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廈門(mén)市思明區(qū)湖濱東路湖光大廈8樓A座
一般來(lái)講，控制系統(tǒng)網(wǎng)絡(luò)可分為3層：信息層、控制層和設(shè)備層(傳感/執(zhí)行層)。傳統(tǒng)的控制系統(tǒng)在信息層大都采用以太網(wǎng)，而在控制層和設(shè)備層一般采用不同的現(xiàn)場(chǎng)總線或其他專(zhuān)用網(wǎng)絡(luò)。目前，以太網(wǎng)已經(jīng)滲透到了控制層和設(shè)備層，很多的PLC和遠(yuǎn)程I/O供應(yīng)商都能提供支持TCP/IP的以太網(wǎng)接口的產(chǎn)品。以太網(wǎng)之所以給自動(dòng)化市場(chǎng)帶來(lái)風(fēng)暴式的革命，主要有3個(gè)原因：低成本的刺激和速度的提高；現(xiàn)代企業(yè)對(duì)實(shí)時(shí)生產(chǎn)信息有越來(lái)越多的要求；以太網(wǎng)的開(kāi)放性和兼容性。
早期的以太網(wǎng)，多節(jié)點(diǎn)共享同一個(gè)傳輸媒體，稱(chēng)為共享以太網(wǎng)(Shared Ethernet)，節(jié)點(diǎn)間通信采用廣播方式，易發(fā)生沖突。共享以太網(wǎng)用CSMA/CD技術(shù)來(lái)避免沖突，即發(fā)送方檢測(cè)到?jīng)_突就暫停發(fā)送，隨機(jī)延遲一段時(shí)間后再重新發(fā)送直到成功。由于延遲時(shí)間是隨機(jī)的，不能事先知道，因而共享以太網(wǎng)的時(shí)間響應(yīng)具有不確定性，不能用于強(qiáng)實(shí)時(shí)性場(chǎng)合。
交換以太網(wǎng)(Switched Ethernet)的出現(xiàn)克服了這一缺點(diǎn)，以太網(wǎng)的交換機(jī)(Switch)是數(shù)據(jù)鏈路層(ISO/OSI參考模型第二層)的多端口網(wǎng)橋，也可以說(shuō)是智能分配器。交換機(jī)將其管理的網(wǎng)絡(luò)以星型拓?fù)浣Y(jié)構(gòu)劃分為許多物理上互相隔離而邏輯上互相聯(lián)系的節(jié)點(diǎn)，每一節(jié)點(diǎn)單獨(dú)與交換機(jī)建立物理連接，在通信的時(shí)候交換機(jī)會(huì)在發(fā)送端口與接受端口間建立一個(gè)獨(dú)占的全雙工通道，它具有以太網(wǎng)的全部帶寬并避免沖突。
Armstrong 7/64" Mech Less Bkt
Armstrong 3/16" Mech Less Bkt
Armstrong 5/32" Mech Less Bkt
Armstrong Pressure Change Assembly 0-15 LBS #213, 813, 983, 313, 413, 883, 863
Armstrong 1/8" Mech Less Bkt
Allen-Bradley 800E-3DL0 Full Voltage Module with Latch Series B
Brady R4410R Portable Thermal Ribbon Red
Moore Wallace Z1093 Wax-CSO Ribbon
KYTronics KYT-2114 Card Dispenser
Acopian 15E10 Power Module A.C. to D.C.
