描述
(4)來自信號(hào)線引入的干擾
與PLC控制系統(tǒng)連接的各類信號(hào)傳輸線，除了傳輸有效的各類信號(hào)之外，總會(huì)有外部干擾信號(hào)侵入。此干擾主要有兩種途徑：一是通過變送器或共用信號(hào)儀表的供電電源串入的電網(wǎng)干擾，這往往被忽略；二是信號(hào)線受空間電磁輻射感應(yīng)的干擾，即信號(hào)線上的外部感應(yīng)干擾，這是很嚴(yán)重的。由信號(hào)引入干擾會(huì)引起I/O信號(hào)工作異常和測量精度大大降低，嚴(yán)重時(shí)將引起元器件損傷。對(duì)于隔離性能差的系統(tǒng)，還將導(dǎo)致信號(hào)間互相干擾，引起共地系統(tǒng)總線回流，造成邏輯數(shù)據(jù)變化、誤動(dòng)和死機(jī)。PLC控制系統(tǒng)因信號(hào)引入干擾造成I/O模件損壞數(shù)相當(dāng)嚴(yán)重，由此引起系統(tǒng)故障的情況也很多。
（5）來自接地系統(tǒng)混亂時(shí)的干擾
接地是提高電子設(shè)備電磁兼容性（EMC）的有效手段之一。正確的接地，既能抑制電磁干擾的影響，又能抑制設(shè)備向外發(fā)出干擾；而錯(cuò)誤的接地，反而會(huì)引入嚴(yán)重的干擾信號(hào)，使PLC系統(tǒng)將無法正常工作。PLC控制系統(tǒng)的地線包括系統(tǒng)地、屏蔽地、交流地和保護(hù)地等。接地系統(tǒng)混亂對(duì)PLC系統(tǒng)的干擾主要是各個(gè)接地點(diǎn)電位分布不均，不同接地點(diǎn)間存在地電位差，引起地環(huán)路電流，影響系統(tǒng)正常工作。例如電纜屏蔽層必須一點(diǎn)接地，如果電纜屏蔽層兩端A、B都接地，就存在地電位差，有電流流過屏蔽層，當(dāng)發(fā)生異常狀態(tài)加雷擊時(shí)，地線電流將更大。
此外，屏蔽層、接地線和大地有可能構(gòu)成閉合環(huán)路，在變化磁場的作用下，屏蔽層內(nèi)有會(huì)出現(xiàn)感應(yīng)電流，通過屏蔽層與芯線之間的耦合，干擾信號(hào)回路。若系統(tǒng)地與其它接地處理混亂，所產(chǎn)生的地環(huán)流可能在地線上產(chǎn)生不等電位分布，影響PLC內(nèi)邏輯電路和模擬電路的正常工作。PLC工作的邏輯電壓干擾容限較低，邏輯地電位的分布干擾容易影響PLC的邏輯運(yùn)算和數(shù)據(jù)存儲(chǔ)，造成數(shù)據(jù)混亂、程序跑飛或死機(jī)。模擬地電位的分布將導(dǎo)致測量精度下降，引起對(duì)信號(hào)測控的嚴(yán)重失真和誤動(dòng)作。
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(jì)算機(jī)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(dòng)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(jī)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
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