描述

隨著科學(xué)技術(shù)的發(fā)展，PLC在工業(yè)控制中的應(yīng)用越來越廣泛。PLC控制系統(tǒng)的可靠性直接影響到工業(yè)企業(yè)的安全生產(chǎn)和經(jīng)濟(jì)運行，系統(tǒng)的抗干擾能力是關(guān)系到整個系統(tǒng)可靠運行的關(guān)鍵。自動化系統(tǒng)中所使用的各種類型PLC，有的是集中安裝在控制室，有的是安裝在生產(chǎn)現(xiàn)場和各電機設(shè)備上，它們大多處在強電電路和強電設(shè)備所形成的惡劣電磁環(huán)境中。要提高PLC控制系統(tǒng)可靠性，設(shè)計人員只有預(yù)先了解各種干擾才能有效保證系統(tǒng)可靠運行。

2.電磁干擾源及對系統(tǒng)的干擾是什么？

影響PLC控制系統(tǒng)的干擾源于一般影響工業(yè)控制設(shè)備的干擾源一樣，大都產(chǎn)生在電流或電壓劇烈變化的部位，這些電荷劇烈移動的部位就是噪聲源，即干擾源。

干擾類型通常按干擾產(chǎn)生的原因、噪聲的干擾模式和噪聲的波形性質(zhì)的不同劃分。其中：按噪聲產(chǎn)生的原因不同，分為放電噪聲、浪涌噪聲、高頻振蕩噪聲等；按噪聲的波形、性質(zhì)不同，分為持續(xù)噪聲、偶發(fā)噪聲等；按聲音干擾模式不同，分為共模干擾和差模干擾。共模干擾和差模干擾是一種比較常用的分類方法。共模干擾是信號對地面的電位差，主要由電網(wǎng)串入、地電位差及空間電磁輻射在信號線上感應(yīng)的共態(tài)（同方向）電壓送加所形成。共模電壓有時較大，特別是采用隔離性能差的電器供電室，變送器輸出信號的共模電壓普遍較高，有的可高達(dá)130V以上。共模電壓通過不對稱電路可轉(zhuǎn)換成差模電壓，直接影響測控信號，造成元器件損壞（這就是一些系統(tǒng)I/O模件損壞率較高的原因），這種共模干擾可為直流、亦可為交流。差模干擾是指用于信號兩極間得干擾電壓，主要由空間電磁場在信號間耦合感應(yīng)及由不平衡電路轉(zhuǎn)換共模干擾所形成的電壓，這種讓直接疊加在信號上，直接影響測量與控制精度。

歐美品牌停產(chǎn)的，常用的“PLC”備品備件

我司產(chǎn)品應(yīng)用于以下領(lǐng)域：

1,《發(fā)電廠DCS監(jiān)控系統(tǒng)》

2,《智能平鋼化爐系統(tǒng)制造》

3,《PLC可編程輸送控制系統(tǒng)》

4,《DCS集散控制系統(tǒng)》
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5,《智能型消防供水控制系統(tǒng)》

6,《化工廠藥液恒流量計算機控制系統(tǒng)》

7,《電氣控制系統(tǒng)》造紙,印染生產(chǎn)線,變電站綜合自動化控制系列

本特利，英維思，伍德沃德，?？怂共_、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門子、摩托羅拉、GE發(fā)那科、安川、博世力士樂，ACSO，力士樂等各大品牌的DCS系統(tǒng)配件，機器人系統(tǒng)配件，大型伺服系統(tǒng)備件。

SMC SOLENOID SY3120-6LZD-C4(LOT OF 3)

