DO86-16
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我們主營(yíng)PLC可編程控制器模塊,DCS卡件,ESD系統(tǒng)卡件,振動(dòng)監(jiān)測(cè)系統(tǒng)卡件,汽輪機(jī)控制系統(tǒng)模塊,燃?xì)獍l(fā)電機(jī)備件等,公司致力于為工業(yè)用戶提供自動(dòng)化解決方案,打造工控備件一站式供應(yīng)平臺(tái)。
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-------------------------------------------------------------------------------------------DO86-16
工業(yè)以太網(wǎng)可以分為兩大類:用于過(guò)程控制領(lǐng)域的工業(yè)以太網(wǎng)(例如HSE)以及用于離散控制領(lǐng)域的工業(yè)以太網(wǎng)(例如EPL)。兩者的共同之處在于網(wǎng)絡(luò)響應(yīng)時(shí)間具有統(tǒng)一的模型,網(wǎng)絡(luò)中的延遲都是其中的重要組成部分。整個(gè)工業(yè)以太網(wǎng)系統(tǒng)的實(shí)時(shí)性能是由網(wǎng)絡(luò)響應(yīng)時(shí)間反映的,影響網(wǎng)絡(luò)響應(yīng)時(shí)間的因素主要來(lái)自三個(gè)部分:本地系統(tǒng)(即源節(jié)點(diǎn)的處理)、工業(yè)以太網(wǎng)網(wǎng)絡(luò)(即傳輸部分)、目的節(jié)點(diǎn)系統(tǒng)(即目的節(jié)點(diǎn)的處理)。某種報(bào)文的實(shí)時(shí)性得到滿足是指其報(bào)文響應(yīng)時(shí)間小于規(guī)定的時(shí)限,某個(gè)節(jié)點(diǎn)的實(shí)時(shí)性合乎要求是指該節(jié)點(diǎn)發(fā)出的所有報(bào)文在的時(shí)限內(nèi)都能獲得響應(yīng)。整個(gè)控制網(wǎng)絡(luò)的實(shí)時(shí)性符合要求是指分布在網(wǎng)絡(luò)上每一個(gè)節(jié)點(diǎn)的每一種報(bào)文的實(shí)時(shí)性均得到保證。為滿足整個(gè)網(wǎng)絡(luò)的實(shí)時(shí)性,對(duì)報(bào)文傳輸給予下列三個(gè)時(shí)間約束條件,則可以*程度地降低網(wǎng)絡(luò)的延遲:
(1)每個(gè)節(jié)點(diǎn)獲得通信權(quán)的時(shí)間有上限值限制。若超過(guò)此值,無(wú)論本次通信任務(wù)是否完成,均應(yīng)立即釋放通信權(quán)。這一時(shí)間約束可防止某一節(jié)點(diǎn)長(zhǎng)時(shí)間占用總線而導(dǎo)致其它各節(jié)點(diǎn)實(shí)時(shí)性惡化;
(2)應(yīng)當(dāng)保證在某一固定的時(shí)間周期內(nèi),網(wǎng)絡(luò)上的每一個(gè)節(jié)點(diǎn)都有機(jī)會(huì)取得通信權(quán),以防個(gè)別節(jié)點(diǎn)因長(zhǎng)時(shí)間得不到通信權(quán)而使其實(shí)時(shí)性太差甚至喪失實(shí)時(shí)性。只要有一個(gè)節(jié)點(diǎn)出現(xiàn)這種情況,整個(gè)網(wǎng)絡(luò)的實(shí)時(shí)性就得不到保證。這一固定時(shí)間周期的長(zhǎng)短是控制網(wǎng)絡(luò)實(shí)時(shí)性好壞的一個(gè)衡量標(biāo)準(zhǔn);
(3)對(duì)于緊急任務(wù),當(dāng)其實(shí)時(shí)性要求臨時(shí)變得很高時(shí),應(yīng)當(dāng)給以優(yōu)先服務(wù)。對(duì)于實(shí)時(shí)性要求比較高的節(jié)點(diǎn),也應(yīng)當(dāng)使它取得通信權(quán)的機(jī)會(huì)比其它節(jié)點(diǎn)多一些。因此采用靜態(tài)(固定)的方式賦予某些節(jié)點(diǎn)較高的優(yōu)先權(quán),采用動(dòng)態(tài)(臨時(shí))的方式賦予某些通信任務(wù)以比較高的優(yōu)先權(quán),則將使緊急任務(wù)及重要節(jié)點(diǎn)的實(shí)時(shí)性得到滿足。
2.3 IEC-61588(2009)實(shí)現(xiàn)
