GE IS3600A0AA2
上世紀(jì)九十年代走向?qū)嵱没默F(xiàn)場(chǎng)總線(xiàn)控制系統(tǒng)，正以迅猛的勢(shì)頭快速發(fā)展，是目前世界上最新型的控制系統(tǒng)。現(xiàn)場(chǎng)總線(xiàn)控制系統(tǒng)是目前自動(dòng)化技術(shù)中的一個(gè)熱點(diǎn)，正受到國(guó)內(nèi)外自動(dòng)化設(shè)備制造商與用戶(hù)越來(lái)越強(qiáng)烈的關(guān)注?，F(xiàn)場(chǎng)總線(xiàn)控制系統(tǒng)的出現(xiàn)，將給自動(dòng)化領(lǐng)域帶來(lái)又一次革命，其深度和廣度將超過(guò)歷史的任何一次，從而開(kāi)創(chuàng)自動(dòng)化的新紀(jì)元。 在有些行業(yè)，F(xiàn)CS是由PLC發(fā)展而來(lái)的；而在另一些行業(yè)，F(xiàn)CS又是由DCS發(fā)展而來(lái)的，所以FCS與PLC及DCS之間有著千絲萬(wàn)縷的聯(lián)系，又存在著本質(zhì)的差異。本文試就PLC、DCS、FCS三大控制系統(tǒng)的特點(diǎn)和差異作一分析，指出它們之間的淵源及發(fā)展方向。（儀器儀表世界網(wǎng)）
目前，在連續(xù)型流程生產(chǎn)自動(dòng)控制(PA)或習(xí)慣稱(chēng)之謂工業(yè)過(guò)程控制中，有三大控制系統(tǒng)，即PLC、DCS和FCS。它們各自的基本特點(diǎn)如下：
1、PLC
(1)從開(kāi)關(guān)量控制發(fā)展到順序控制、運(yùn)送處理，是從下往上的。
(2)連續(xù)PID控制等多功能，PID在中斷站中。
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NEW ALFA LAVAL 390 SEAL RING 48X35X19MM BUTTERFLY VALVE REPLACEMENT PART D260407
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NEW KHS-BARTELT 685-92-71-050/3?A VALVE MOUNTING KIT REPLACEMENT PART D426689
NEW NORGREN MB002A QUIETAIRE 1/4 IN NPT PNEUMATIC MUFFLER SILENCER D463202
NEW WALLACE & TIERNAN P 43111 GAS FLOW ConTROL APPARATUS SPRING D472666
NEW NASH PF-0927-15 UNIOn ORIFICE 2IN FOR NASH CL-6002 REPLACEMENT PART B411780
NEW TRI CLOVER B53-6000-SK ACTUATOR REPAIR KIT D508099
NEW SKF B-9784-82 SEAL KIT REPLACEMENT PART D451974
NEW BINER ELLISON D-44-2396 NO.63 CAPPER CHUCK HOLDER ALUMINUM 1-1/2IN D260591
NEW PAAL B0030.516 LOCKING COLLAR REPLACEMENT PART D375083
NEW TRI CLOVER 12-146-1-316L STAINLESS SHUT-OFF VALVE BonNET 1 IN D449945
NEW RULAND SP39SS STAINLESS COLLAR 2-7/16IN ID X 3-1/2IN OD X 1IN THICK D421810
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NEW SKF TSN 520 GA LIP DOUBLE SEAL REPLACEMENT PART D298426
NEW CHESTERTON 010357 3.000 X 4.000 X 0.500 PUMP PACKING RING GRAPHITE D476825
NEW CHESTERTON 010357 3.000 X 4.000 X 0.500 PUMP PACKING RING GRAPHITE D476825
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NEW VK 110 12 END CAP 110MM OD 12MM THICK SHAFT REPLACEMENT PART D415044
NEW KRonES C-K13-00-003-5 110 PTFE DIAPHRAGM ACTUATOR REPLACEMENT PART B491463
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NEW 100045 SPLINED BORE VAIRABLE SPEED DISC PULLEYS D339850
NEW REEVES D132660 15/16IN BORE VARIABLE SPEED PULLEY DISC KIT D397828
NEW MERIT ABRASIVES 61059 POWER-LOCK ABRASIVE DISC 3IN 60 GRIT D449066
NEW CREPACO 06H-P-342456 7/8IN THREAD STEEL DOUBLE ENDED STUD SHAFT D346999
NEW ASCO 182882 VALVE SPARE PART KIT REPLACEMENT PART D354403
BonNEY FORGE SA A105 3000CWP UNIOn PIPE IRON 2 IN NPT FITTING B251192
NEW LOVEJOY 685144-67587 LS150 RING onLY IN SHEAR D353919
NELES JAMESBURY ST50 EF8345G1 150PSI MAX ACTUATOR REPLACEMENT PART B444741
NEW DODGE RELIANCE 79156 06N PX 30MM BORE 121MM OD GEAR D424400
DODGE RELIANCE 41511265TD SIZE 050 REEVES ConSTANT DISC REPAIR KIT B482478
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