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1、硬件方面
（1）I／O窜电，PLC自动侦测到I／O错误，进入STOP模式。
（2）I／O损坏，程序运行到需要该I／O的反馈信号，不能向下执行指令。
（3）扩展模块(功能型，如A／D)线路干扰或开路等。
（4）电源部分有干扰或故障。
（5）PLC的连接模块及地址分配模块出故障。
（6）电缆引起的故障。
2、软件方面
（1）触发了死循环。
（2）程序改写了系统参数区的内容，却没有初始化部分。
（3）保护程序启动：硬件保护、限制使用时间(针对货款收回)
（4）数据溢出，步长过大、看门狗 (可修改DOG时间)动作。
SMC 150PSI PNEUMATIC CYLINDER T-ACNL-80-01-00?10US
NUMATICS SOLENOID VALVE I34RD100J053G
PARKER 63mm BORE 120.7mm PNEUMATIC CYLINDER 63 CTMPRVS14MC 120.7
SMC 145PSI PNEUMATIC CYLINDER T-ACNL-80-01-00
NUMATICS 120V, 0.30AMPS, SOLENOID VALVE 554SS43CJ
MAC 150PSI 2.5WATTS SOLENOID VALVE PME591AAAA
TOYODA MACHINE HYDRAULIC CYLINDER HC-40CB215-W-L
SMC PNEUMATIC CYLINDER 63MM BORE 150MM STROKE CKGA163-150Y
NUMATICS DOUBLE ENDED PNEUMATIC REGULATOR NIB 123RQ100JP00000
NUMATICS 150 PSIG SOLENOID VALVE 134BA400KP14D30
NUMATICS SOLENOID REGULATOR VALVE W/ base, I35RD115J000000
WELKER BEARING COMPANY 250PSIG 63MMBORE 50MMSTROKE PNEUMATIC CYLINDER WCP-027
NUMATICS 150PSIG-AIR SOLENOID VALVE I34BB515MP00061
PARKER 14N73-32-32 SAE CODE 61 FLANGE HEAD 90 ELBOW
NUMATICS 120V, 50-60HZ, 0.16AMPS SOLENIOD VALVE 34DXP4460
NUMATICS SERIES ISO5599/11 SOLENOID VALVE I23BB400MP
FESTO 145PSI PNEUMATIC CYLINDER DRQD-25-90-PPV-?J-A-AL-ZW
SMC CYLINDER CDNAF50N-150H-D?-J59W W/CNA50ND-UA
LUBRIQUIP DIVIDER VALVE MSP-151 H006
UNKNOWN MANUFACTURER * SCH 40 PIPE NIPPLE * 304/40
FESTO 32mm BORE 125mm STROKE PNEUMATIC CYLINDER DNG-32-125-PPV-?A
NORGREN 400PSIG INLET 50PSIG OUTLET REGULATOR 11-002-021 103723
FESTO 20MM BORE 25MM STROKE PNEUMATIC CYLINDER, DSNU-20-25-PPV-?A, NNB
FESTO ConNECTOR CABLE, 159424 PNP, NNB
NUMATICS 150 PSIG-AIR PNEUMATIC SOLENOID VALVE, I34BB400KP
HYSON 160 MM STROKE, 130 BAR NITROGEN GAS SPRING NP-750-160 SW
FIBRO GSA 73169 02310 PNEUMATIC ROBOTIC GRIPPER 52.81.500
ST * METRIC 90 ELBOW * UNKNOWN
BIMBA DOUBLE WALL ROD END PNEUMATIC CYLINDER CDW-01828-A-18
RACINE VARIABLE VOLUME SILENT VANE PUMP PSV DNS0 20HRS 11
SMC 145 PSI 1.00 MPA PNEUMATIC CYLINDER, US23700
NUMATICS VALVE 225-285B 24VDC 6.3 WATTS
NUMATICS 120V 0.30A 60HZ 150 PSIG-AIR PNEUMATIC SOLENOID VALVE, I34SS500K
IAI LARGE DIAMETER HOLLOW ROTARY GRIPPER ASSEMBLY
NORGREN GRIP-LOK GRIPPER AW 789 PO
FESTO LINEAR GUIDE FEN-63-200 NNB
UNKNOWN MANUFACTURER * ASSORTED WEATHERHEAD 90 ELBOW * UNKNOWN
NUMATICS REGULATOR VALVE 554RD100J000000
FHAC GX11 HYDRAULIC MOTOR/PUMP 9G D23 01
PALL MODEL 8670 DUPLEX FILTER ASSEMBLY HH8670D20 UB T 104656
NUMATICS 150PSIG, 120V, .16A, 50/60Hz SOLENOID VALVE 554BB500K
ADVANCE * CYLINDER REPAIR KIT NIB * I325-00NL
NORGREN 250PSI PNEUMATIC LUBRICATOR L17-800-OEDA
MAGNETROL PD43L38Y 60W 120V SOLENOID VALVE
HYTORK 1125 ACTUATOR W/ ACCUTRAK POSITIonER 1040N 103548
PARKER 1000KPA SOLENOID VALVE F72VXBG019A
MILLER HEAVY DUTY AIR CYLINDER AV-72BXN -08.00-40.00-01?38-N11-0