為滿足智能電網(wǎng)的實(shí)時(shí)與互動(dòng),尤其是電能采集系統(tǒng),其前端的各種傳感器連接到數(shù)據(jù)采集板,板上安裝的精確時(shí)鐘通過(guò)IEEE1588協(xié)議的以太網(wǎng)與系統(tǒng)主時(shí)鐘同步,使傳感器的同步時(shí)間發(fā)生在1μs內(nèi),每秒鐘內(nèi)要執(zhí)行200次測(cè)量,測(cè)量間隔5ms,傳感器的輪換時(shí)間是1μs。控制系統(tǒng)內(nèi)的多種測(cè)量?jī)x器在時(shí)間對(duì)準(zhǔn)后,按本地時(shí)鐘捕捉數(shù)據(jù)和分析數(shù)據(jù),清除了觸發(fā)產(chǎn)生的延遲。這種利用IEEE1588協(xié)議的以太網(wǎng)數(shù)據(jù)采集系統(tǒng),節(jié)省大量分別連接每個(gè)傳感器的線纜,達(dá)到精確定時(shí)同步,便于遠(yuǎn)控測(cè)量,成本降低。
當(dāng)前工業(yè)自動(dòng)化使用IRIGB格式時(shí)間碼,每天時(shí)間準(zhǔn)確度小于1μs。而IEEE1588更加具有潛力,可將控制系統(tǒng)的每天時(shí)間準(zhǔn)確度推進(jìn)到100ns。原因IEEE1588協(xié)議可直接將每天時(shí)間信息從主控時(shí)鐘發(fā)送到客戶時(shí)鐘,更具有優(yōu)勢(shì)。從智能電網(wǎng)發(fā)展趨勢(shì)來(lái)看,采用IEEE1588協(xié)議的以太網(wǎng)將會(huì)更適合智能電網(wǎng)。
更為重要的是采用IEEE1588協(xié)議的以太網(wǎng),解決了通用以太網(wǎng)延遲時(shí)間長(zhǎng)和同步能力差的瓶頸,在電能監(jiān)測(cè)應(yīng)用中將發(fā)揮更大作用。確定時(shí)間偏移的典型方法是使用同步消息來(lái)確定對(duì)主機(jī)的偏差。使用平均或?yàn)V波的方式來(lái)平滑連接,并避免每次測(cè)量的過(guò)量校正。對(duì)于時(shí)間校正來(lái)說(shuō),可利用兩個(gè)不同的機(jī)制來(lái)檢測(cè)和校正時(shí)間偏差。
*個(gè)機(jī)制的基本想法是尋找zui小延時(shí)?;舅惴ㄊ窃趜ui近的延時(shí)中檢測(cè)zui小的主機(jī)到從機(jī)的延時(shí)。為防止過(guò)量校正,也對(duì)時(shí)間校正進(jìn)行了限制。這個(gè)方法基于它擁有的信息而在每個(gè)周期都進(jìn)行校正。如果沒(méi)有收到真實(shí)的zui小延時(shí)消息報(bào)文,這將導(dǎo)致不適當(dāng)?shù)男U?nbsp;
第二個(gè)時(shí)間校正機(jī)制是嘗試只使用延時(shí)來(lái)進(jìn)行校正,前提是這些延時(shí)已經(jīng)確定為真實(shí)zui小延時(shí)包,它有助于避免對(duì)時(shí)間值的無(wú)效校正。這個(gè)機(jī)制的基本想法是使用同步和延時(shí)請(qǐng)求來(lái)進(jìn)行時(shí)間校正。對(duì)于同步消息,如果主機(jī)到從機(jī)延時(shí)小于zui小平均路徑延時(shí),測(cè)量結(jié)果就顯示至少有一個(gè)主機(jī)到從機(jī)延時(shí)減去zui小平均路徑延時(shí)的時(shí)間偏差。
兩個(gè)方法都是通過(guò)調(diào)節(jié)一段時(shí)間內(nèi)的精準(zhǔn)時(shí)間協(xié)議的時(shí)鐘速率來(lái)進(jìn)行時(shí)間校正。為了避免速率的大波動(dòng),每一個(gè)校正都限制幅值。這將有助于降低由于時(shí)間偏移的快速校正而引起的時(shí)間間隔誤差。在第二個(gè)機(jī)理中通過(guò)保持時(shí)間誤差值進(jìn)行處理。當(dāng)因接收到的同步或延時(shí)請(qǐng)求引起的新誤差被計(jì)算出來(lái)時(shí),如果這個(gè)新誤差代表了一個(gè)更大的偏差,時(shí)間誤差就更新為新值。否則,時(shí)間誤差保持不變?;跁r(shí)間誤差,只能進(jìn)行有限的校正并從時(shí)間誤差中去除。因此,在完成校正之前,偏移測(cè)量可能進(jìn)行多次校正。圖3為采用美國(guó)國(guó)半公司的DP83640芯片的解決方法。
LOT 23 ALLEN BRADLEY ASSORTED PUSHBUTTON LEGEND PLATE D
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NEW 2IN LENGTH COMPRESSION SPRING D400232
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HONEYWELL SERIES MP918B ALUMINUM SPRING DAMPER ACTUATOR
