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八、PLC的通信聯網

依靠先進的工業網絡技術可以迅速有效地收集、傳送生產和管理數據。因此，網絡在自動化係統集成工程中的重要性越來越顯著，甚至有人提出"網絡就是控制器"的觀點說法。

PLC具有通信聯網的功能，它使PLC與PLC 之間、PLC與上位計算機以及其他智能設備之間能夠交換信息，形成一個統一的整體，實現分散集中控制。多數PLC具有RS-232接口，還有一些內置有支持各自通信協議的接口。

PLC的通信，還未實現互操作性，IEC規定了多種現場總線標準，PLC各廠家均有採用。

對於一個自動化工程(特別是中大規模控制係統)來講，選擇網絡非常重要的。首先，網絡是開放的，以方便不同設備的集成及未來係統規模的擴展；其次，針對不同網絡層次的傳輸性能要求，選擇網絡的形式，這在較深入地了解該網絡標準的協議、機制的前提下進行；再次綜合考慮係統成本、設備兼容性、現場環境適用性等具體問題，確定不同層次所使用的網絡標準。

JFW 50FHXC-004-50, 50FHXC00450, 50 Watts, 4 dB, Shipsameday w/2-3day 1642A2

General 6211-77-30E, 62117730E, Ship Same Day 1653A25

Nanaboshi 3 Pins, RM12BPE-3PH, 798-RM12BPE3PH71, Ship Same Day 1551D

LUMBERG RKCW-5/7, RKCW57, SHIPSAMEDAY 1557A3

SANDVIK 440-820200N93, 11 ME 00936534,SHIPSAMEDAY 1620Z

Viscoflo Lytron Heat Exchange, ES0510G14 With Comair Rotron 028869,

Coil 857-S1-W23, Shipsameday, 1559B22

SMC CDQ2B32-25D-A93L, CYL COMPACT With 2 Cable D-A73, SHIPSAMEDAY 1647B29

Allen Bradley Circuit Breaker 1491-SP, 1P, 1A, 1492-SPM1C010, 1217E

Flange ANSI Gasket EPDM 3 to 12, SHIPSAMEDAY, RACK L L92

Swagelok High-Pressure Coned CN4HM4MF20, HT744117, 20,000 PSI, SHIPSAMEDAYZS15

Swagelok High-Pressure Coned CN6MM4MF20, HT744729, 20,000 PSI, SHIPSAMEDAYZS16

SMC Manifold EX120-SMJ1 SV & VQ1101RY-5-X23 SHIPSAMEDAY 1617A

General Electric Manual Motor Protector Rotary 10-16A, 101245, GE-GPS1BHAM 109D

Omron V15G1C26K, V-15G-1C26-K, Ship SameDayShipping 1620A5

Bourns PM1008-82NK, M1187CT-ND, Lot Of 185, Shipsameday D10

SEMIKRON MODULE SKKD 170M19, SKKD17M19, 9644, Semipack, SHIPSAMEDAY 107D

HAM-LET Ball Valve 3/8 TUBE, H-700-SS-L-3/8-T-LD, H700SSL3/8TLD SHIPSAMEDAY D1

MURATA GRM36X7R331K050AQ

HELICOIL 5401-05, Thread Repair Kit, 7551-05

PARKER Male Connector 1/2 X 3/4-16 SAE/MS, 8-8 ZHBA-SS, Rack L L85

Matheson Regulator 19-350, W/2 Gauge, SST

Swagelok needle valve 1/4, SS-1RS4-SC11, SS1RS4SC11, SHIPSAMEDAY1606B2

Senso-Metrics Pressure Transducer SP70A, 10KG, Shipsameday 1541Z6

Senso-Metrics Pressure Transducer 601765, 10KPSI, Shipsameday 1327Z

Square D INTERLOCK DISCONNECT 9999-R-7, 9999-R7, 9999R7, Shipsameday 1641AC

SMC CDUJB8-20D-F8B, CDUJB820DF8B, Shipsameday 1177P

HUBBELL/BRYANT/COOPER TWIST LOCK HBL2723, HBL2621, HBL2513, L1520P, L14-30

SMC CDM2D2050AC73, CDM2D20-50A-C73, Shipsameday 1178F

Molex Ring Tongue Terminal 14-16 Awg, 0190700076, Rack D D17

Spectra Strip Amphenol Flat Cable 132-2801-026, Shipsameday 1472B

Johnson Controls Freezer Temperature Controller A419, A419ABC-1C, 125A6

CKD Solenoid Valve AMD21-10US-8, AMD2110US8, Shipsameday120Z5

SPI/Amtos parallel set 1/2 (5x), 5/8 (1X), 3/4 (1X), Shipsameday 1325A12

Square D 9999 PRV250 Varistor-Module 9999-PRV250 1556Q

SMC Cylinder CDM2RB32-150-H7A1, D-H7A1, SHIPSAMEDAY 1621F

Arlington NMLT125 Liquid Tight Connector, Shipsameday W/2-3dayship115X

UCV CTFE-SEAT 10K-1/4, 10K1/4, SUSF316L, Shipsameday W/2-3daysshipping AA25

PARKER 1/4 Npt X 5/16, 5-4CTX-SS

ABB S261D2 S261-D2 1P D2A 277V GHS261001R0021 ShipSameDay 1654A29

Reliance Electric 0-48652, 84543-108A, 48652-5, Shipsameday M2

SMC VVQ4000-25AR-1, VVQ400025AR1, Shipsameday W/2-3daysshipping 1642G

IFM IG5793, IGB3005-BPKG/US-100-DPS, Shipsameday, 1219P

Helical Flexible Shatf Coupling MC7C150-20-16, MC7C1502016, Shipsameday 1231A1

Power-Lok 65099 Lugs HD Comp Terminal 1/0 Gauge 5/16 Stud, 1537B

GE Control CR2943NA103G, 600V, NNB, Shipsameday115A11

Pfeiffer Wall Clamp, PF301110-T, DN63/100ISO (13X) & 3 No P/N 130A7