do890

do890

1.電源回路

PLC供電一般為AC85-240V(也有DC24V)，適應(yīng)電源范圍較寬，但為了抗干擾，應(yīng)加裝電源凈化元件(如電源濾波器、1：1隔離變壓器等)

2.PLC上DC24V電源的使用

各公司PLC產(chǎn)品上一般都有DC24V電源，但該電源容量小，為幾十毫安至幾百毫安，用其帶負(fù)載時(shí)應(yīng)注意容量，同時(shí)做好防短路措施(因?yàn)樵撾娫吹倪^(guò)載或短路將影響PLC的運(yùn)行)。

3.外部DC24V電源

若輸入回路有DC24V供電的接近開關(guān)、光電開關(guān)等，而PLC上的DC24V電源容量不夠時(shí)，要從外部提供DC24V電源;但該電源的"一"端不要與PLC的DC24V電源的"一"以及"COM"端相連，否則會(huì)影響PLC的運(yùn)行。

4.輸入的靈敏度

各生產(chǎn)廠家對(duì)PLC的輸入電壓和電流都有規(guī)定，當(dāng)輸入元件的輸入電流大于PLC的大輸入電流或有漏電流時(shí)，就會(huì)有誤動(dòng)作，降低靈敏度。所以應(yīng)適用弱電流輸入并對(duì)漏電流采取防護(hù)措施，并且選用輸入為供漏型輸入的PLC。

兩線式傳感器(光電開關(guān)、無(wú)觸點(diǎn)開關(guān))有LED的限位開關(guān)時(shí)，輸入漏電流會(huì)產(chǎn)生錯(cuò)誤輸入或燈亮，對(duì)策為連接泄放電阻降低輸入阻抗，阻值由圖1中公式推導(dǎo)：

