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140DAO85300

為了延長(zhǎng)PLC控制系統(tǒng)的壽命,在系統(tǒng)設(shè)計(jì)和生產(chǎn)使用中要對(duì)該系統(tǒng)的設(shè)備消耗、元器件設(shè)備故障發(fā)生點(diǎn)有較明白的估計(jì),也就是說,要知道整個(gè)系統(tǒng)哪些部件最容易出故障,以便采取措施。本文將對(duì)PLC過程控制系統(tǒng)故障分布規(guī)律進(jìn)行分析。
? ? 為了延長(zhǎng)PLC控制系統(tǒng)的壽命,在系統(tǒng)設(shè)計(jì)和生產(chǎn)使用中要對(duì)該系統(tǒng)的設(shè)備消耗、元器件設(shè)備故障發(fā)生點(diǎn)有較明白的估計(jì),也就是說,要知道整個(gè)系統(tǒng)哪些部件最容易出故障,以便采取措施?,F(xiàn)以我廠特種水泥1號(hào)線的PLC過程控制系統(tǒng)為例,對(duì)PLC過程控制系統(tǒng)故障分布規(guī)律進(jìn)行分析,希望能對(duì)PLC過程控制系統(tǒng)的系統(tǒng)設(shè)計(jì)和U常維護(hù)有所幫助。
? ? 系統(tǒng)故障一般指整個(gè)生產(chǎn)控制系統(tǒng)失效的總和,它又可分為PLC故障和現(xiàn)場(chǎng)生產(chǎn)控制設(shè)備故障兩部分。PLC系統(tǒng)包括中央處理器、主機(jī)箱、擴(kuò)展機(jī)箱、I/O模塊及相關(guān)的網(wǎng)絡(luò)和外部設(shè)備?,F(xiàn)場(chǎng)生產(chǎn)控制設(shè)備包括I/O端口和現(xiàn)場(chǎng)控制檢測(cè)設(shè)備,如繼電器、接觸器、閥門、電動(dòng)機(jī)等。
? ? 我廠特種水泥1號(hào)線過程控制系統(tǒng)簡(jiǎn)介
? ? 2000年該系統(tǒng)改造時(shí)采用日本二菱公司的A2系列PIC為核心組成的PLC過程控制系統(tǒng)。系統(tǒng)配置如圖1。
? ? 該系統(tǒng)有2個(gè)集中控制室:窯尾控制室和窯頭控制室,其中窯頭控制室為主站;2個(gè)現(xiàn)場(chǎng)工作站:窯尾生料自動(dòng)配料工作站和窯尾成球盤自動(dòng)加水成球工作站;2個(gè)電視監(jiān)控系統(tǒng):預(yù)熱器進(jìn)口下料監(jiān)控和窯頭電視看火。現(xiàn)場(chǎng)工作站是獨(dú)立的微機(jī)自動(dòng)控制系統(tǒng),它與主站只進(jìn)行模擬量的通訊和開關(guān)量的聯(lián)鎖。主站與從站間采用幀同步全雙工通訊方式:
? ? 該系統(tǒng)運(yùn)行近3年來(lái)PLC故障統(tǒng)計(jì)
? ? 現(xiàn)場(chǎng)控制設(shè)備故障統(tǒng)計(jì)
? ? 經(jīng)統(tǒng)計(jì),系統(tǒng)故障共計(jì)126次,其中PLC的故障比例約為4.7%,現(xiàn)場(chǎng)部分故障比例約為95.3%,:對(duì)照其他PLC過程控制系統(tǒng)的故障數(shù)據(jù),并考慮該系統(tǒng)運(yùn)行時(shí)間不是很長(zhǎng),該比例比較接近一般PLC過程控制系統(tǒng)的故障分布規(guī)律,有一定的普遍性。一般來(lái)講PIC部分的故障比例約為5%,現(xiàn)場(chǎng)控制設(shè)備的故障比例約為95%。
? ? PLC過程控制系統(tǒng)故障分布的估
