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1、現場總線對傳統dcs的衝擊
現場總線對傳統dcs的衝擊來源於其本質上於dcs係統的技術特徵。根據國際電工委員會IEC和現場總線基金會FF的定義,現場總線技術具有以下5個主要特點:
數字信號完全取代4-20mA模擬信號;
使基本過程控制、報警和計算功能等完全分布在現場完成;
使設備增加非控制信息,如自診斷信息、組態信息以及補償信息等;
實現現場管理和控制的統一;
真正實現係統開放性、互操作性。
現場總線技術不僅是一種通信技術,它實際上融人了智能化儀表、計算機網絡和開放係統互連(OSI)等技術的精粹。
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KOMATSU 58F-60-41530 5FT LENGTH HOSE ASSEMBLY D562742
ENTERPRISE EGB30-T-A BOND ROLL 30IN X 500FT 3IN CORE D559764
NATIONAL CHEMICALS KLEEN COIL KN1GN 1GAL EVAPORATOR COIL CLEANER D544607
SLOAN 110 3010100 ROYAL DUAL FILTERED BY-PASS DIAPHRAGM D554680
GARDNER DENVER 01247120 JOY GUARD-VALVE D548960
GARDNER DENVER 1760407-0031 COMPRESSOR SUCTION VALVE SEAT D548970
BLACKMER F210A PETROLEUM ROTARY HAND DRUM PUMP 3/4 IN IRON D549057
EMERSON KT055 450XL VMC COMPRESSOR GASKET KIT D555578
BRISTOL WA-40897 THERMOMETER PRESSURE GAUGE LINK SYSTEM D537362
GARDNER DENVER 01247120 JOY GUARD-VALVE D549179
BALTIMORE AIRCOIL 310742 DAMPER ACTUATOR D541739
BALTIMORE AIRCOIL 310742 DAMPER ACTUATOR D541739
12IN LENGTH SA182/A182 F304 150 3IN FLANGED STAINLESS BRAIDED HOSE D555809
MMS REACT SYSTEM COMPUTER D525661
ABB 242GA 042L01838 UPPER VALVE SEAT KIT D523141
PSM 300 AND PSM 400 THERMAL PROTECTION MODULE D537518
FOCKE 095.98128.08217-00 HOLDER 40MM X 31MM X 28MM D552106
AFL WTPO600-4N4-AA ALUMINUM WELDED TERMINAL CONNECTOR 230KV D523242
DRESSER 0040 9110 003 12.750 PIPE COUPLING REAPIAR CLAMP D563375
TRI CLOVER B31-14MP-4X2-316L-7 4X2 IN TRI-CLAMP CONCENTRIC REDUCER D550661
PRISIM ASSEMBLY W/ BAG & CASE D523279
ALFA LAVAL L31-4X2-304-7 TRI-CLOVER 4X2IN TRI-WELD STAINLESS REDUCER D550647
ALFA LAVAL 14VB-A-3-304-1 3IN STAINLESS BUTT WELD STUB END D550639
ABB 516B388G04 CROSSARM PISTON CONTACT D523218
ALFA LAVAL B31-14MP-4X2-316L-PL 4X2IN TRI-CLAMP CONCENTRIC REDUCER D550650
PHOTOVAC ISOTHERMAL GC COLUMN OVEN D521189
HUBBELL 02207003 KELLEMS DOUBLE EYE SUPPORT CORD GRIP D563454
HUBBELL 02207004 KELLEMS DOUBLE EYE SUPPORT CORD GRIP D563453
PROCO TYPE RE-FA-151-BB EXPANSION JOINT 10X16 IN ID 23-1/4 IN LENGTH D546065
ALLEN BRADLEY 1492-H2B TERMINAL BLOCK SER B D529811
SMITH BLAIR 41100055601003 411 PIPE COUPLING 5IN NOMINAL 5.56IN OD D560486
DIXON DC2023 AIR CHIEF BRASS SEMI-AUTO FEMALE COUPLER D560325
VALVE POSITION INDICATOR & HOUSING D556497