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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Allen Bradley 700-HK32A1 120 VAC Pilot Relay w/ Base 700HK32A1 700 (Lot of 2)
Allen Bradley 700HK36A24L SER.A **GENUINE** AB 700 HK36A2 4L LOT OF 3
ALLEN BRADLEY 700-N5 SER.D*
ALLEN BRADLEY 700-N5 SER.D*
ALLEN BRADLEY 700-P400A1 SER D & CONTACTOR
Allen Bradley 8 Slot BOARD 960188-01A
ALLEN BRADLEY 8000-GD B CIRCUIT BOARD 900018 REV 4 8000GDB
ALLEN BRADLEY 8000-GD B CIRCUIT BOARD 900018 REV 4 8000GDB
Allen Bradley 8000KACA Communication Board 900034
Allen Bradley 8000KACA Communication Board 900034
Allen Bradley 8000-MBAZ 8000MBAZ Not in Box
ALLEN BRADLEY 800H-PRML16R RED PUSH-TO-TEST PILOT LIGHT 120V SERIES F NIB
Allen Bradley 800H-QRBH24G Green Push Button 800HQRBH24G Series F
Allen Bradley 800T Green Pushbutton 800T-A
Allen Bradley 800T Oiltight Pilot Control Unit 800T-FJ16AP
Allen Bradley 800T- Red Push Button w/ Hoffman
Allen Bradley 800T-16HA2KB6AX Ser U GREEN Illuminated Selector 800T-N326 A
Allen Bradley 800T-A Series T Push buttons Type 4, 13 800TA (Lot of 2)
Allen Bradley 800T-A6D2 Ser T Flush Head Red Momentary Red Push Button -
Allen Bradley 800T-B BLACKPUSH BUTTON
Allen Bradley 800T-B2A Push Button Extended Head Black Series T
Allen Bradley 800T-B2A Push Button Extended Head Black Series T
Allen Bradley 800T-B2A Push Button Extended Head Black Series T
Allen Bradley 800T-D Mushroom Head Stop Button
Allen Bradley 800T-D Mushroom Head Stop Button
Allen Bradley 800T-D red mushroom head push button
ALLEN BRADLEY 800T-FXQ24 A1 Red Illum. 24 V AC/DC Push Pull Stop 800T FXQ24
Allen Bradley 800T-FXTQH24RD4 Illuminated Push-pull 30mm Button
ALLEN BRADLEY 800T-H31 SER. T SWITCH
Allen Bradley 800T-J2 3 Position Selector Switch Ser T
ALLEN BRADLEY 800T-N156 Ser B LOCKING COVER FOR PUSHBUTTON ( IN BOX)
ALLEN BRADLEY 800T-N245 800TN245 SER A
Allen Bradley 800T-N246B Mushroom Button, SER A
Allen Bradley 800T-P16W or 800TP16W Pilot Light White
Allen Bradley 800T-PA16 Series T, Green & Red Illuminated Push Button (LOT OF 2)
Allen Bradley 800T-PB16 SER. T ORANGE
Allen Bradley 800T-PS16R Series T pilot light RED
ALLEN BRADLEY 800T-PS16R SMALL RED PILOT LIGHT DUAL INPUT DIODE 120V SER N NIB
ALLEN BRADLEY 800T-PSDT16B SER T Small Pilot Light 800T-PSDT16B SER T
ALLEN BRADLEY 800T-PST16 SER N Small Pilot Light 800T-PST16 SER N
ALLEN BRADLEY 800T-PT16 (SER N) ILLUMINATED RED PUSH BUTTON SWITCH
ALLEN BRADLEY 800T-PT16 (SER N) ILLUMINATED RED PUSH BUTTON SWITCH
ALLEN BRADLEY 800T-PT16 ILLUMINATED RED PUSH BUTTON SWITCH
ALLEN BRADLEY 800T-PT16 SER. T GREEN ILL PUSH TO TEST RED
