YASKAWA JEPMC-PC040
系統(tǒng)網(wǎng)絡 對DCS而言，系統(tǒng)網(wǎng)絡是整個系統(tǒng)的基礎(chǔ)和核心，對整個系統(tǒng)的實時性、可靠性和可擴充性起著決定性的作用。對混合式控制系統(tǒng)也是如此。 如圖1所示，HCS是分級控制系統(tǒng)，共分兩級：操作管理級及過程控制級。操作管理級的各項設(shè)備——操作員工作站及中央服務器由N1網(wǎng)連接。N1網(wǎng)是一局域網(wǎng)（LAN），對它的要求是能以較高的速率傳輸大量數(shù)據(jù)，可選用Ethernet（以太網(wǎng)）或ARCNET。Ethernet采用載波偵聽/多路訪問協(xié)議，具有10Mbps及100Mbps的通訊速度，但它不具備實時性；ARCNET采用令牌傳輸協(xié)議，具有2.5Mbps的通訊速度，具有好的實時性。 N1網(wǎng)的網(wǎng)絡拓樸結(jié)構(gòu)可采用星形、總線形、混合形等?？偩€結(jié)構(gòu)的網(wǎng)絡技術(shù)比較成熟，施工相對簡單，節(jié)點的加入或退出也無需中止網(wǎng)絡運行，是工業(yè)控制網(wǎng)常用的網(wǎng)絡結(jié)構(gòu)。N1網(wǎng)的傳輸介質(zhì)可使用雙絞線、同軸電纜或光纖。 N2網(wǎng)將過程控制級的控制器與控制器、控制器與遠程I/O、遠程I/O與遠程I/O連接起來，并使之與中央服務器相連. 對N2網(wǎng)的要求是實時性，即一旦N2網(wǎng)上某節(jié)點發(fā)送數(shù)據(jù)，則該網(wǎng)絡上所連接的各節(jié)點應能同時接收到該數(shù)據(jù)，實現(xiàn)數(shù)據(jù)共享。這一點對實時性很強的過程控制十分重要。N2網(wǎng)還具有其它特性，如給網(wǎng)絡添加新設(shè)備不會造成網(wǎng)絡通訊擁塞，徹底消除系統(tǒng)瓶頸現(xiàn)象；開放式體系結(jié)構(gòu)使它與PLC、智能馬達驅(qū)動器等其它設(shè)備相兼容。 A-B的ProcessLogix過程控制系統(tǒng)N1網(wǎng)采用總線結(jié)構(gòu)的Ethernet，N2網(wǎng)采用A-B自己的ControlNet網(wǎng)絡，如果采用中繼器，傳輸距離可達30km。
DUFF NORTON M2015-422B STAINLESS SCREW JACK 1 IN WORM GEAR
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CATERPILLAR CAT 106-9343 8-1/2 IN 5-1/2 IN 5 IN SPHERICAL PLAIN
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KTM V-676 3 IN PNEUMATIC 150 STAINLESS FLANGED SEGMENTED BALL
SAFTRONICS DY4-75 3902-01 SOLID STATE BRAKE 4.5KW 150A AMP DRIVE
KITZ SCS14 6 IN STAINLESS FLANGED BALL VALVE B465284
ALLEN BRADLEY 1333-DAA D+ ADJUSTABLE FREQUENCY 7.5HP 27/24A AC
WEBER TC120530-3 WEBTROL 1-1/4X1IN NPT 3HP STAINLESS CENTRIFUGAL
ALLEN BRADLEY 1336F-CWF20-AN-EN-MX3 2HP ADJUSTABLE FREQUENCY AC
NEW ALLEN BRADLEY MPL-B420P-MK24AA KINETIX 460V 6.4A 1.9KW SERVO
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NEW DOMINO DDC3 L007440 BLACK STD LASER D434406
FNW 65LM 8 IN 150 STAINLESS FLANGED KNIFE GATE VALVE D471876
FNW 67B 8 IN 150 STAINLESS FLANGED KNIFE GATE VALVE D467338
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CUTLER HAMMER HND3800T33W 3P 800A 600V-AC MOLDED CASE CIRCUIT
ALLEN BRADLEY 712 709-EOD 120V-AC 100HP 135A AMP SIZE 4 MOTOR
LOMA SYSTEMS 6000 SERIES CHECKWEIGHER CONTROL OPERATOR INTERFACE
CATERPILLAR CAT 245-3682 TRUCK SLACK ADJUSTER EQUIPMENT
NEW GOODYEAR 6160-14M-170 6160MM 170MM 14MM TIMING BELT D423437
YOKOGAWA DC100-12-11-1W DARWIN DATA COLLECTOR 100-240V-AC TEST
NEW REXNORD 4705/06 MATOP 10FT LENGTH 59-3/4IN WIDTH CONVEYOR
VACUUM BLOWER D507960
NEW GUSHER 11019AH-A 230/460V-AC 5HP IRON CENTRIFUGAL PUMP
NEW ALLEN BRADLEY MPL-B580F-MJ22AA 460V-AC 26A 7.1KW 34NM SERVO
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NEW OMRON FZ3L355 FZ LITE CONTROLLER 24V-DC 4A AMP D353736
NEW CATERPILLAR CAT 7E-7859 ELBOW OFF-ROAD EQUIPMENT REPLACEMENT
NEW FAG FH40FE DOSIMETER 5-0003E PROBE ASSEMBLY GEIGER MUELLER
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ALLEN BRADLEY 1336-BDB-SP46D 1336STEF 460V-AC 600HP PCB GATE
ALLEN BRADLEY 22996-007-01 DIGITAL METER D467396
NEW WESTINGHOUSE 4256A91G03 PCB CIRCUIT BOARD D465202
ACRISON W105-F DRY SOLID VOLUMETRIC FEEDER B439343
VIBCO 2P-4500 3600 VPM 2HP 3PH 575V-AC 2A AMP 3450RPM VIBRATOR
NEW GOODYEAR 6200-20M-230 HAWK PD 6200MM 230MM 20MM TIMING BELT
NEW ASEA DSMB 110 57360001-A/8 MEMORY PCB CIRCUIT BOARD D496806
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NEW ABB IIMLM01 MODULE LOOP INTERFACE OIS MULTI-BUS PCB CIRCUIT
NEW WESTINGHOUSE 7379A62G01 PCB CIRCUIT BOARD D464455
GOULD AS-M485-008 REV B23 PCB CIRCUIT BOARD D480875
SICE 0210263B-A 4503028K HEAT SINK MODULE PRINTED PCB CIRCUIT
NEW DIGITAL EQUIPMENT H7660C 100/120V-AC POWER SUPPLY D491713
NEW RELIANCE 15FR4032 FLEXPAK 3000 DC 15HP 230/460V-AC 240/500V-
NEW ABB YXO 126 4890024-UN/2 ARMATURE OVERVOLT MONITOR PCB
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PEPPERL FUCHS 211968 HID MUX2700 HART 20.4-30V-DC MULTIPLEXER
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