? ? PLC主機(jī)系統(tǒng)最容易發(fā)生故障的地方一般在電源系統(tǒng)和通訊網(wǎng)絡(luò)系統(tǒng),電源在連續(xù)工作、散熱中,電壓和電流的波動(dòng)沖擊是不可避免的。通訊及網(wǎng)絡(luò)受外部干擾的可能性大,外部環(huán)境是造成通訊外部設(shè)備故障的最大因素之一。系統(tǒng)總線的損壞主要由于現(xiàn)在PLC多為插件結(jié)構(gòu),長(zhǎng)期使用插拔模塊會(huì)造成局部印刷板或底板、接插件接口等處的總線損壞,在空氣溫度變化、濕度變化的影響下,總線的塑料老化、印刷線路的老化、接觸點(diǎn)的氧化等都是系統(tǒng)總線損耗的原因。所以在系統(tǒng)設(shè)計(jì)和處理系統(tǒng)故障的時(shí)候要考慮到空氣、塵埃、紫外線等因素對(duì)設(shè)備的破壞。目前PLC的主存儲(chǔ)器大多采用可擦寫ROM,其使用壽命除了主要與制作工藝相關(guān)外,還和底板的供電、CPU模塊工藝水平有關(guān)。而PLC的中央處理器目前都采用高性能的處理芯片,故障率已經(jīng)大大下降。對(duì)于PLC主機(jī)系統(tǒng)的故障的預(yù)防及處理主要是提高集中控制室的管理水平,加裝降溫措施,定期除塵,使PLC的外部環(huán)境符合其安裝運(yùn)行要求;同時(shí)在系統(tǒng)維修時(shí),嚴(yán)格按照操作規(guī)程進(jìn)行操作,謹(jǐn)防人為的對(duì)主機(jī)系統(tǒng)造成損害。
? ? PLC最大的薄弱環(huán)節(jié)在I/O端口。PLC的技術(shù)優(yōu)勢(shì)在于其I/O端口,在主機(jī)系統(tǒng)的技術(shù)水平相差無(wú)幾的情況下,I/O模塊是體現(xiàn)PLC性能的關(guān)鍵部件,因此它也是PLC損壞中的突出環(huán)節(jié)。要減少I/O模塊的故障就要減少外部各種干擾對(duì)其影響,首先要按照其使用的要求進(jìn)行使用,不可隨意減少其外部保護(hù)設(shè)備,其次分析主要的干擾因素,對(duì)主要干擾源要進(jìn)行隔離或處理。
? ? 在整個(gè)過程控制系統(tǒng)中最容易發(fā)生故障地點(diǎn)在現(xiàn)場(chǎng),表2列出了現(xiàn)場(chǎng)中最容易出故障的幾個(gè)方面。
? ? 第一類故障點(diǎn)(也是故障最多的地點(diǎn))在繼電器、接觸器。如該生產(chǎn)線PLC控制系統(tǒng)的日常維護(hù)中,電氣備件消耗量最大的為各類繼電器或空氣開關(guān)。主要原因除產(chǎn)品本身外,就是現(xiàn)場(chǎng)環(huán)境比較惡劣,接觸器觸點(diǎn)易打火或氧化,然后發(fā)熱變形直至不能使用。在該生產(chǎn)線上所有現(xiàn)場(chǎng)的控制箱都是選用密閉性較好的盤柜,其內(nèi)部元器件較其他采用敞開式盤柜內(nèi)元器件的使用壽命明顯要長(zhǎng)。所以減少此類故障應(yīng)盡量選用高性能繼電器,改善元器件使用環(huán)境,減少更換的頻率,以減少其對(duì)系統(tǒng)運(yùn)行的影響。
? ? 第二類故障多發(fā)點(diǎn)在閥門或閘板這一類的設(shè)備上,因?yàn)檫@類設(shè)備的關(guān)鍵執(zhí)行部位,相對(duì)的位移一般較大,或者要經(jīng)過電氣轉(zhuǎn)換等幾步驟才能完成閥門或閘板的位置轉(zhuǎn)換,或者利用電動(dòng)執(zhí)行機(jī)構(gòu)推拉閥門或閘板的位置轉(zhuǎn)換,機(jī)械、電氣、液壓等各環(huán)節(jié)稍有不到位就會(huì)產(chǎn)生誤差或故障。長(zhǎng)期使用缺乏維護(hù),機(jī)械、電氣失靈是故障產(chǎn)生的主要原因,因此在系統(tǒng)運(yùn)行時(shí)要加強(qiáng)對(duì)此類設(shè)備的巡檢,發(fā)現(xiàn)問題及時(shí)處理。我廠對(duì)此類設(shè)備建立了嚴(yán)格的點(diǎn)檢制度,經(jīng)常檢查閥門是否變形,執(zhí)行機(jī)構(gòu)是否靈活可用,控制器是否有效等,很好地保證了整個(gè)控制系統(tǒng)的有效性。