NEW DORNER 452618M 18IN LONG PINION D355909
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NEW 304 PIPE COUPLING UNION 2IN NPT STAINLESS STEEL 150
NEW PENBERTHY 51541-000 NWH 1/2 STEAM WATER HEATER BRON
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STEEL ROLL PIN HADWARE KIT W/ STORAGE CASE D413956
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ELMO HP-L355 OVERHEAD PROJECTOR D455286
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LOT 9 NEW BUCHANAN 361.362 368 FUSE BLOCK 600V-AC 30A A
NEW STEEL HAMMERMILL SCREEN 5/64IN PERFORATIONS FOR 160
LOT 10 NEW ARPAC 108680-3 HEATER BLOCK PLATE D355044
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LOT 5 NEW JASON 2525 RPP 5 2525X15MM BELT D255379
NEW HYSTER 247672 FORKLIFT STEERING STEER WHEEL SEAL D2
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LOT 2 SWAGELOK BULKHEAD UNION BRASS 3/8 IN TUBE D434466
LOT 2 SWAGELOK 1/8 NPT 1/8 IN TUBE BRASS D430881
NEW HUCK BA-125340 STALL NUT 2015 D298279
NEW SPENCER TURBINE VLV90083 VACUUM SYSTEM INLET VALVE
NEW YALE 5188288-10 S14X CASTER WHEEL 2-1/2IN 4IN D2210
MECAIR 2IN FLANGED DUST COLLECTOR DIAPHRAGM VALVE B3890
LOT 2 NEW M*C BLADDER DIAPHRAGM 19-1/4IN LENGTH 2I
NEW LANTECH 30002769 PIVOT BLOCK D257398
LOT 20 NEW NA OFFICE CHAIR TWIN CASTOR WHEEL D341994
LOT 3 ALLEN BRADLEY MIX 800E-2D0 800F-X10 2 WAY GREEN S
LOT 2 ALLEN BRADLEY 700-F400A1 AC CONTROL RELAY SERIES
LOT 2 ALLEN BRADLEY X-241563 RATIO 300:5A AMP CURRENT T
LOT 2 NEW ALLEN BRADLEY 599-TC2N TERMINAL LINE BLOCK CO
LOT 2 ALLEN BRADLEY 800T-PT16 RED GREEN ILLUMINATED SER
LOT 2 ALLEN BRADLEY 800T-PT16 RED GREEN ILLUMINATED SER
NEW HYTROL B-15238 13IN-39IN BR IDLER END WITH SLAVE RE
TRI CLOVER STAINLESS SANITARY CLAMP 10IN B329323
LOT 2 ALLEN BRADLEY ASSORTED X-343858 183222 75VA 130VA
LOT 8 NEW GATES 3MR630-09 POWERGRIP GT 630X9MM BELT D27
LOT 2 NEW DODGE RELIANCE 117158 1610X3/4KW TAPER-LOCK 3
LOT 3 NEW THOMSON SS-30 CONDUIT LOCK NUT 1-11/16IN D257
LOT 2 NEW DODGE 117091 2012 1-3/8 TAPERLOCK BUSHING 1-3
LOT 3 NEW CAT 6V4364 FORKLIFT PARTS RETAINING RING D231
NEW COILHOSE PE0417-500 POLYETHYLENE TUBING 1/4IN OD 0.
