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1746-RT25C

3所采用的可靠性措施
 針對(duì)工作環(huán)境對(duì)PLC系統(tǒng)的各種影響，可以采取以下相應(yīng)措施以保證系統(tǒng)的可靠性。
3.1屏體選用屏蔽性能良好的結(jié)構(gòu)，以保證外部電磁干擾不在屏內(nèi)部產(chǎn)生感應(yīng)電壓和感應(yīng)電流。
3.2開入端選用光電隔離端子。外部開入信號(hào)的電壓等級(jí)為DC220V，增強(qiáng)抗干擾性能；內(nèi)部因?yàn)闆]有什么強(qiáng)電磁干擾，開入信號(hào)電壓仍選DC24V工作。光電隔離端子輸入側(cè)和輸出側(cè)的絕緣電阻很高，一般為1012～1013Ω，而分布電容值很小，一般僅為0.5～1pF，從而輸入側(cè)的干擾很難通過；光電隔離端子中信息的傳送介質(zhì)為光，而信息的轉(zhuǎn)換與傳送過程是在不透明的密閉環(huán)境中進(jìn)行的，從而不受通常的電磁信號(hào)和外界光的干擾。光電隔離端子不僅增加抗干擾性能，還能避免由開入端來的強(qiáng)干擾損壞屏內(nèi)元器件。
3.3開出選用開關(guān)量輸出端子。為避免開出端的干擾對(duì)PLC造成沖擊，甚至對(duì)PLC系統(tǒng)造成損壞，應(yīng)使用出口繼電器，并選用開出量端子。PLC輸出模塊內(nèi)的小型繼電器的觸點(diǎn)很小，斷弧能力很差，不能直接用于發(fā)電站的DC 220V電路中，必須用PLC驅(qū)動(dòng)外部繼電器，用外部繼電器的觸點(diǎn)驅(qū)動(dòng)DC 220V的負(fù)載。PLC系統(tǒng)只通過出口繼電器的空接點(diǎn)對(duì)電站控制回路進(jìn)行操作。對(duì)于屏內(nèi)的信號(hào)燈、光字牌等工作電壓為DC24V的負(fù)載可以用PLC輸出模塊內(nèi)的小型繼電器直接驅(qū)動(dòng)。

◆ 企業(yè)名稱：廈門泰尼電氣有限公司

◆ 企業(yè)性質(zhì)：有限責(zé)任公司

◆ 主營(yíng)業(yè)務(wù)：DCS,PLC

◆ 經(jīng)營(yíng)模式：貿(mào)易

◆ 貿(mào)易地區(qū)：全國(guó)

