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5 PLC的網絡及發展趨勢

　　一個或若幹PLC與PC機聯出係統，PC機起到原編程器及人機界面操作站的作用，這20世紀90年代的新潮流，這樣為係統集成帶來了商機，同時編程軟件和人機界面軟件(監控軟件或稱組態軟件)及軟件接口(或稱驅動軟件)也得到了發展。

　　近年來，PLC廠家在原來CPU模板上提供物理層RS232/422/485接口的基礎，逐漸增加了各種通訊接口，而且提供完整的通訊網絡。由於近來數據通訊技術發展很快，用戶對開放性要求很強烈，現場總線技術及以太網技術也同步發展，所以PLC構成的PCS係統比DCS的開放性所處的現狀稍好一些。目前羅克韋爾AB公司已形成了多層結構體係，即Ether Net、Control Net、Device Net及Asi等現場總線(原DH+網也可兼容)。西門子公司在Profibus-DP通訊網絡及Profibus-FMS網絡以外，提出了S7 Routing網絡，即Profibus-DP和Industrial Enternet兩層結構。網絡還在發展，我國應已積極的姿態投入其中。

HUMPHREY Solenoid VALVE 24 Volts ,VV500AE1 3 10, VV500AE1310, SHIPSAMEDAY1611B

Ferrar Shawmut ULTRASAFE USM1, Y313944, ShipSameDay 1171N

Swagelok HOSE CONNECTOR 3/8 NPT, SS-6-HC-1-6, SHIPSAMEDAY1620P1

Swagelok/Parker 8AH-Q8CY-SSP 8AHQ8VY-SS SS-QC8-B-810 SEEDETAIL1620P6

ACME CONTROL TRANSFORMER 100VA, ET-83342, SHIPSAMEDAY

Bussman Time Delay Fuses, MDL1/32 1/32A MDL132, 1607AE

TE Conn D-sub Rcpt R/a 25 Pos, 5747846-5, A32127-ND, G32

NTI XTENDEX KVM Transmitter LOCAL UNIT, ST-C5KVM-L-600, with power adapter

TOPWORX PROXIMITY LIMIT SWITCH 750WATTS AT 480VAC, 147410, SHIPSAMEDAY 1328P4

Allen Bradley CIURCUIT BREAKER 2P, 7AMP, 1489-A2C070, BOX B 1600B38

Allen Bradley CIURCUIT BREAKER 2P, 10A, 1489-M2D100, BOX B 1600B39

Allen Bradley CIURCUIT BREAKER 3P, 10A, 1489-M3D100, BOX B 1600B41

Allen Bradley CIURCUIT BREAKER 3P, 5A, 1489-M3D050, BOX B 1600B42

Allen Bradley CIURCUIT BREAKER 1489-M2D150 & 1489-M2C100, BOX B1600B49

Asco Kit Valve 4810-01-257-8569, K302-678, DLA700-92-A-BB48/0021 1620A12

Phoenix Contact 2806862, IBSPRGCAB, 4501233018, ShipSameDay 1618B5

Panasonic Proximity Sensor Panadac-918D, Panadac918D, SHIPSANEDAY, N78

Panasonic Photo Sensor N310P9211, PANADAC-921A-1, PANADAC921A1, Shipsameday N86

Sharp Optoisoltr 5kv 4ch, PC847X5J000F, 425-2596-5-ND, Lot Of 25, H5

Electrical Cord Water & Resistant Wire 8Awg, 4/C, shipsameday, Rack D D109

Samtec Conn Socket Strip Skt 26pos, CLP-113-02-F-DH, CLP11302FD

Bussmann Low-peak LPS-RK-50SPI, LPSRK50spi, Shipsameday 1553C3

Dwyer Flowmeter RMA-22, RMA22 With SMC Fitting 3/8 Shipsameday 1635Z

Blue-White Flow Meter, F-44375L-8 & F-44376L-8, 1/2 MNPT, 1-5 GPM,

Kurt J Lesker Feedthroughs 1.33 CF Flanged, TFT3JP00002, 1370M

Eagle Signal CG2H6, 120V 50/70Hz, 10Amp, Shipsameday 1174M

Turck cable PKG 3M-2, PKG3M2, U2516-59, SHIPSAMEDAY 138H

Turck BSF 8-8-1/14.5/NPT, U-52051, SHIPSAMEDAY138P

Swagelok FITTING 1/2 FVCR X 3/8 FNPT, SS-8-WVCR-7-6, SHIPSAMEDAYZJ3

SMC VF3140, No Gasket & Screw, ShipSameDayWith2-3DaysShipping 1651B12

SMC NVFS3300-3FZ, NVFS33003FZ, Ship Same Day With 2-3 Days Shipping 1651B8

SMC CDG1WBN50-50, CDG1WBN5050, ShipsAmeday 123H

SHROUDED HEADER 20 POS STRAIGHT, 2520-6002UB, SHIPSAMEDAY AA38

BRYANT ANGLE NYLON PLUG 30A, 2P, 125V, 3WIRE, 9530-ANP, SHIPSAMEDAY

Parker Veriflo BELLOWS VALVE 1/4 FVCR, 944A0PLPNCSFSFFM, SHIPSAMEDAY128B4

GE FANUC INPUT MODULE 5-50 VDC, IC600YB811A, SHIPSAMEDAY RACK D D77

Swagelok Particulate Filter 1/4, 15 Micron, SS-4TF-15, SHIPSAMEDAY126E2

Honeywell SENSOR PRESS VAC GAUGE 100PSI, 19C015PV2K, SamedayShipping1474AR

HONEYWELL MICRO SWITCH PHOTOELECTRIC CP18RBAD2 ShipSameDay W/2-3DaysShip1615A10

Welwyn Resistor 2W, Metal Film 180K Ohm, MFP2-180KJI, X23

EATON EMO STOP Pushbutton, E22LTA2N123, E22MGTA, Shipsameday1172P4

Vickers Coil 503698, 110/115-50/60Hz, Shipsameday W/2-3daysshipping 1329R