Guardian Electric A420-065453-00 Solenoid
Cognex 371-0389-6 Lens Assy 60mm
CKE S05DA51UC Suppressor
GE CR305X100A Auxiliry Contact 600V
Allen-Bradley 1492-SM5X12 Plastic Markers Series B (Box of 5)
Wiremold 818 External Elbow Ivory (Box of 10)
Wiremold 810A1 NM Entrance End Fitting
Wiremold 2348-2 Sure-Snap NM 2-Gang Device Box Ivory
International Navistar 1689490C91 Cable 28 1/2" Long
1LTW9C Square Head Plug 1/2" 304 Stainless Steel
Buna 568-234 O-Rings (Bag of 35)
Buna 568-244 O-Rings (Bag of 5)
Chesterton 1725 DF Die Form (1 Set of 4 Rings)
phd 3394-02-1 Seal Kit (NEW)
Meyer 13004 Sector/Shear Pin 3/4"
Electronic Speed Control Petal Assembly
Newman C54414E020 Sanitary Gasket 51mm (Bag of 4)
Baker Material 708858 36V switch
Keller Tools K-297554 Air Tool
Coil 5661D1121
Coil COO-376-2523
GE H3500GA Power Tech S/F Transient Suppression 120V
Lea International DS-MEP20-277/480-50-34 Surge Suppressor (Knob Not Attached)
Parker Parflex UM4X2.5-ORG-0100 4mm Orange Urethane Tubing (Box of 100 ft)
Cutler-Hammer C383TJ90 90-Pole Jumper Bar (Box of 9)
Rexroth 3 842 532 364 Gelenk Joint
Moritex MML6-110D Coaxial Optical Lens
Harting RJ Industrial 0945 225 1107 Straight Plastic Gender Changer
Clark 4303647 Forklift Brake Shoe Set
Clark 999052 Forklift PMT Unit
Gas Station Pump Identification Placard (Box of 2)
MTI T50064-39 Gas Station Pump Keypad Cover Label
MTI T50064-1131 Gas Station Pump Keypad Cover Label
Parker Parflex UM8X5-BLK-0500 8mm Black Metric Urethane Tubing (Box of 500 ft)
Yale 5106590-01 Packing Kit
Crown 73338 Actuator (Box of 2)
Clark 897024 Spring Set (Box of 8)
Crown 60009-20 Retaining Ring
Cat Eye RR-272-WZ Reflector Orange
Allen Bradley 855P-B10LEM22 Panel Mount Sounder
AT&T 107152100 500A1-003 One Touch Headset Adaptor
CompAir A204-1366 Oil Sample Kit (NIB)
Sun 370-1678-01 Microphone II
Scott-O-Vista 803923-02 Full Facepiece Assembly (Large)
Earmark VAS-2 Loud Mouth Voice Amplification System
North 28-45-40 Headphone
Bilsom 2424-02 Warrior Headphone
Peltor OPTIME 95 Headphone
Remote Control Lot (Approximately 12 Pieces)
Cabot Safety Corp. 1720 Headphone
North 28-45-40 Headphone (Used)
Avaya KS23822-L12 Headset Base Unit
AT&T 106058340 S203A-003 Speakerphone Module
Radiator Specialty Co. G-236 Anchor Bowl Ring
Lucent 108365164 500AM One Touch Headset Adapter
Avaya M12LU/CM Headset Amplifier (For Parts Only)
Avaya KS23822-L12 Headset Base Unit (For Parts Only)
Manning, Maxwell, & Moore K-315-1 Budgit Hoist (2 Ton)
Wright C-RB Roller Bearing Trolley (1 Ton)
Adobe 22001438 Acrobat 5.0
Extron System 10 Plus 10-Input Configurable Switcher with Projector Control
Extron System 8 Plus 8-Input Switcher with Projector Control
MTI T18724-32 Gas Station Pump Keypad Cover Label
MTI T18724-1069 Gas Station Pump Keypad Cover Label
MTI T18724-49 Gas Station Pump Keypad Cover Label
MTI T50064-21 Gas Station Pump Keypad Cover Label
MTI T50064-1041 Gas Station Pump Keypad Cover Label
MTI T18724-82 Gas Station Pump Keypad Cover Label
MTI T18724-32A Gas Station Pump Keypad Cover Label
EU03004G117 Gas Station Pump Keypad Cover Label
MTI T50064-03 Gas Station Pump Keypad Cover Label
MTI T18724-49A Gas Station Pump Keypad Cover Label
MTI T18724-51 Gas Station Pump Keypad Cover Label