HP/Agilent 16532A 1GSa/s Digitizing Oscilloscope; 8K de

HP/Agilent 41421B Source Monitor Unit

HP/Agilent 8924E CDMA Mobile Station Test Set

Exfo IQ-9100-D54 Optical Switch (9100 Fiberoptic Switch

Colby Instruments PG1000A 1MHz to 1000MHz Pulse Generat

Farnell PSG1000B 1 GHz Signal Generator

HP/Agilent 1141A 200MHz Differential Probe

Stanford Research SR280 Mainframe and Display Module

HP/Agilent 34946A-004 Dual 1x2 SPDT Terminated Microwav

California Instruments 959XPT Plug-In

Transistor Devices MCL488-50-100-350 DC Electronic Load

Adtech 400120 Mainframe

Anritsu MA2469A Power Sensor 10MHz-14GHz -60 To +20dBm

Anritsu MP0122A 1.5/45/52M Plug-In

Anritsu MP0121A PDH/SDH Module, 2/8/34/139/156Mb/s

HP/Agilent 37701B-01-V01 T1 Datacom Tester with opt. 01

HP/Agilent 34501M 32-Channel Armature Rly Mux/Matrix

HP/Agilent 34501A 32-Channel Armature Rly Mux/Matrix

HP/Agilent 6621A Dual Output, 0 to 7 Volt, 0 to 10 Amp

HP/Agilent 34502A 32-Channel Reed Relay Mux/Matrix

HP/Agilent 54600B Oscilloscope 2 Channel 100 MHz

HP/Agilent 6622A Dual Output DC Power Supply 20V, 4A or

HP/Agilent 54120B Digitizing Oscilloscope Mainframe

HP/Agilent 6542A single output, 200 W, 6541A-6545A prov

HP/Agilent 6545A-J05 DC Power Supply, 0-120V, 1.5A, w/o

HP/Agilent 6552A Power Supply

HP/Agilent 4261A-001-003 LCR METER

HP/Agilent E4480A Sonet/SDH Test Set, CERJAC DS3 Test s

HP/Agilent E1750A VXI Broadband Distribution Amplifier

HP/Agilent J4227A SpectralBER DWDM Short Reach Rx 2.5Gb

HP/Agilent J4233A SpectralBER DWDM Transmitter

ILX Lightwave LDT5910 Thermoelectric Temperature Contro

Hughes 45752H-1000 WR22 Precision Direct Reading Phase

Hughes 45751H-2000 WR28 Precision Direct Reading Phase

HP/Agilent 85051A Calibration Kit, 7mm, 0.045-18GHz for

HP/Agilent 8903A Audio Analyzer, 20Hz to 100kHz

HP/Agilent 8922P GSM Mobile Station Test Set for Manufa

HP/Agilent 8656B-001-002 Synthesized Signal Generator 0

HP/Agilent E1420B Universal Counter VXI Module

HP/Agilent E1418A 8/16-Ch D/A Converter

HP/Agilent 85060C Electronic Calibration Control Unit

HP/Agilent E1413A 64-CH Scanning A/D Convertor

HP/Agilent 8904A-002-004 Multifunction Synthesizer, dc

Spirent AT9045 SmartBits Series, ATM DS3, 1-port SmartC

Lambda-EMI EMS100-10-Parts units DC Power Supply 0-100V

Tektronix 2246A Analog oscilloscope

Tektronix 11402-2D Digital Oscilloscope Mainframe. 2D-M

Tektronix DSA601A Digitizing Signal Analyzer

Tektronix S-51 Trigger Countdown Head

TRG-Alpha Industries 510U-383 Precision Direct Reading

Tektronix TLA720 Benchtop Logic Analyzer Mainframe

Tektronix TSG300 Component TV Generator

Transistor Devices WCL488-100-1000-12000-Parts DC Elect

Tektronix TLA704 Logic Analyzer Mainframe

TRG-Alpha Industries 510K-595 Direct Reading Attenuator

HP/Agilent E5385A 34-CH Single-ended samtec connector p

Keithley 7999-6 GPIB RF relay unit

ETEK FPCR-1B Programmable Polarization Controller Drive

Adtech 400323 Utopia Interface

JDS Uniphase 5500L Variable Optical Attenuator

Lambda-EMI EMS6-400-2-D DC Power Supply 0-6V, 400A

Amrel PD20-7.5 /New DC Power Supply, 0-20V, 7.5A

HP/Agilent 81536A InGaAs, +3 to -70 dBm, 800 to 1700nm

HP/Agilent 214B PULSE GENERATOR

Keithley 485 Auto Picoammeter

HP/Agilent 5345A-011 Electronic Frequency Counter

HP/Agilent 5385A Frequency Counter 10HZ TO 1GHZ

ILX Lightwave LCM39437 Current Source & TE Controller M

HP/Agilent 6611C Precision DC Power Supply, 0-8V, 5A, 4

Newport ESA-CXA Drive Controller

HP/Agilent E5900B/E3454B Emulation Probe

HP/Agilent E5900B/E3453B/E3497B Emulation Probe

HP/Agilent E5900B/E3463B Emulation Probe

HP/Agilent E5900B/E3452B Emulation Probe

Gigatronics 80401A Modulation Power Sensor, 10MHz to 18

Gnubi EPX200, EXP-200 Quad DS1 TXCVR

Gigatronics 80601A Modulation Power Sensor, 10 MHz to 1

Boonton 92BD RF Millivoltmeter, 4 digit meter, 100uV (-

Exfo FOT-152XA-BR23BLC-58-IE Optical Loss Test Set

Fujikura CT100B, CT-100B High Precision Fiber Cleaver

CDS 73A-357 Relay SPDT

California Instruments 800T Precision Oscillator Module

Clarostat 240C Power Resistor

Exfo IQ-2100 Laser Light Source

Transistor Devices RPL 130-75-1000 Electronic Load DC E

Kepco HSP 48-30 DC Power Supply Module, 9.6V to 59.2V,

PTS 620 Frequency Synthesizer, 1 to 620 MHz

Kepco HSP 48-21 DC Power Supply Module, 33.6 to 60V, 21

Anritsu MA2481B-01 Universal Power Sensor, 10 MHz to 6

Ando AQ2140 Optical Lightwave Multimeter Mainframe, 2-S

HP/Agilent 33120A Function / Arbitrary Waveform Generat

Anritsu 3670V50-2 V-Connector Semi-Rigid Cable, DC to 6

HP/Agilent 35677A S-Parameter Test Set, 100kHz to 200MH

HP/Agilent 5356B Frequency Converter Head for the HP 53

HP/Agilent 5359A Time Synthesizer

HP/Agilent 6033A DC Power Supply 0-20V, 30A; 200W max.

HP/Agilent 54120A 20GHz Digital Oscilloscope

HP/Agilent 34505A 1.3 GHz relay multiplexer for 3235A m

HP/Agilent 34505C 1.3 GHz relay multiplexer for 3235A m

HP/Agilent 34505B 1.3 GHz relay multiplexer for 3235A m

HP/Agilent 8154B-002-014 LED SOURCE 1300nm

HP/Agilent 66101A DC Power Supply Module 0-8V, 16A

HP/Agilent 66312A DC Power Supply, 0-20V, 2A

HP/Agilent 6826A Bipolar Power Supply Amplifier

HP/Agilent 6186C HP / Agilent 6186C Power Supply 300 V

HP/Agilent E1482A VXI Bus Extender

Keithley 619 Electrometer/multimeter, IEEE

Keithley 7002 400-Channel Switch System Mainframe

Keithley 2361 Trigger Controller

JDS Uniphase 5500L (5500L-1.30-LS2C-STD) Variable Optic

JDS Uniphase 5500L (VA5503-NC-L) Variable Optical Atten

JDS Uniphase 5500L (5500L-1.30-LSAC-STD) Variable Optic

HP/Agilent PT500 Stimulus and Response Protocal Analyze

ILX Lightwave LDC3916372 0.5A Current Source / 9W Laser

JDS Uniphase 5500L (5500L-1.30-STD-LBR) Variable Optica

Keithley 7012S 4 X 10 Matrix Module

Keithley 7037D 30 Channel Single Pole Relay Digital I/O

K&L Microwave 3TNF-200-400-5N Tunable Band Reject Filte

ILX Lightwave LDX3207B Precision Current Source, 200mA

HP/Agilent 8900C Analog Peak Power Meter

HP/Agilent 8350B Sweep Oscillator Mainframe

HP/Agilent E1404A VXI Translator Module

HP/Agilent 8656A-001 Synthesized Signal Generator 0.1 t

HP/Agilent 8495K Step Attenuator, DC-26.5GHz, 0-70dB, 1

HP/Agilent 8494G-H90 Programmable Variable Attenuator D

Kikusui PLZ300W Electronic Load; 4-60V, 0-60A, 300W Ma

HP/Agilent 8496B-001std Manually Variable Step Attenuat

HP/Agilent 8496B Manually Variable Step Attenuator, DC-

Narda 4426-2 Power Divider, 2-Way, 500 MHz to 18 GHz

Krohn-Hite 3323 Dual Channel Tunable Filter, 0.01 Hz to

HP/Agilent 87106A-100-T24 SP6T, DC to 4GHz Multiport RF

Sorensen DCS60-18 DC Power Supply 0-60V, 0-18A