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◆ 郵政編碼： 361026

KINNEY KTC-21 VACUUM PUMP NICE

FISHER TYPE 667 SIZE 30 ACTUATOR EZ SIZE 1 BODY WCB

BIO-RAD I CYCLER THERMAL CYCLER

SIEMENS MIDI MASTER 10HP VARIABLE DRIVE 6SE3121-7DG

CANBERRA ICB HVPS 9645 NIM BIN MODULE HIGH VOLTAGE

CANBERRA ADC 9635 NM BIN MODULE EXCELLENT CONDITION

HP Agilent G1512A Autosampler Controller

Leybold D60A Trivac Rotary Vane Dual Stage Pump

Olympus BH-2 MICROSCOPE W/ OBJECTIVES SPLAN FL2 DPLAN

Olympus BH-2 MICROSCOPE W/ OBJECTIVES DUAL HEAD BHTU

VARIAN M6 DIFFUSION PUMP

BIO-RAD HPLC GRADIENT SYSTEM HPLC INTERFACE 5201 PUMPS

Olympus CLV-U40 Xenon Light Source CLV U40 CLVU40 Edosc

Agilent / HP 4145A - Semiconductor Parameter Analyzer D

HARVARD APPARATUS 2000 INFUSION LAB PUMP

Millipore Waters 410 Differential Refractometer Detecto

Milwaukee 4203 Mag Drill Base and 4297-1 Drill Motor

NICE MILLIPORE MILLI-Q BIOCEL WATER PURIFIER

Vision Engineering MANTIS Stereo Microscope WITH STAND

NICE REXEL X16 DESTROYER PAPER SHREDDER NICE HEAVY DUTY

TOPCON ET-1 TOTAL STATION DEGITAL WITH POWER SUPPLY

T1S 24"X43" 12V DIAMOND BRITE ELECTRONIC DISPLAY WITH C

VACU-FILL GETZ MANUFACTURING SVI-100-PR FIRE EXTINGUISH

GATAN PRECISION ION MILLING MACHINE WITH CHAMBER

HUGE BRISTOL COMPRESSOR H2NG H2NG124DPEE

MALVERN PCS100SM SUB-MICRON PARTICLE ANALYZER

Cadwell Excell EMG Unit Electromyogram 386SX

NICE GS GENERAL SCANNING 1000

DEVILBISS STAINLESS STEEL QMS PAINT PRESSURE TANK 15" D

EUROCLEAN UZ948 115V INDUSTRIAL VACUUM NICE

Enerpac Hydraulic Pump POWER PACK PES3022 1 1/2HP 115V

ADR Pioneer Air Systems ADR-40A REFRIGERATED Compresse

EDA WORKING LEVEL MONITOR WLM-30 RADON

LINEAR SLIDE PACIFIC BENNING 30 1/2" 9X9" PERFECT

TRACEDEC CONTACTLESS CONDUCTIVITY DETECTOR

LANG 12" BY 24" GRIDDLE GOOD CONDITION

TRANE 21" BLOWER 7.5HP 460V

MICRO MOTION ELITE REMOTE FLOW TRANSMITTER RFT9739E4SUJ

Datex-Ohmeda flat panel video monitor

Dionex LC20 Chromatography Enclosure

HITACHI MEDICAL EUB-420 ULTRASOUND MACHINE

CECIL CE 2041 SPECTROMETER

TT SERIES MICROMANOMETER DP MEASUREMENT BUCKINGHAM

WOCESTER 316SS 3 WAY STAINLESS BALL VALVE 3" CLASS

MARATHON 9VD254TFNA6515BAL 230/460V 15HP 3550RPM EL

MARATHON FVA254TTFNA6501BBL 15HP 3550 RPM ELECTRIC

ROBERTSHAW ACTUATOR 4402-C4-C1-A2 1" ACTUATOR

PERKIN ELMER HS 40XL HEADSPACE SAMPLER

PACIFIC VALVE D1400 2" ACTUATED VALVE

CHROMALOX HEATER 174797-01

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FISHER TYPE Y 1 3/16" Y692VBM VALVE

GE MAGNE BLAST CIRCUIT BREAKER KK-6178482G7

DoAll DBW-8CG Blade Welder WITH GRINDER 440V

Ridgid 141 Receding Geared Pipe Threader Die Head

Abbott Labs Cell-Dyn 3500 Hematology Analyzer

VARIAN SENTORR L91103010000 DIGITAL GAUGE CONTROL

EBERLINE BETA COUNTER BC-4

IEC Centra CLD Centrifuge WORKING

PERKIN ELMER FT-IR MICROSCOPE GSWH30X/7 EYE PIECES

SKIDMORE VJS-402 CONDENSATE BOILER FEED PUMP 1 1/2H

SANDPIPER WARREN RUPP SBI SGN 4HC AIR POWERED PUMP

LABLINE 3525 INCUBATOR SHAKER

SPEX Sample Prep 6750 Freezer/ Mill Cryogenic Impact Gr

FORMA SCIENTIFIC 923 -86 FREEZER

GE 2259212 LA39 Ultrasound Probe Transducer

GE 2197488 LA39 Ultrasound Probe Transducer

GE E721 TRANSDUCER PROBE ULTRASOUND 6.6/D5.0MHZ

ROCKWELL MARPAC ACTUATOR VALVE 9R4120 VALVE 3"

DEVILBISS 44643 AIR COMPRESSOR HEAD

BRAY SERIES 70 2ND GENERATION ELECTRIC ACTUATOR 3"

