查找一般PLC故障的步骤是怎样的？
PLC维修时，插好编程器，并将开关拨到RUN位置，再根据下列步骤查找:
1）如果PLC停止在某些输出被激励的位置、状态（地方），一般是处于中间状态，则查找引起下一步操作发生的信号，编程器会显示信号的ON/OFF状态。
2）如果输入信号，将编程器显示的状态与输入模块的LED指示作比较，若结果不一致，则说明需要更换输入模块。更换模块前，需要先检查I/O扩展电缆和相关连接是否正常。
3）如果输入状态与输入模块的LED指示一致，则比较发光二极管与输入装置的状态。如果两者不同，则需要测量一下输入模块。如果发现存在问题，则需要更换I/O装置、现场接线、电源等。否则，需要更换输入模块。
4）如果信号是线圈，没有输出或输出与线圈的状态不同，则需要用编程器检查输出的驱动逻辑，并检查程序清单。
5）如果信号是定时器，并停在小于999.9的非零值上，则需要更换CPU模块。
6）如果该信号控制一个计数器，则需要先检查控制复位的逻辑，再检查计数器信号。然后检查、判断相关组件是否异常，需要更换。
公司主营产品有:AB,ABB,GE,西门子,力士乐，施耐德,福克斯，等工业自动化控制配件及各种停产备件。诚信经营，质量可靠，请放心购买，我们将竭诚为您服务！
Sencon A100-077 VIC 2 Processor Board
Sencon A100-219 PLC Controller Board 89-04937
Sencon A100-46 Power Supply PLC 7.5V 88-02293
Sencon A500-117 PLC 20 Pin Communication Board
Sencon A500-126 Control Relay 12VDC
Sencon A700-234 Output Card A700-234B1
Senett Control S/24/CR2079E Joystick Controller
Senett VV5/CR1856 Joystick Controller
Sensopart FT50RLA-70-PL5 Distance Sensor 30-100mm 18-30VDC
Sensormatic AD2081 Matrix Port Expander
Sensortronics 65016-5K-0104W Load Cell Mount Assembly 5000lbs@3 000mvn
Sensortronics 65059-1K-0102 65023-1K-0113 Load Cell Mount Assy 1000lb 20ft
Sensus Gas Regulator 6-14 W.C Spring with 5/8-10PSI Valve No Box
Sentek EPC00006-001 Isolation Amplifier
Sentran YA6-20KG-000 Load Cell
Sentrol 2804T-M Explosion Proof Magnetic Contact
Sentrol 5885 Shatter Proof Pro Plus Glass Break Sensor
Sequential PS110001 Encoder Shaft Angle Model 11A1024IZE15VH1F1D1B1T
Servo Robot Inc SR9509PIB Pilot 2000 Axis Interconnection Assembly Board
Servo Robot SMART-10 Optical Profiling Laser Sensor
Servo Robot SMART-20LS Optical Profiling Laser Sensor
Servo Robot SR9509SMB Interconnection Assembly Board
Servo Robot SR9607MULControl Board
Servo Robot SR9610CDU Circuit Board
Servo Robot SR9807iso Isolation Board
Servomech ATL05 RN1 C200 ROW FCMNO SP DC Motor 24V 4A with Actuator
Setra C264 Pressure Transducer 24VDC 4-20MA 0-5.0WC
SEW Eurodrive 4603.5 MoviTrac Frequency Inverter Controller 3HP 460VAC
Sew Eurodrive 82.29.54273.8/1 Electric Motor 1700RPM 60HZ 0.5HP
Sew Eurodrive DFT100L48MHR AC Motor 3Hp 230/460V 13.6/6.8A 1680Rpm
Sew Eurodrive DFT80N4BMG1HF Gear Motor 1HP 330/575V 2.58/1.48A 1700RPM
Sew Eurodrive DRE90M4BE2HR/FF-RI Gear Motor 1.5HP 330/575V
Sew Eurodrive DT90L6BMG2HF Brake Gear Motor 230/460V 5.7/2.85A 1120Rpm
Sew Eurodrive FA47DT90S4 Gear Motor 330/575V 3.62/2.08Amp 1700Rpm
Sew Eurodrive KA37DT80K4 Gear Motor 330/575V 2.13/1.22A .75Hp
SEW EuroDrive KAF37DRS7194 Motor 725lb-in 58.60 Ratio 1700RPM
Sew Eurodrive MAS51A010-503-50 Modivyn Servo Drive 10A 700VDC
SEW EuroDrive MAS51A030-503-00 Movidyn Servo Drive 680/700VDC 3Ph
SEW Eurodrive MC07A008-2B1-4-10 Frequency Converter
SEW Eurodrive MC07A040-5A3-4-00 5HP 460V AC Drive
Sew Eurodrive MC07B0008-5A3-4-00 Drive 1 HP 0.75 KW 2.4 Amp IN BOX
SEW Eurodrive MCF41A0040-5A3-4-00 Drive Inverter 9.5Amps 500VAC
