助检查故障是否由外部设备引起。不论在模拟调试还是实际应用中，若系统某回路不能按照要求动作，首先应检查PLC输入开关电接触点是否可靠（一般可通过查看输入LED指示灯或直接测量输入端），若输入信号未能传到PLC，则应去检查输入对应的外部回路；若输入信号已经采集到，则再看PLC是否有相应输出指示，若没有，则是内部程序问题或输出LED指示灯问题；若输出信号已确信发出，则应去检查外部输出回路（从PLC输出往后检查）。
在输出回路中，由于短路或其它原因造成PLC输出点在内部粘滞，只需将其接线换至另一予留的空接线点上，同时修改相应程序，将原输出标号改为新地址号即可。
PLC虽然适合工业现场，使用中也应注意尽量避免直接震动和冲击、阳光直射、油雾、雨淋等；不要在有腐蚀性气体、灰尘过多、发热体附近应用；避免导电性杂物进入控制器
ALLEN-BRADLEY LONG ConNECTION ROD 149V-RA4 *NEW*
CMI MODUTEC 0-150 PANEL METER 00890232001 *NEW*
PEPPERL & FUCHS V19-G-BK5M-PUR 30 VDC FEMALE CABLE CONNECTOR, NEW
ALLEN BRADLEY GREEN OPTIC PILOT LIGHT 800EP-PL3 SER. A *NEW, LOT OF 3 *
BANNER 10-30VDC PHOTOELECTRIC SENSOR Q45BB6FQ5
ALLEN BRADLEY COMMUNICATION ADAPTER CABLE 1771-CR
IF EFECTOR 10-36VDC, 250MA, S=2MM, INDUCTIVE PROXIMITY SENSOR IF5711 *NEW*
TELEMECANIQUE 12-230V UNIT base & COVER, XVB C21, NIB
IFM TS50100 REFLECTORS, E20453 *NEW LOT OF 3*
PETER PAUL 24V 9.5W 3/16" X 3/32" ORIFICE SOLENOID VALVE, 23PK9ZGM, NNB
ATLAS COPCO ConNECTION BOARD PCB 4240 5204 00
ALLEN BRADLEY FUSIBLE DISConNECT SWITCH 40021-558-02 W/ 40023-415-02
NUMATICS 5-125V AC/DC PROXIMITY SWITCH RSQ02 *NEW*
CUTLER HAMMER 24VDC COIL RELAY D2PR23T1-A2 *NEW*
FANUC ROBOTICS 230VAC COOLING FAN ASSEMBLY A06B-6078-K001
HonEYWELL AT88A1021 75VA TRANSFORMER, NIB
IFM MAGNETIC SENSOR MK5107
COMAIR ROTRON FLIGHT IT 12VDC .31A COOLING FAN FN12B3X *LOT OF 2*
COOPER BUSSMANN CLASS H FUSE REDUCER 626 *NEW*
ADVANCE 120V .50A SLIMLINE BALLAST, SM-151-S-TP *NEW*
ADVANCE TRANS 277V 60HZ MARK III ENERGY SAVER LAMP BALLAST V-2S110-TP *LOT OF 2*
COOPER BUSSMANN FUSE REDUCER 626-R AND 626 *LOT OF 2*
TYCO ELECTRonICS 120VAC COIL 40A ConTACTOR 3100-30T903JR
GE OVERLOAD RELAY 56-65 AMPS CR7G5XH
POTTER & BRUMFIELD 24V DC RELAY KHP17D11 *LOT OF 5*
GENERAL ELECTRIC PUSH BUTTON 080ADC 080C11G NIB
VECOBLOC TAPER-LOCK 40-25-1610 80 07 019 NIB
BUSS UP TO 2-1/2" DIAMETER, FUSE PULLER FP-3 *NEW SEALED*
CUTLER-HAMMER 15A 125-250VAC LIMIT SWITCH E47BMS03 *NEW, LOT OF 2*
FESTO AR-01 4936 D1061 ROLLER ARM NIB
BANNER LOGIC MODULE LM1 *NEW*
FUJI ELECTRIC 2A 2-POLE CIRCUIT BREAKER CP32FS/2 *NEW*
L-COM CABLE CHD15MM-10 NIB
FUJI ELECTRIC 3A 2-POLE CIRCUIT BREAKER CP32FM/3W *NEW*