MTI T50064-1049 Gas Station Pump Keypad Cover Label
MTI T18724-1096 Gas Station Pump Keypad Cover Label
MTI T18724-70 Gas Station Pump Keypad Cover Label
MTI T50064-70 Gas Station Pump Keypad Cover Label
MTI T18724-1049 Gas Station Pump Keypad Cover Label
MTI T50073-01 Gas Station Pump Keypad Cover Label
MTI T18724-21 Gas Station Pump Keypad Cover Label
MTI T18724-94 Gas Station Pump Keypad Cover Label
MTI T18724-54 Gas Station Pump Keypad Cover Label
MTI T19003-08 Gas Station Pump Keypad Cover Label
MTI T18724-1052 Gas Station Pump Keypad Cover Label
MTI T50064-1009 Gas Station Pump Keypad Cover Label
MTI T18724-73 Gas Station Pump Keypad Cover Label
MTI T18724-53 Gas Station Pump Keypad Cover Label
MTI T50064-53 Gas Station Pump Keypad Cover Label
MTI T50136-17 Gas Station Pump Keypad Cover Label
MTI T18724-17 Gas Station Pump Keypad Cover Label
ENS0301G002 Gas Station Pump Keypad Cover Label
DEC ADV1PPU-87 Gas Station Pump Price Placard 87 Octane
DEC ADV1PPU-89 Gas Station Pump Price Placard 89 Octane
DEC ADV1PPU-88 Gas Station Pump Price Placard 88 Octane
DEC ADV1PPU-DI Gas Station Pump Price Placard Diesel Octane
DEC ADV1PPU-92 Gas Station Pump Price Placard 92 Octane
DEC ADV1PPU-90 Gas Station Pump Price Placard 90 Octane
DEC ADV1PPU-93 Gas Station Pump Price Placard 93 Octane
Gil R60030-G3 Optimum Octane Labels (2) 87, (2) 89, (2) 92 Octane
Pioneer 235076 Stanzoil TRI-PLY Milled Neoprene Gloves (Box of 7 Pairs)
Hubbell RACO 5A049A Ceiling Box Cover 4" (Box of 28)
Northeast Industries SS301 Pressure Washer
Danco 96750 #36 O-Ring 5/16" OD x 3/16" ID x 1/16" (Pack of 10)
bondo 357 Plastic Spreaders (Pack of 3)
Service First GKT03432 Gasket 0.09 T x 0.50 ID x 3.00 OD
Ingersoll-Rand CPM-10043 Motor Pump Shaft Seal
Base-Lock Rubber Type Co. Inc. F11 Figure Font
ACE Controls, Inc. 1525-400 Complete Seal Kit
Century Spring Corp. 80985 Extension Spring (Pack of 2)
Scott Rotary Seals, Inc. 200-045-25 Lip Seal
22296592 Pneumatic Release
Industrial Face Shield Visor Lot (Approximately 63 Pieces)
Industrial Face Shield Hardware Lot (Approximately 13 Pieces)
Industrial Safety Glasses/Goggles Lot (Approximately 33 Pieces)
Parker PS110 Repair Kit
Hoffman U-707676 Industrial Control Panel Enclosure
Alarm Controls Corp. RP-44 Remote Plate
Dukane 438-761A Auxiliary Input PWB Kit
Dukane 437-00109 Pro Care 6000 Firmware
Ellwood Safety 702 Toe Guard (Set of 2)
Creform YK200U Bolt-On Fixed Caster with 200 x 42mm Polyurethane Wheel
RJS 002-8119 Barcode Verifier
Protectoseal 522 Vertical Drum Safety Vent for 30 & 55 Gallon Drums
Protectoseal 522 Vertical Drum Safety Vent for 30 & 55 Gallon Drums (NIB)
TOA Corp. F-121CM Ceiling Speaker System
Bell-Mark EasyPrint Thermal Transfer Printer 230/115V
Square D 9001-SKYP10 Pendant Control Station
Panasonic PID8 Videolarm Indoor Domed Housing (New, Open Box)
Morse Industrial Products ANSI 60-1 CP Standard Duty Roller Chain 160
Pelco CM400 Corner Mount Adapter
Hubbell B2436 Dualevel Cast Iron Adjustable Floor Box
American Time & Signal E45BADD501 Clock
Telex BTR-300 71276-712A Single Channel VHF Wireless Intercom Base Station
Panasonic PID8 Videolarm Indoor Domed Housing
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