LOT 2 CROUSE HINDS ASSORTED LB27 LL27 CONDUIT FITTING D
LOT 3 NEW NA 10-3/4IN LENGTH 3IN OD 1/8IN WIRE SPRING D
LOT 2 NEW FISHER ASSORTED 1H303511032 1H304411032 PRESS
LOT 2 NEW 7/16IN HEX SHAFT 12-11/16X1-7/8I?N 1GROOVE ROL
NEW FMC 3642 8461 307 FEED CUP STAINLESS STEEL D249392
LOT 2 EMECANIQUE ASSORTED OVERLOAD RELAY LR2-D1305 L
LOT 3 NEW GE FANUC JB-OR1A-G270 O-RING D357200
LOT 6 CORNELL DUBILIER D 200 AFC SOGGY FOIL 30MFD 660V
NEW CAMBRIDGE 50FT LENGTH 3/16IN OD COPPER TUBE REFRIGE
PREMIER 7181 COTTER PIN KIT 1/16X1/2 TO 1/4X3 IN D45581
NEW TRI CLOVER 45 DEGREE ELBOW FITTING PIPE STAINLESS 2
LOT 4 NEW CRITICAL PROCESS ASSORTED GPD 40N00001E0 10N0
LOT 2 NEW TRI CLOVER 37-13A-SS VALVE ACTUATOR COUPLING
LOT 2 NEW GATES 4L320 2320 TRUFLEX V-BELT 32X1/2IN BELT
NEW PIAB 32.01.026 REPAIR KIT D302029
NEW J175S-1 1-1/8IN ID ROTATING UNIVERSAL JOINT B387175
LOT 5 OMRON PTF14A 14 PIN BASE RELAY SOCKET 10A AMP 240
LOT 3 ALLEN BRADLEY 8-530 PHOTOSWITCH RELAY 5A AMP 120V
LOT 2 FOXBORO P0400DL Y ADAPTER MODULE 2 SLOT I/A SERIE
LOT 2 NEW CROUSE HINDS FDD2 CONDULET CAST DEVICE SINGLE
LOT 5 OMRON PTF14A 14 PIN BASE RELAY SOCKET 10A AMP 240
LOT 3 ALLEN BRADLEY 8-530 PHOTOSWITCH RELAY 5A AMP 120V
LOT 2 FOXBORO P0400DL Y ADAPTER MODULE 2 SLOT I/A SERIE
LOT 2 NEW CROUSE HINDS FDD2 CONDULET CAST DEVICE SINGLE
NEW WESTFALIA 0010-8002-040 BOTTOM BEARING CAP PLUG D40
LOT 5 NEW SIEMENS CDT-135R AUTO FIRE ALARM THERMOSTAT D
LOT 2 NEW FOSTER FHS3 3/8IN NPT FEMALE COUPLING QUICK D
NEW PSC 456176 ROTATING SHAFT 1X6IN STEEL D306688
NEW 091.00119.01 STAINLESS BRAIDED METAL FLEX HOSE 1/2I
NEW TRI CLOVER B-UP TUBE STRAINER STAINLESS D339362
SWAGELOK 1/2 NPT 3/8 TUBE BRASS 90 DEGREE ELBOW D430837
NEW GATEWOOD R-PRL2547SS RUBY TIP PARALLEL TRIM NOZZLE
LOT 15 NEW GARDNER BENDER GB KO704 1-1/4 HOLE BOLT KNOC
NEW GRAHAM HELIFLOW STAINLESS HEAT EXCHANGER COIL ASSEM
LOT 2 NEW WATLOW 70XJBGC036A THERMOCOUPLE SURFACE MOUNT
LOT 2 NEW SMH SY6320G1 GRAY FORKLIFT BATTERY CONNECTOR
NEW ALLEN BRADLEY 193-TAPM OVERLOAD RELAY DIN RAIL PANE
LOT 3 NEW TCM 30X42X6TC DICHTOMATIK 30X42X6MM OIL SEAL
LOT 2 NEW OVALSTRAPPING 5C191 ROLLER PIN 1/4IN DIAMETER
LOT 3 NEW CHICAGO RAWHIDE 13932 35X47X7MM OIL SEAL D379
LOT 2 NEW LANTECH 21040301 HOT WIRE SEAL GASKET 1/4X1/2
LOT 4 ALLEN BRADLEY ASSORTED 800T-A 800T-A6 RED SERIES
LOT 3 NEW DAYTON B53 BLUE RIBBON THOROBRED V-BELT 56X21
LOT 3 ALLEN BRADLEY 700-F400A1 AC CONTROL RELAY SERIES
LOT 5 OMRON H3DH TIMER RELAY 3A 250V-AC 0-6SEC B202966
LOT 2 NEW ALLEN BRADLEY 800MR-QA24S SER D ILLUMINATED P
LOT4 BARRY 661-00 ENGINE LOAD BEARING BLACK MACHINE MOU
LOT 10 NEW SPRAYING SYSTEMS QVV-SS 650033 TEEJET SPRAY
LOT 10 NEW SPRAYING SYSTEMS QVV-SS 650067 UNIJET SPRAY
LOT 2 VELAN VALVE HANDLE WHEEL 16MM SQUARE HOLE B305859