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Icom IC-R71A Communications Receiver for parts

RS POWER REFLECTION METER . NAP Model 392.4017.02

Varian Turbo-V 250 MacroTorr Turbomolecular Vacuum Pump

MINICOM SMART IP ACCESS 1SU51068/R

5 Units of Analog Devices – 5962-8969701XA Resistors

MKS BARATRON Model. 690A01TRC Vacuun transducer head

IBM System Board 42D3638 IBM Original Part X 3550

10 x 5= 50 Units Kodak Professional PORTRA 400VC FILM

MODICON QUANTUM 140CRA93100 Remote Drop S908 Version 4.

DAYTON JET PUMP MOTOR 115-230Volts // + TEEL 9P997A

CIT Alcatel 2012A Industrial Vaccuum Pump Oil

YAW GYRO PART ELEC. DWG. 29 A9

450 pieces of 2N2905A TRANSISTOR

HP Model 6130C DIGITAL VOLTAGE SOURCE / + – 50 VOLTS

ABB PROCESS ANALYTICS Mod IVS1500-1 INTELLIGENT VOLTAGE

APPLIED MATERIALS 0100-76048 SAC CONTACTOR CONTROL BD.

ABB Asea Brown Boveri – Wiring Accessories UNF – 50S

National Instruments SCXI-1000 SCXI-1121 SCXI-1160 Mint

JOHNSON CONTROLS Digital Controller DX-9100-8454

TEKTRONIX 2230 DIGITAL STORAGE OSCILLOSCOPE 100MHz

CISCO Route Switch Processor 8 CNP2J60BAA

TELEWAVE 44A RADIO RF WATT POWER SWR METER

POLARAD 1207A SIGNAL SOURCE 3.70-8.40GHz

BALDOR Industrial Three Phase Motor M3538 / 34A61 – 872

BAUSCH & LOMB Stereo Zoom 7 ZOOM RANGE 1.0X – 7.0X

LEYBOLD TURBOTRONIK NT 150/360 TURBO CONTROLLER

Omron Safety Light Curtain TYPE 4 F3SN-A0622P25-D

7 Texas Instruments – TMS320C40GFL50 & 1-TMS320C40GFL4?0

WAVETEK ROCKLAND 753A BRICKWALL FILTER

COLLINS RADIO CONTROL 714E-3

CISCO SYSTEMS WS-X4013 Supervisor II Engine

OMC Carburetor 389723 MX 25 B L

Carburetor WMA4-3

2 PHILIPS TUBES Type 28136 Emission 1400mA 6,5V kV125

HP 6002A DC POWER SUPPLY 0-50V 0-10A 200W OPT 001

BOARD PEAK 7220 4BP07220D1 + CPU INTEL + 2x 512MB ECC

Agilent / HP 34401A – Digital Multimeter
powers up for parts or repair

ALCATEL 1521 FL IP unit with cables & Power Adapter

SCHAFFNER FN356-16-06 Filter 440/250VAC 50-60Hz

MKS BARATRON MANOMETER 627B -21619 PRESSURE TRANSDUCER

CERAGON NETWORKS WINLINK 104 RT/E1 PN:SW-0001-0

MTI DSP200 Video Processor DAGE-MTI 104662

Sierra Frequency Selective Voltmeter Model 127C

HAMEG HM203 -5 Oscilloscope 20MHz HM 203-5

2 Avaya 4610SW IP Telephone IP

NEW MAR 12-12-35 I ISOLATED DC-DC CONVERTER NEWMAR

HP PROLIANT DL320 G3 3.4GHz 1 GB SERVER

2 Units Aircraft Clock Indicators WAKMANN MFR`S 7510

Enlarge
24 Texas Instruments DSP Floating PT 32-Bit 50MHz

Bellingham & Stanley No-608405

Circle Seal PSI Shutoff Valve T949T-6BB

Tektronix P6139A 500MHz Probe + TEK P6133 Probe Passive

OMRON Programmable Controller SYSMAC CPM2A -60CDT1-D

Inter M PA-9324 PUBLIC ADDRESS POWER AMPLIFIER 240W

D-MUX DAB MULTIPLEXER itis POWER UP.

