6AV6648-0AF11-3AX0 這類傳感器一般是三線制的，電源正極V+、電源負(fù)極V-、輸出O，對于NPN型的傳感器來說，在未檢測到信號時，輸出高電平，輸出O與電源V+之間是0v、與電源V-之間是24v，當(dāng)檢測到信號時，輸出O與電源V+之間是24v、與電源V-之間是0v；對于PNP型的傳感器來說則剛好相反，檢測到信號時是高電平輸出。簡單的說NPN檢測到信號時輸出的那根線的電壓是0v（低電平輸出），PNP是24v（高電平輸出）。

知道了這些我們再看下PLC的輸入類型，有漏型和源型輸入的區(qū)別，這里我們說下PLC的輸入X是如何激活的或者X的指示燈是如何點(diǎn)亮的，對于輸入繼電器X來講我們需要一個24v的直流電源去驅(qū)動它才能被激活，因此有正負(fù)極，如果負(fù)極接公共端則是源型輸入，正極接公共端就是漏型輸入。這里再講下公共端是什么，就是所有的X端子的公用的正極或者負(fù)極，不可能X0配有兩個端子輸入，X1也配有兩個端子，這樣太占地方。對于PLC是漏型輸入的，公共端接的是24v，想要X有輸入信號，X就必須接0v（低電平）才能驅(qū)動，同理對于PLC是源型的，公共端接0v，X必須接24v（高電平）才能點(diǎn)亮。因此傳感器的類型和PLC的輸入類型一般要一致的否則不能用，就是漏型輸入的PLC配合NPN型的傳感器，源型輸入的PLC與PNP型傳感器配合使用。當(dāng)然有的PLC多公共端，有漏型、源型輸入通用型的另說。

6AV6648-0AF11-3AX0

MBF POWER SUPPLY MBF 003044

TELKOOR CPCI AC-6U-400 MODULE1756-DHRIOXT
1756-DNB
1756-EN2F
1756-EN2T
1756-EN2TRXT
1756-EN2TSC
1756-EN2TXT
1756-EN3TR
1756-ENBT
1756-ESMCAP
1756-ESMNSE
1756-EWEB
1756-HIST1G
1756-HIST2G
1756-HSC
1756-HYD02
1756-IA16
1756-IA16I
1756-IA32
1756-IA8D
1756-IB16
1756-IB16D
1756-IB16I
1756-IB16IF
1756-IB16ISOE
1756-IB32
1756-IC16
1756-IF16
1756-IF16IH
1756-IF16H
1756-IF4FXOF2F
1756-IF6CIS
1756-IF6I
1756-IF8
1756-IF8H
1756-IF8I
1756-IF8IH
1756-IG16
1756-IH16I
1756-IH16ISOE
1756-IM16I
1756-IN16
1756-IR6I
1756-IT6I
1756-IT6I2
1756-IV16
1756-IV32
1756-L60M03SE
1756-L62S
1756-L71
1756-L71S
1756-L72
1756-L72S
1756-L73
1756-L73S
1756-L73SXT
1756-L74
1756-L75
1756-L7SP
1756-L81E


Siemens K 1400 ISDN NT ANALYZER K1400

Asyst Teach Pendant 8045R2-1-ES-ASYST

MULTILINK MTC21208E-A-I-9230-P-2 MTC21208E

FAST-MK : ME1230-V5-LEO ME1230 V5 LEO NEW

VERTEQ 1600-NSC CONTROLLER 120VAC 15 AMPS 

VERTEQ MCS2600-3 C-E3 UC 120VAC 15 AMPS

BALDOR NEXTMOVE BX II MMX004-501 2 AXIS

ATRICA AT20070 ETHERNET SWITCH AT20070-00-AA

RFPP 7921302010 HARMONIC FILTER

MICRO SYS SB8486 REV J1 W/ MP3861 & SBX-SPIO-00

A.C.S ELECTRONICS SB214PC4-F REV F4 MOTION CONTROLLER

SAGITTA MOTHER BOARD SMP REV 3.1 PCB13094V0

MICRO SYS SB8486 REV J1 W/ MP3861 & SBX-SPIO-00

HP 85044A TRANSMISSION/REF TEST SET 300KHZ - 3.0GHZ

POLESTAR N-10 MRI REMOTE CONTROL 506A0180-01 

POLESTAR MRI REMOTE CONTROL 506A0246-01 

BALDOR MicroFlex 3A AC SERVO DRIVE FMH2A03TR-EN23

OMRON G72C-ID16 REMOTE TERMINAL 24VDC

SQUARE D MG24468 MG 24468 C60N 16A-TYPE C 480Y/277Va-c 

EPSON T603C LIGHT MAGENTA T603C PRO 7800 / 9800 08.2010

LEICA 301-389.030 VME BOARD

RF TUOTE OY TM-6 TV MODULATOR

OMRON SERVO DRIVER R88S-H306G 2700VA

LEICA LFS+Z 2 301-389.040-900 VME BOARD 301-389.040

IBM 24R2126 LTO ULTRIUM3 TAPE DRIVE WITH TRAY

MATROX GENESIS GEN/P/64/8/STD

UNIT UFC-1660 5 SCCM PN: 1660-106346

NIKON 4S015-119 NK386SX4 BLADE 4S015-150 SX4-BT-02S

UNIT UFC-8160 5 SCCM GAS Ne

UNIT UFC-1200 16 SCCM GAS N2

TRANS METRICS P450DVS537 SERIES 400 45A

TRANS METRICS P450DVS536 SERIES 400 3MA

OLYMPUS BX-RLAA Microscope Assembly

EXCELSYS GEN XCD555500 XCD

Intel IXM5414E Blade Server 4-Ports 1000B-T C56082-012

MATROX GENESIS GEN/P/64/8

Intel IXM5414E Blade Server 4-Ports 1000B-T C56082-011 

AirSpan Marconi WipLL SPR 5.8GHz TDD Ext 09000051

AirSpan Marconi WipLL SPR SPR 3.5GHz Int FDD 09000041

AirSpan Marconi WipLL SPR SPR 3.5GHz Int FDD 09000018

SBC PRO-LOG PIP10D P-I 32M MEMORY REV 005

SBC TEKNOR T946S/433_0 CELERON 433 128M 990-164-00

FSC FIRE SENTRY CORP. S7-2175 CONTROL PANEL

MITSUBISHI HC-SF152K-UL AC SERVO MOTOR

PTT 5260 CABLE SIMULATOR 26 AWG

SBC CYCLONE MICROSYSTEMS 270-0912-03 PCI912 W/486 64MB

MATROX HELIOS XCL/ODYSSEY Y7108-03 REV A O10G5MSFCL