PARKER 15-PIN BREAKOUT WIRING TERMINAL VM15-PF
NASON 4-PIN PRESSURE SWITCH, SP-19A-10F/ESAU?127
PILLAR INDUSTRIES POWER ConTROL BOARD AB6332-4(B)
LINCOLN ELECTRIC 1/16"-3/32" WIRE SIZE ConVERSION KIT, T-13724-B *NEW*
TURCK SPLITTER CABLE VBRS 4.4-2RK 4T-0.3/0.3 *NEW*
TURCK EUROFAST ConNECTOR CABLE RK 4.4T-5 *NEW*
TEXAS INSTRUMENTS PLC MOUNTING base 7MT902
KLOCKNER MOELLER 600VAC MANUAL MOTOR STARTER / PROTECTOR PZKM 3-10-U-NA
STI NON-ConTACT SAFETY INTERLOCK ConTROL UNIT MC-S024/110/220
IDEC 24VDC 2.1A 50W DC POWER SUPPLY PS5R-D24
BANNER 10-30VDC PHOTOELECTRIC SENSOR OPBP2QDH W/ OPERATING HEAD OSBDX
KLOCKNER MOELLER 25A 600VAC ROTARY CAM SWITCH T3-1-102
ALLEN BRADLEY 24VDC GENERAL PURPOSE RELAY 700-HA3Z24 SER D *NEW, LOT OF 2*
NIDEC 12VDC .22A FANS, TA225DC, NEW LOT OF 2
EATON CUTLER-HAMMER FIBER OPTIC PHOTOELECTRIC HEAD E51DF3 SER. B4 *NEW*
FUJI ELECTRIC 30V GREEN PUSHBUTTON AR22G2L-10B3G *NEW*
ALLEN BRADLEY 24VDC COIL TYPE PK DirectDrive DC RELAY 700DC-PK400Z24
BLACK BOX POWER SUPPLY FOR INTERFACE ConVERTER RACK RM005
SIEMENS ITE 125VDC 20A SINGLE POLE CIRCUIT BREAKER E41B020 *LOT OF 5*
GOULD SHAWMUT TRI-onIC TRS125R CLASS RK5 600 VDC 125 AMPS TIME DELAY FUSE, NIB
GENERAL ELECTRIC 230/400V 25A CIRCUIT BREAKERS, C25 *LOT OF 2*
APPLIED ROBOTICS 95507-B1077A LIMIT SWITCH W/ BRACK AND SCREWS, NNB
ADVANCED TECHNOLOGY & TESTING / WILSON 505-C AMPLIFIER / COMPARATOR, NNB
DYNAQUIP ConTROLS DC-2122 1/4" CONNECT/DISCONN?ECT PLUG, LOT OF 6, NIB
INTERlink BT RSF-580-0.5 M CABLE, NEW IN BAG
TURCK / EURO FAST RK 4T-1 4 P FEMALE CORDSET, NEW IN BAG
TURCK VAS 22-F653-2M-RS5.?3T CABLE, NEW IN BAG
STEVECO 220-250VAC 60HZ MOTOR START CAPACITOR, CS88250 *NEW*
YALE MICROSWITCH YT129727054 *NEW, LOT OF 2*
MOELLER 110V COIL MINI RELAY W/ AUXILIARY ConTACT DIL ER-40 W/ 22 DIL E
T.P.C WIRE & CABLE 10-POLE, 6FT, SUPER TREX QUICK-ConNECT 83286 *NEW,SEALED*
SIEMENS 2.2-3.2A SELF-PROTECTED MOTOR STARTER SWITCH 3RV1021-IDA10
SQUARE D 30A 240VAC GENERAL DUTY SAFETY SWITCH D221N SER. E2
MOELLER 250VAC 0.5A 3-POLE ConTACTOR W/ AUX ConTACT DIL EM-10-G W/ 22 DIL EM
AEG POWERBLOCK TRANSISTOR DD 106 N 1600 K
IFM EFECTOR 4-PIN FEMALE ConNECTOR CABLE US/4-DC-P/N-R0L?-PVC-5M/L
