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PNP是指当有信号触发时，信号输出线out和0v线连接，相当于输出低电平，ov。
对于PNP-NO型，在没有信号触发时，输出线是悬空的，就是0v线和out线断开。有信号触发时，发出与OV相同的电压，也就是out线和0V线连接，输出输出低电平OV。
对于PNP-NC型，在没有信号触发时，发出与0V线相同的电压，也就是out线和0V线连接，输出低电平0V。当有信号触发后，输出线是悬空的，就是0V线和out线断开。
对于PNP-NC+NO型，和NPN-NC+NO型类似，多出一个输出线OUT，及两条信号反相的输出线，根据需要取舍。
我们一般常用的是NPN型，即高电平有效状态。PNP很少使用。
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订单配送查询 BOSTON GEAR 730385-019 1-1/2IN COMPRESSION SPRING CLUTCH PART D382618
9795767-2GR1 11-1/8IN OD 3-1/8IN BORE BRASS PUMP IMPELLER D409142
SMC 00774J23258 KQ2T06-00A SET OF 6 1/4IN UNIOn TEE FITTINGS D505154
FISHER 1L3783 IL3783 BELLOWS BRASS REPLACEMENT PART D341426
PRICE PUMP 1019 PUMP REPAIR KIT D474327
KIM 49677 STEEL SHAFT D338429
BOSTON GEAR PA3212Y-P 1/2IN BORE BEVEL IDLER GEAR D371180
NUMATICS 209-263 SLEEVE ASSEMBLY SOLENOID VALVE REPLACEMENT PART D222649
INGERSOLL RAND 30305726 2-3/4IN ConNECTING ROD BUSHING CYLINDER D398514
PAAL 58015.083 1/2IN BORE BEVEL GEAR REPLACEMENT PART D394192
CARBORUNDUM GC60-H11-VR SET OF 2 7X1X1-1/4IN GRINDING WHEEL D407083
COMPRESSOR SUCTION SEAT 4-7/8 IN DIA. REPLACEMENT PART D452365
M-24987-066 6 IN OD X 4.25 IN ID X 0.50 IN THICK RUBBER WASHER D404925
SMC SV3000-52U-1A-N?11 EDGE SLEEVE LINE ENDPLATE REPLACEMENT PART D422652
RA JonES 603 RED ROLLER 1-1/2IN ID ConVEYOR REPLACEMENT PART D229588
FISHER 16A7908X012 VALVE STEM 1-1/2IN TYPE 92E REPLACEMENT PART D302635
BURKS 21942-P 1-1/8 IN MECHANICAL STAINLESS PUMP SEAL D415567
FISHER 1N5882-000A2 STAINLESS STEM & STEEL PLUG ASSEMBLY D489896
5331 14.62X1.12IN STEEL SHAFT D405524
MAC DAAP-1DA SOLENOID VALVE COIL 120V-AC D223184
42B/229S6 74TOOTH 1-1/4IN BORE GEAR REPLACEMENT PART D341256
MARTIN TS2080 5/8IN BORE STEEL SPUR GEAR D503883
METSO STAD004137 14-1/2 IN OD DIAPHRAGM ACTUATOR REPLACEMENT PART B436355
G&H 96111992137 VALVE O-RING EPDM REPLACEMENT PART D303572
FOSTER 50MPS QUICK DISConNECT PLUG STAINLESS FITTING 1/2 IN NPT D211503
CHESTERTON 010334 1 X 2 X 0.5 PUMP PACKING RING GRAPHITE D477207
TRD EN-AC437-X1 ROD ALIGNING COUPLER D385705
BELOIT 2DF16509-SPL1 PALM GUIDE VALVE STAINLESS REPLACEMENT PART B436588
ALFA LAL 31353-0378-1 VALVE STEM 5-1/2 IN LONG TOTAL 2-13/16IN OD D437155
CUSTOM GASKETS H00120 JUMBO SIZE H 8 X 8 IN 2-1/2 IN BOLT SHIM PART B493452
TYCO DB18M/S REPAIR KIT DIAPHRAGM VALVE REPLACEMENT PART B447038
SIEMENS SQM50.461R1G3R 4-20MA 110-120V-AC REVERSING ACTUATOR B380879
R8C1D7 17-7/8X1IN STAINLESS GEAR DRIVE SHAFT D416382
NELES JAMESBURY IMO-1 RKA46 2IN BALL VALVE REPLACEMENT PART B418310
SPIRALTRAC FI4250RS5500 ENVIRO SEAL 4-1/4X5-1/2IN SEAL GRAPHITE PART B217256
SMC E300-N03 MODULAR PIPING ADAPTOR 3/8IN NPT D503043
ASCO 64-982-3 COIL 460V-AC SOLENOID VALVE REPLACEMENT PART D303147
BOND 6P30TL BRASS 1-1/4IN ID GEAR REPLACEMENT PART D340462
DOUGLAS MACHINE F207283 33-7/8X2-1/4IN SMOOTH STEEL ROLLER ConVEYOR D335016
JOHN CRANE 6IN SWING GATE SEAT STEEL CHECK VALVE D485720
FISHER 16A7846X012 VALVE STEM REPLACEMENT PART D302642
RA JonES 408688 STAINLESS 18-1/2X1-3/8X1-?1/8IN SHAFT D296245
LAYNE BOWLER PUMP CUTLAS BEARING 1-11/16X2-15/32?X3-17/32IN D401993
GARDNER DENVER 900891073800 SHIM SET D407185
11/16IN HEX SHAFT 14-7/16X2-1/2IN ROLLER ConVEYOR D434577
CASHIN 1026-6052 12-5/8IN LENGTH 1-1/4IN OD ConVEYOR ROLLER D212773
MARTIN C1096 14-1/2 DEGREES ANGLE 7/8 IN SPUR GEAR REPLACEMENT PART B381973
MCGILL BCF-2-SB CAM FOLLOWER REPLACEMENT PART D301942
LIMITORQUE 60-426-0044-1 STEEL VALVE HANDWHEEL 37TOOTH SPUR GEAR D489748
SHANKLIN P-B116B 5/8IN SHAFT 24X2IN ROLLER W/ SPROCKET ConVEYOR D438719
PIAB 0100488 2800016 ConNECTION KIT VACUUM SWITCH 1/8IN NPT D403880
60-410-0037-2 BRASS 105MM ID 5-3/4 IN OD WORM GEAR D452694
ALVEY 9350173 PIVOT PIN 7-3/4X3/4IN ConVEYOR REPLACEMENT PART D290586
STEEL 15IN LENGTH 1IN OD KEYWAY SHAFT REPLACEMENT PART D360443
PRICE PUMP 298T 7/8 IN BORE STAINLESS PUMP IMPELLER REPLACEMENT PART B485976