WILKS FOXBORO 80 SPECTROMETER

V BLENDER MIXER CONTAINER STAINLESS STEEL

ACORTO 990 ESPRESSO MACHINE

ORIEL 68810 ARC LAMP POWER SUPPLY 200-500 WATT HG

LEYBOLD VACUUM CHAMBER 8" FLANGE 18" TALL NICE

GE P9603MB MTZ 6.5MHZ ULTRASOUND PROBE TRANSDUCER

ESAOTE BIOMEDICAL CAII 3.5MHZ 960 ULTRASOUND TRANSDUCER

GE P9603MB MTZ 6.5MHZ ULTRASOUND PROBE TRANSDUCER

GE ULTRASOUND TRANSDUCER PROBE 2147964 M3C

GE ULTRASOUND PROBE TRANSDUCER P9607AD C551

GRAPHO METRONIC LITHOMETER 117V

SYNERGISTIC E180E CONTROL PORTABLE SURVEY METER C180-XP

CARVER LABORATORY PRESS MODEL C NICE

VARIDYNE MOTOR INVERTER 20HP NICE

GE 3.8MHZ 3CB 2247825 ULTRASOUND TRANSDUCER PROBE

GE 2197488 227S ULTRASOUND PROBE TRANSDUCER

GE ULTRASOUND PROBE TRANSDUCER 7L 2302648

HITACHI L-7200 SYSTEM autosampler MD ADVANTAGE MDA-400

TRIATEK ISOLATION MONITOR 1600 WITH CONTROL

Olympus Endoscope A5207 9" 5 degree SCOPE

RELLE ENGINEERING 3130 MICROPHONE DUAL TONED MK 38 XDUC

HAMMEL DAHL KOSO 3/4" 316SS VALVE NELES JA,EBURY G

CTI 8031-112 HELIX COLD HEAD COMPRESSOR CRYOGENICS

WORKING GENETAC HYBRIDIZATION STATION PERFECT

SQUARE D ALTIVAR AB SPL 51139-300-01H MOTOR CONTROL

PRINCETON MICROMAX DETECTOR ST-133

STANFORD RESEARCH SR360 16 CHANNEL THERMOCOUPLE MONITOR

NIKON LABOPHOT MICROSCOPE W/ NIKON CFW 10X EYE PIECES O

ANALOG WAY OCTO-LOG HI-RES LOGO INSERTER OLG802

Vision Engineering Macro Dynascope Model - 5D UNIVERSAL

Vision Engineering BETA MICROSCOPE

PolyScience Recirculator Chiller 5306

300 SWAGELOK FERRELE 0.440 & 400 BACK FERRELE 714-1-316

ALLEN BRADLEY 1400-PD52A POWER MONITOR

WATERS 600S CONTROLLER WITH 626 PUMP VERY NICE

FOXBORO MIRAN 1B2 PORTABLE SPECTROMETER W/CHARGER

BIO-RAD BIOFOCUS CAPILLARY ELECTROPHORESIS SYSTEM

Elga Medica Water Purification System MEDICA 60

DANFOSS VLT 6000 HVAC VLT DRIVE LARGE

ENRAF PRECISE LEVEL TRANSMITTER UEAN-854 M21F20/LCZ

HP/Agilent SEPTUM PURGE G1544-60710

DEWAR 3K DISPENSING SYSTEM SIEMENS LOADED

HP 5890 II GAS CHROMATOGRAPH

GROEN GENERATION 3 STEAMER GG3-S

FURNAS VEEARC DRIVE MOTOR CONTROL 60HP SUPER 70000

NICE VARIAN DIFFUSTION PUMP 0183A/UHS-4

HP 5890 SERIES II GAS CHROMATOGRAPH

AMERICAN LASER CORPORATION ARGON LASER ALC-60X

PACO CENTRIFUGAL PUMP BOILER 3BB-KB 7.5HP 375GPM

FURNAS VEEARC ADJUSTABLE FREQUENCY DRIVE VERARC 7000+

Whatman 75-34 Hydrogen Generator

MQ1001 TOC ANALYZER MQ SCIENTIFIC

Parker-Balston Hydrogen Generator

AMTI BIOMECHANICS ADVANCED MECHANICAL TECHNOLOGY SGA6-3

STALKER RADAR GUN ATP NICE


3.4對(duì)于通訊部分，為提高其抗干擾性能，選用適合強(qiáng)干擾的工業(yè)環(huán)境的現(xiàn)場(chǎng)總線方式，通信介質(zhì)選用屏蔽電纜。在實(shí)際應(yīng)用中我們選用CAN總線方式。CAN采用短幀結(jié)構(gòu)傳輸，每幀有效字節(jié)為8個(gè)，傳輸時(shí)間短，受干擾的概率低。而且每幀信息都有CRC校驗(yàn)和其他檢錯(cuò)措施，保證數(shù)據(jù)出錯(cuò)率極低。當(dāng)節(jié)點(diǎn)嚴(yán)重錯(cuò)誤時(shí)，具有自動(dòng)關(guān)閉功能，使總線上其他節(jié)點(diǎn)不受影響。CAN總線是水電站等強(qiáng)干擾工業(yè)環(huán)境。實(shí)際運(yùn)行證明CAN是水電站PLC通信的上佳選擇。
3.5電源部分
如果PLC使用交流電源，在干擾較強(qiáng)或?qū)煽啃砸蠛芨叩膱?chǎng)合，可以在PLC的交流電源輸入端加接帶屏蔽層的隔離變壓器和低通濾波器，隔離變壓器可以抑制從電源線竄入的外來干擾，提高抗高頻共模*力，屏蔽層應(yīng)可靠地接地。

關(guān)鍵詞：APP ERP 交流電源隔離變壓器