28 UNITS HP Jetdirect 615N j6057a NetworkCard 10/100tx

CONTROL TECHNIQUES UNIMOTOR UM Model 75UMB200VBCAA

SUN Microsystems Expansion I/O Module 370-6774 -02

ATHENA Temp Controller Type 4X 16-KF-T

RAD HTU-E1 48 / E1 LOS HDSL LOS

GALLON ALLOY / MILLIPORE 155PSI / T 316 L

3Com BOARD 3CB9FG24T / NETWORK SWITCH ADAPTER

SQUARE D COMPANY CIRCUIT BREAKER (15)+ CABINET ELECTRIC

LOTS OF 7 LEACH PRECISION RELAYS 9224-4128 28VDC

AXCELIS MAGNETRON M200PC LOW FREQ. 200P/1/1501 HITACHI

LOT OF 7 HP Notebook OMNIBOOK 6100

NIKON AF TELECONVERTER TC-16A 1.6X Lens

MicroFlex DAP PC9000 Handheld Computer PC-9000

2 C.H.F MULLER TUBES Type 28136 EMISSION 1400mA 6,5V

Fluke 45 Dual Display Multimeter

20 Units Of Analog Devices – AD9713BAN Transistors

WILTRON 560A SCALAR NETWORK ANALYZER

2 UNITS OPTIUM CORPORATION Modl 14TRBRL1MAL Transponder

OMRON Programmable Controller SYSMAC CPM2A -20CDR-A

LOT OF 30 ANALOG DEVICE AD559KD VINTAGE WHIE GOLD IC’s

Aircraft indicator ELECTRIC TURN&BANK for collectors

HP Model 8553B spectrum analyzer – Rf section

Fujinon A16x ZOOM LENS VCL-916BYA Video Camera Lens

DATAMAX LASERCHEK LC2911 + SYMBOL SCAN LCS 2911 + GUID

ASYST CMF CONTROL MODEL:C0094-086?0-01

MDC High VACUUM Model. 990669 / 990668 / 96-82730

Tektronix 465 100 Mhz dual channel oscilloscope / No7

INTERCOMP PT300 DW Wheel Load Scale DIGITAL SCALE TRUCK

AudioCodes Trunkpack-200 & txb-22 & txb-10 PCI

KRAMER VP-82 8×2 RGBHV / BALANCED AUDIO MATRIX

Lot of 14 Motorola Speaker Mics NMN6191B

NOS Hexacon 100W P100 Electric Soldering Iron in box
New old stock, read description

ANTENNA DORNE & MARGOLIN Type DM C100-6 AIRCRAFT

LANNET BUPS-LETS-10/18?E Chassis for Power Supply

Custom Control Sensor CCS IG409 SWITCH PRESSURE FAA-PMA

Schlumberger Technologies Board No. 40911403

VENTILATOR RESUSCITATOR MODEL 2-R used

VENTILATOR RESUSCITATOR MODEL 2 used

MOVAZ NETWORKS 150-1081-01 OLD W/RAMAN AMP RAY OPTICAL

3Com BOARD 3CB9LG9MC / NETWORK SWITCH ADAPTER

Control Techniques Unimotor UM 115UMD300CBCAA

46 AIRPAX ELECTRO Cambridge Switch SPDT BREAKER CONTACT

Little Giant pump 5-MD-HC (583613) 230v 50/60Hz 3000rpm

VARIAN Vacuum VA-160Y traveling wave tube

LOTS OF 350 IRC RN70D MDC 1% 1961F T6940 RESISTORS

RAD ACE-101 ATM-NTU NETWORK ROUTER / AC / SPR

LAIPPLE ANTRIEBSTECHNIC MOTOR TYPE M63S/6 820rpm 50hz

HP 5086-7720 MIXER 22 GHZ

7 ELECTRON TUBE PERKIN ELMER JAN-7665A MFR 25506

NEW! GOOGLE NEXUS ONE 1 HOT EXCLUSIVE RARE DOMAIN NAME!

7 x 30= 210 STRIPS FUJICOLOR PAPER 8.9 x 35.0cm CONTROL

M-AUDIO 1010 LT 1010LT PCI CARD AUDIO

SUPER VEXTA 5-PHASE DRIVER UDX5114N Oriental Motor

HP 1340A DISPLAY OPT 216 / OPT 315

WABCO AIR COMPRESSOR Type 16397799 / 176cm3


選擇深圳長(zhǎng)欣,選擇放心,售后無(wú)憂大量現(xiàn)貨,當(dāng)天順豐發(fā)貨!
主營(yíng):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。

先介紹幾點(diǎn)經(jīng)驗(yàn)。
1、先通讀一遍“系統(tǒng)手冊(cè)”(不管能不能看懂,先了解個(gè)大概,以便學(xué)習(xí)編程時(shí)查找);
2、由位控邏輯入手,逐漸增加定時(shí)、計(jì)數(shù)等條件,把或、與、非關(guān)系理順;
3、進(jìn)而練習(xí)整數(shù)運(yùn)算、實(shí)數(shù)運(yùn)算、類型轉(zhuǎn)換;
4、量程轉(zhuǎn)換、PID調(diào)節(jié)回路的建立及P、I、D參數(shù)的理解(最好是有個(gè)物理回路驗(yàn)證,比如變頻器+電機(jī)+測(cè)速傳感器);
5、循環(huán)、順序、跳轉(zhuǎn)等程序控制(盡量避免跳轉(zhuǎn),非跳不可時(shí)也是跳的越近越好);
6、中斷、通訊、位置控制....

本人以ABB工業(yè)機(jī)器人配件DSQC系列和Motorola MVME系列,GE 卡件 模塊 驅(qū)動(dòng)器系列為主攻。各位電工朋友可根據(jù)自己的條件選擇適合自己的PLC品牌,由于PLC的基本框架大同小異,學(xué)會(huì)一種至于其它的學(xué)習(xí)起來(lái)也就簡(jiǎn)單了。