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1、现场总线对传统dcs的冲击

现场总线对传统dcs的冲击来源于其本质上于dcs系统的技术特征。根据国际电工委员会IEC和现场总线基金会FF的定义，现场总线技术具有以下5个主要特点：

①数字信号完全取代4-20mA模拟信号；

②使基本过程控制、报警和计算功能等完全分布在现场完成；

③使设备增加非控制信息，如自诊断信息、组态信息以及补偿信息等；

④实现现场管理和控制的统一；

⑤真正实现系统开放性、互操作性。

现场总线技术不仅是一种通信技术，它实际上融人了智能化仪表、计算机网络和开放系统互连(OSI)等技术的精粹。

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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