ALLEN BRADLEY 800T-PT16R ILL PUSH TO TEST RED
Allen Bradley 800T-PT16W Pilot Light 800TPT16W White Cap - No Box
Allen Bradley 800T-QBH10G 800TQBH10G Ser T Illuminated Push Button Green LED 120
ALLEN BRADLEY 800T-QBH24G 24V GREEN ILLIUMINATED PUSHBUTTON SER T
ALLEN BRADLEY 800T-QST24 SER. N PILOT LIGHTS 24VDC, RED, 800TQST24, Lot of 5
Allen Bradley 800T-QT24 Lighted Green Push to Test 24V Push Button
ALLEN BRADLEY 800T-X559 BLACK/GRAY PUSH BUTTON LEGEN PLATE NSFP
ALLEN BRADLEY 802G-GP GRAVITY RETURN LIMIT SWITCH 120V SERIES G
Allen Bradley 802M-DX 802MDX Limit Switch Operating Head Series B
Allen Bradley 802M-K1X 802MK1X Limit Switch Operating Head Series B
Allen Bradley 802M-K1X 802MK1X Limit Switch Operating Head Series B
ALLEN BRADLEY 817-E2 THERMISTOR PROTECTION RELAY 24-240VAC/DC 1.5VA 50-60Hz
ALLEN BRADLEY 845D-SJGL25AGCW4 SERIES B ABSOLUTE ENCODER
ALLEN BRADLEY 845D-SJGL25AGCW4 SERIES B ABSOLUTE ENCODER
ALLEN BRADLEY 855T-B24TL5, SERIES C, STACK LIGHT AMBER STEADY LED
ALLEN BRADLEY 855T-BCB SERIES B BLACK SURFACE MOUNT BASE 1/2 IN NPT
ALLEN BRADLEY 875CP-D8NP18-P3 SER A
Allen Bradley 889D-F3AC-5 3-Pin DC Micro Cordset / 5Meter /STRAIGHT
Allen Bradley 889D-F3AC-5 3-Pin DC Micro Cordset / 5Meter /STRAIGHT
ALLEN BRADLEY 900059 PC BOARD ()
Allen Bradley 960100 rev-2 Circuit Board
Allen Bradley 960152-01FT30 Slot Rack Board 16-Slot
Allen Bradley A-B 1492-H Terminal Block 500V (Lot of 7)
Allen Bradley A-B 149-H Terminal Block 500V(Lot of14)
Allen Bradley A-B 149-H Terminal Block 500V(Lot of14)
ALLEN BRADLEY AB 1777-OA AC OUTPUT BOARD MODULE 120VAC
ALLEN BRADLEY AB 1777-OA AC OUTPUT BOARD MODULE 120VAC
ALLEN BRADLEY AB 2090-U3CBB-DM12 Series A
Allen Bradley A-B 509-A0J600 VAC 509-AAJ " HAS A DENT, SCREW HAS RUST ON IT"
Allen Bradley AB 800T-XD2 Emergency Stop Switch 600V
ALLEN BRADLEY AB PLC 1777-IA AC INPUT BOARD MODULE 120VAC
ALLEN BRADLEY AB PLC 1777-IA AC INPUT BOARD MODULE 120VAC
ALLEN BRADLEY AB PLC 1777-IA AC INPUT BOARD MODULE 120VAC
Allen Bradley AB Rockwell 1771-WA swing arm
Allen Bradley AC drive 1336-B007-EOD-L3
ALLEN BRADLEY AC DRIVE 1336S-A007-AN-EN4--L6 SERIOUS D MISSING COMTROL PROMGRAME
ALLEN BRADLEY AC DRIVE 1336S-A007-AN-EN4--L6 SERIOUS D MISSING COMTROL PROMGRAME
Allen Bradley AC drive 1336S-BRF30-AN-EN-HA2
Allen Bradley AC drive 1336S-BRF30-AN-EN-HAP-L6
ALLEN BRADLEY AC RELAY, 700-N800A1, TYPE N, SERIES C, 120/110 VOLTS (Lot of 2)
Allen Bradley AdaptaScan, Accu-Sort, #2755-PW46, SER-A, wall mount supply
Allen Bradley AdaptaScan, Accu-Sort, #2755-PW46, SER-A, wall mount supply
ALLEN BRADLEY ADJUSTABLE FREQUENCY AC MOTOR DRIVE 1333-EAA