描述
PLC對(duì)模擬量信號(hào)的識(shí)別是通過PLC的模擬量輸入輸出模塊來完成的。模擬量輸入輸出模塊采用A/D轉(zhuǎn)換原理,輸入端接收來自傳感器或變送器的模擬信號(hào),輸出端輸出的模擬信號(hào)作用于PLC的控制對(duì)象。PLC診斷模擬量故障的過程,實(shí)質(zhì)就是將在相應(yīng)A/D通道讀到的監(jiān)測(cè)信號(hào)的模擬量的實(shí)際值與系統(tǒng)允許的極限值相比較的過程。如果比較的結(jié)果是實(shí)際值遠(yuǎn)離極限值,則表明軋鋼生產(chǎn)設(shè)備對(duì)應(yīng)的受監(jiān)控部位處于正常狀態(tài),如果實(shí)際值接近或達(dá)到極限值,則為不正常狀態(tài)。判斷故障發(fā)生與否的極限值根據(jù)實(shí)際系統(tǒng)相應(yīng)的參數(shù)變化范圍確定,利用PLC上的模擬量設(shè)定開關(guān)可精確設(shè)置該極限值。
當(dāng)模擬量的實(shí)際值達(dá)到模擬量設(shè)定開關(guān)的設(shè)定值,PLC還能按照一定的邏輯關(guān)系啟動(dòng)開關(guān)量模塊上的輸出位,或者從PLC的通訊口主動(dòng)發(fā)起通訊,從而輸出故障診斷的結(jié)果,并據(jù)此實(shí)現(xiàn)對(duì)軋鋼生產(chǎn)設(shè)備的控制。
2.3基于中斷方式的故障診斷
PLC的中斷方式有:
(1)輸入中斷;
(2)間隔定時(shí)器中斷;
(3)高速計(jì)數(shù)器中斷。其中,輸入中斷特別適合于軋鋼生產(chǎn)設(shè)備的故障診斷。它對(duì)應(yīng)于工業(yè)操作站的硬中斷,屬于外部中斷,但PLC的輸入中斷可用PLC的外部指令來屏蔽。將軋鋼生產(chǎn)設(shè)備的故障信號(hào)作為PLC的輸入中斷源,一旦出現(xiàn)故障信號(hào),CPU立即響應(yīng),停止正在執(zhí)行的程序,轉(zhuǎn)到中斷子程序中去,即可方便地對(duì)故障進(jìn)行處理。它與直接利用PLC的內(nèi)部邏輯完成故障診斷的不同之處在于:采用輸入中斷處理故障時(shí),可停止PLC主程序的執(zhí)行過程,而直接利用PLC的輸入和內(nèi)部邏輯處理故障時(shí),PLC的主程序仍處于運(yùn)行狀態(tài)。因此,要根據(jù)故障對(duì)軋鋼生產(chǎn)設(shè)備的影響程度選擇合適的故障診斷方式。PLC的輸入中斷方式對(duì)后果嚴(yán)重的突發(fā)故障的處理特別有用。3PLC在故障診斷系統(tǒng)中的作用
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。
C52781 Sloan Dektak V300-Si 12″Wafer Surface Profiler
C73574 MRSI 505 Assembly Work Cell Pick&Place System
K69474 Logitech LP50 Precision Lapping&Polish.System
C71289 Micrion 9100 Focused Ion Beam FIB Milling System
C73914 Varian Unity Inova 500 NMR Spectrometer System
C54479 Jeol JSM-IC848 Scanning Electron Microscope
C75409 Zeiss EM902A Transmission Electron Microscope
C69679 K&S 4524AD Digital Manual Ball Wire Bonder
C72437 Finnigan MAT 8230 Mass Spectrometer
A74871 Mydax 2VLH60W Water-Cooled Chiller/Heater
C68069 HP 83000 Digital Test System Model F660
G52281 Nanometrics Nanospec 9000 Film Analysis System
G40450 ADE Technologies Polar Kerr System
A69510 Logitech 1WBT2 Wafer Substrate Bonder,3 Station
G69555 Logitech 1WBS2 Wafer Substrate Bonder
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G54625 Asymtek A-612C Dispensing System
G50677 FK Delvotec 6320 Bonder System
C59111 Electroglas 2001CXE 6”Wafer Prober 2001CX 2001X
C69224 K&S 4522 Multi-Process Gold Wire Ball Bonder
A73230 Beckman P/ACE MDQ Capillary Electrophoresis Sys
C55921 YES Yield Engineering Sys YES5 Vapor Prime Oven
A73251 Kodak Image Station 4000MM Pro Imaging System
G70686 Multiline Technology Optiline Post X-Ray Machine
C59242 Electroglas 3001X 8″Wafer Prober Probe Station
C74218 PE Sciex API QStar Pulsar 1 Mass Spectrometer
A51532 Asymtek Millennium Series Dispensing System,600
C56237 Zevatech CT-3000 Pick and Place Machine
G54212 Asymtek A-618C Millennium Dispensing System
G66395 Hitachi S-2300 Scanning Electron Microscope
G54295 Asymtek Dispensing System
G75521 TA Inst.TGA2050 Thermogravimetr?ic Analyzer
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A70055 Thermo Nicolet Nexus 470 FT-IR,Centaurus Scope
A69734 LC Packings Famos,Switchos,Ultimate HPLC Sys
AE43005 Synax SX-141 Pick and Place Wafer Handler
AN43004 Alessi 6″Prober XYZ w/Microscope,Extras
A58421 Wentworth Labs 8″Prober MM2004(0-043-0001)
C69531 Rudolph AutoEL III 2B 4A Automatic Ellipsometer
C69866 K&S 4129 Vertical Feed Wedge Bonder w/Heated Tip
A73561 Cincinnati Test Systems Sentinel M24 Leak Test
C57559 Tokyo Seimitsu TSK A-WD-4000A Wafer Dicing Saw
A74058 Yamato Ohkawara DL-41 Spray Dryer
L66981 Disco Corp Automatic Dicing Saw DAD-3D/8
C71085 Gaertner Scientific Corp.L115 S Ellipsometer
C70347 Solid State Measurements CV Test Analysis System
C69865 K&S 4124 Gold Ball Wire Bonder w/LWD Microscope
C69864 K&S 4124 Gold Ball Wire Bonder w/Negative E.F.O.
C69692 K&S 4124 Thermosonic Gold Ball Wire Bonder
C28990 Orthodyne 20R Wire Bonder w/Nikon SMZ-1 Scope
C62291 Rucker&Kolls R&K 691 Automatic Wafer Prober
CT71086 Karl Suss Wafer Prober Probe Station w/Wild M3Z
K74410 GE LUNAR Prodigy 8743 Bone Densitometer Density
C59276 Orthodyne 20B Ultrasonic Large Wire Bonder
C69693 K&S 4129 Deep Access 90°Wedge Wire Bonder
C64901 K&S Kulicke Soffa 4126 Step-Back Wedge Bonder
C59003 K&S 4123 Manual Wedge Wire Bonder(Refurbished)
C58972 K&S 4123 Manual Wedge Wire Bonder(refurbished)
A73229 Beckman Coulter DU 800 UV/Vis Spectrophotomet?er
C69596 Westbond 7400A Deep Access Vertical Feed Bonder
C64574 HTG 84-3(350W)UV Lamp Mask Aligner w/Power Sup
G51906 Wentworth Labs.MP2000 8″Probe Station