CUTLER HAMMER D.C COIL POLE D40RCD *NEW, LOT OF 3*
PETER PAUL ELECTRonICS 120VAC SOLENOID VALVE 22R9DGM
VEEDER-ROOT MINI LX TOTALIZER 799808-312
FUJI ELECTRIC 3-POLE 10A 240VAC CIRCUIT BREAKER BU-ECA3010
PETER PAUL ELECTRonICS 120VAC SOLENOID VALVE 23PK9ZGM
ALLEN BRADLEY 110/115-120VAC COIL SIZE 1 27A STARTER 500F-BOD930 SER B
SMC EXHAUST CLEANER AMC520-04BD
ROXBURGH 200-230V, 10.5A, 50-60HZ 3-PHASE NOISE FILTER SF1252
SMC EXHAUST CLEANER AMC510-06
RELIANCE ELECTRIC AutoMate DIGITAL I/O RAIL 45C1A
HAMMOND 120V TO 24V STEP-DOWN INDUSTRIAL ConTROL TRANSFORMER PH25JG
HUBBELL 20A 125V SAFETY SHROUD TWIST LOCK CORD HBL2311S
PAPST 230VAC, 105/115mA, 50/60Hz COOLING FAN 4656 ZW
MARATHON 600V 100A 3-POLE CLASS R FUSEHOLDER 6R100A3B
VAC CURRENT TRANSFORMER ZKB 464/202-54-151
SIEMENS 3SB36 02-2PA11 HEAVY DUTY SELECTOR SWITCH, NEW
FANUC TRACE PROTECTOR A50B-2301-D020 NNB
GSA TERMINAL BLOCK MODULE USPV6-1
C&K ELECTRonICS 4-POLE DOUBLE THROW ON-ON ROCKER SWITCH 7401 *LOT OF 10*
UNITED ELECTRIC ConTROLS 0-100PSI PRESSURE ConTROL J303F1 / 8026 11482 156
SIEMENS SINUMERIK SIMODRIVE CABLE ASSEMBLY 6SN1161-1CAA00-?0BA1
JOSLYN CLARK ConTROLS 600V MAX HEAVY DUTY PUSHBUTTON 5A10N *NEW*
ALLEN BRADLEY PRE-WIRED FACTORY SEALED LIMIT SWITCH 802M-NX10 SER. F *NEW*
CAPP/USA -40-160 PSI 1/8" NPT PRESSURE GAUGE, NIB
A-H&H 250VDC 600VAC 20-30A POWER-LOCK
NUMATICS 24VDC 4.0W SOLENOID COIL, 236-283B
BANNER 10-30VDC HIGH POWER FIBER OPTIC SENSOR D12SN6FPH
WESTINGHOUSE SINGLE-POLE 20A CIRCUIT BREAKER EHB1020 *LOT OF 3*
ADALET PLM 2-7/8" NPT ARMORED CABLE CONNECTOR, JAG-250
SIEMENS 10-30VDC 4-PIN INDUCTIVE PROXIMITY SWITCH BERO 3 RG 4638-3AG01
BANNER MINI-BEAM 10-30VDC 4 PIN PHOTOELECTRIC SENSOR SM312WQD
BANNER 5 PIN SELF CHECKING BUTTON STBVR8
IDEC 0.5A 250V SAFETY DOOR LOCK SWITCH HS5E-F7Y
SIEMENS 24V GREEN ILLUMINATED PUSHBUTTON 3SB36 390AB71 *NEW*
SIEMENS KEYED SELECTOR SWITCH 3SB3 000-4BD01 *NEW*
EBM PAPST 18/17W 115V 126x126x38mm FAN W2K121-AA15-13
SICK 12-24VDC 4-PIN PHOTOSWITCH PROXIMITY SENSOR VL180-P430 *NEW*
GS HEVI-DUTY TYPE SBE INDUSTRIAL ConTROL TRANSFORMER E095
OMRON 24-240VAC / 12-240VDC PHOTOELECTRIC SENSOR E3JM-R4M4-G
" />