NEMA 34 Planetary Gearhead 518-43-010 Minarik Drives

Panasonic Servo Drive&Motor Set MUDS041A1A

Agilent HP 84000-60189 3.5mm Test Port Cable

SEALEVEL PCI RS-232 RS-422 RS-485 Interface 7202 rev C

OMRON VISION MATE CONTROLLER F350 F350-C10 F300-A20

Olympus WHSZ10X-H/22 Eyepieces

GE Fanuc S2K Servo Drive&MTR-3N31 Servo Motor Set

Interface PCI expansion interface module PCI-2724C 2724

PANTHER H12 Intelligent Motion System IMS

Agilent 11683A RANGE CALIBRATOR WITH OPTION H01

Delta Tau Data Systems PMAC-PC 602705-107 CPU+ram

NAIS M1T MICRO CONTROL UNIT PLC

Soder-Wick 50-4 25ft SIZE#4 QTY=5

Delta Tau Data Systems PMAC Lite 602402-105 602192-103

Delta Tau Data Systems Universal PMAC Lite 602402-105

Coherent FieldMaster Field Master Power Energy Meter

OMEGA DP25-S STRAIN GAUGE METER

FOculus FO442SB IEEE 1394 Digital CCD Firewire Camera

OPTEM 18-108 f/2.5 close 34-11-10 MACRO VIDEO ZOOM LENS

IDEC POWER SUPPLY PS5R-D24 PS5RD24 24VDC 2.1A Qty:3

OPTO 22 SNAP-PS5-24DC SNAP-PS5 SNAP I/O 5V 4Amp QTY:2

QUANTRONIX QS27-4SN-QX1 LIGHTWRITER SPE Q-SWITCH

National Instruments NI PXI-6031E DAQ Board

Agilent 08485-60005 3.5mm(f)-N(m)Adapter 50 MHz

MATROX Meteor II Multi-Channel METEOR2-MC/4

Agilent HP 8765B Coaxial Switch DC-20GHz with Opt 024

Agilent HP 87300C Coaxial Directional Coupler 1-26.5GHz

HP NC364T Quad Port Gigabit Server Adapter 436431-001

PIXERA 001226-001 Rev F PCI CARD

MATROX Meteor II Multi-Channel METEOR2-MC/4

MATROX Meteor II Multi-Channel METEOR2-MC/4/16?F

PARKER COMPUMOTOR SX8 MICROSTEP DRIVE/INDEXER

MATROX METEOR2 CL/32 METEOR Camera Link Frame Grabber

TOTAL CONTROL QPI21100E2P QUICKPANEL 9″TOUCHSCREEN

Magnum ISA Bench Card 000-878004 050-878004 000-868704

Dell Latitude D410 Motherboard&1.6Ghz CPU G8336

Lot of 2 Gore ReadyFlex Microwave Cable Assemblie 18GHz

HUBER-SUHNER SUCOFLEX 104A 8120-4921 Cable 26.5GHz NEW

EDC BIOSYSTEMS LIQUID HANDLING PROCESS CONTROLLER PANEL

TRILLIUM HAND HELD CONTROLLER OT-30 PART#874-5242-01

HP Agilent 1NB7-8539

Agilent HP 08487-60001 2.4mm(f)-N(m)Adapter 50MHz

Agilent 5065-7021

Agilent HP E3614A 0-8VDC 6A DC Power Supply

Agilent 5065-6980

Agilent HP 10498-60001 10498A 8 CH Probe Lead Set

Lot of 3 TAKEX Fiber Optic Sensor FR2-Slim Type

KDI 64537 PQ-1846 Microwave RF Directional Coupler

HP Agilent 1NB7-8539

MITSUBISHI A1SJ71UC24-R2 RS-232-C UNIT NEW

MITSUBISHI A1SY41 OUTPUT MODULE NEW

YAMATAKE HONEYWELL MX100PT12 32PT TRANSISTOR OUT

Allen Bradley 1762-IQ8 MicroLogix DC Input Module QTY=2

Mitsubishi FX2N-80MR-ES/UL FX2N80MRESUL PLC

HITACHI KP-D50 DIGITAL COLOR CAMERA

JVC.TK-C1481BEG?.LO-LUX CCTV COLOUR CAMERA

AVME-311AF AVME 311AF FUJI K2056D

Yamatake Honeywell MX250RV01 VME Interface Board

Texas Instruments 435 Complete PLC

Keyence LS-3101 Laser Scan Micrometer+Scanning Heads

COGNEX VISION SYTEM IN-SIGHT-3400 CAMERA MODULE

FUJI FH1016A VM1440A SIX CHANNEL COMMUNICATION BOARD

FUJI AVAL VME-520 MCIF-16 BOARD CARD

HITACHI ZOSEN HIMV-923A/924A HIMV-924A2 WITH 2M FLASH

Adept Technology 10332-12410 MI-6 VME BOARD STAUBLI

RKC FAREX SRM SR Mini HG SYSTEM

WYKO PCB 619-152 PCI Card

COGNEX 4400 VM13B REV T VISION PROCESSOR MODULE

GE FANUC 90-30 PLC 5 SLOT SYSTEM Stepper Motor

Agilent 20mm Torque Wrench 8710-1764

COGNEX CHECKER 101 807-0007-2 REV A VISION CAMERA

Lot of 2 CrystalFontz 634 CFA-634 LCD Dispaly

National Instruments NI GPIB PCIe PCIe-GPIB

AMD Turion 64 X 2 TL52 1,6 Ghz TMDTL52HAXSCT

Micro-Coax 26GHZ 84 inch Flexible Microwave Cable

NARDA POWER DIVIDER 4456-2 FROM 2.0 to 18 GHz

STORM TRUE BLUE 205 18GHZ 72 inch Flexible CABLE

Galil Motion Controls DB 1004 DAUGHTER BOARD Rev-C

Galil 6-AXIS Motion Controller DMC-1060 DMC1060 Rev G

BERKELEY PROCESS CONTROL BX I/O WITH INPUT&OUTPUT

Agilent 1250-1529 Adapter Type-N(f)to Type-N(f)75

KEYENCE KV-24DR PLC with KV-U2 POWER SUPPLY

Agilent 1250-1476 Adapter Type-N(m)to BNC(f)NEW

HP 44727A 4 Ch Voltage/Current DAC

HP 44705A 20 CHANNEL RELAY MULTIPLEXER

Sorensen DCS80-13E DC Programmable Power Supply

SUNX S link SL-T8J,SL-T16C1 and SL-TP16C1

CORECO PC-CAMLINK PCI UNIQ UP-2000CL CCD DIGITAL CAMERA

JSR Ultrasonics RP-U2 SONIX ECHO remote pulser

NAVITAR 6000 60095 Lens 1-60095 High Mag Zoom

LiNOS 4401-256-000-20 1064nm 2-8X Laser Beam Expander

QUANTRONIX LASER HEAD PUMP CHAMBER

QUANTRONIX 0201-03199 Cavity Assembly

QUANTRONIX SHUTTER Assembly 319 0103-00483 REV G NEW

Cognex In-Sight 5400 Smart Cameras With Cable

Vision Control PSO 90-100/125 deflectors 90 degrees