SEW Eurodrive MCF41A0040-5A3-4-0T Drive Inverter 500VAC
SEW Eurodrive MCF41A0075-5A3-4-00 MDX60A0075-5A3-4-00 Module
SEW Eurodrive MCF41A0110-5A3-4-00 MDX60A0110-5A3-4-00 Drive
Sew Eurodrive Movitron 114 DC Converter 220V 60Hz
SEW EuroDrive MPR51A015-503-00 Drive 380-500VAC In 550-700VDC Out 50/60Hz
Sew Eurodrive R17DT71D4 Gear Motor 148RPM 0.5HP 330/575V 60Hz 1.39/0.8A
Sew Eurodrive R27DT71D4Z AC Motor 330/575V 1.39/.8Amp .5Hp
Sew Eurodrive R40DT80K4BMG1HF Gear Motor 330/575V 2.13/1.22A .75Hp
SEW EuroDrive R47-DFT71D8/4 Motor 0.14/0.24HP 800/1680RPM 575V 60Hz
Sew Eurodrive R47DT71D4BHG05HF Gear Motor 330/575V 1.39/.8A .5Hp 1700Rpm
Sew Eurodrive RA7DT80N4 Gear Motor 330/575V 2.58/1.48Amp 1700Rpm
Sew Eurodrive RF7DT80N4 MOtor 1HP Gear Reducer 60HZ 1700RPM NOP
SEW EuroDrive S47 DRE80M4 Inverter-Duty Motor 0.75kW 1HP 1740RPM 230/460V
Sew Eurodrive S47DT71C2/BMG/HF/Z Gear Motor .5HP 330/575V 1.17/0.67A
Sew Eurodrive S47DT80K4BMG1HR Gear Motor 230/460V 2.91/1.45A .75Hp
Sew Eurodrive S67/A-H-S Gear Box 65.63
Sew Eurodrive S72DT90S4VS Motor 3.28/1.88A 330/575V
Sew Eurodrive SA37DT80K4 Gear Motor 1700/32.0RPM 0.75HP 330/575V 60Hz
Sew Eurodrive SA37TDT71C4 Gear Motor 31RPM 0.33HP 330/575V 0.92/0.53A
Sew Eurodrive SA47/T Motor and Reducer 1700/59Rpm 0.75/S1Kw 330/575V NOP
Sew Eurodrive SAF37DT71D4 Gear Motor 330/575V 1.39/.80Amp .5Hp 1700Rpm
Sew Eurodrive SAF47DT71D4 Gear Motor 220-240/240-266V 50/60Hz
Sew Eurodrives DFT80K4 Gear Motor 2.90/1.45A .75Hp 1700Rpm
Sew Eurodrives S47DT71D4 Gear Motor 230/460V 2.15/1.07A 0.5Hp 1700Rpm
Sew Eurodrives S47DT80K2 Gear Motor 330/575V 1.18 S3/60Hp 2.85/1.64A
Sew Eurodrives S47DT80N4BMG1HF Gear Motor 230/460V 3.70/1.85A 1Hp
Sew Eurodrives SAF37DT71D4BMG05HF Gear Motor 330/575V 1.39/0.8A 0.5Hp
Sew Eurodrives WA30DT60K6 Gear Motor 230/460V 2.4/1.2A 0.5Hp 1130Rpm
SEW MCLTPA0022-5A3-4-00 Frequency Inverter 380-480V 5.8A 3Phase
SewEuroDrive D16DT80N4 GearMotor 1HP 230/460V 1700RPM 60Hz
Sew-Eurodrive DFT90S4 Motor Gear Reducer 3 Phase 1.5 HP IN BOX
Sew-Eurodrive R47DT711 Gear Motor W/R47A Gear Reducer
Sew-Eurodrive WAF20DT63K4 Motor 240-415V 60Hz 69RPM
Shanghai Rihui A028024 Three Phase Induction Motor 220/380V 3.47/2.01A
Shanghai Rihui Ab-25 90W Q/320621PYB Motor 0.31A 380V 50Hz
Shanghai Rihui YS-7124W Single Phase Induction Motor 550W 1.60A 50Hz
Sharp MX-36NT-YA Yellow Laser Toner Cartridge
Shawmut Amp-Trap 2000 300A 600V AJT300
Shawmut CL800 Fuse 800A 600V Class L
Sheffield/Moore Urigh Cal. 10482 No. 971 Measuring Tool
Shinano Kenshi SDU21E003 Step Motor Driver Board
Sick AWS1-133 Safety Light Curtain Assembly 115/230VAC 50/60Hz
Sick C40E-0601CA010 Safety Light Curtain Standard Receiver Optic
Sick C40E-0901CB010 Light Curtain Receiver 0-6m 24VDC 10W
Sick C40E-1201CB010 Light Curtain Receiver 0-6m 24VDC 10W
Sick C40E-1203CA010 C4000 Light Curtain Receiver 1.2m 30mm Resolution