6ES7416-2FK02-0AB0西門子6ES7416-2FK02-0AB0西門子

CPU的構(gòu)成
　　CPU是PLC的核心，起神經(jīng)中樞的作用，每套PLC至少有一個CPU，它按PLC的系統(tǒng)程序賦予的功能接收并存貯用戶程序和數(shù)據(jù)，用掃描的方式采集由現(xiàn)場輸入裝置送來的狀態(tài)或數(shù)據(jù)，并存入規(guī)定的寄存器中，同時，診斷電源和PLC內(nèi)部電路的工作狀態(tài)和編程過程中的語法錯誤等。進(jìn)入運(yùn)行后，從用戶程序存貯器中逐條讀取指令，經(jīng)分析后再按指令規(guī)定的任務(wù)產(chǎn)生相應(yīng)的控制信號，去指揮有關(guān)的控制電路。
　　CPU主要由運(yùn)算器、控制器、寄存器及實現(xiàn)它們之間的數(shù)據(jù)、控制及狀態(tài)總線構(gòu)成，CPU單元還包括外圍芯片、總線接口及有關(guān)電路。內(nèi)存主要用于存儲程序及數(shù)據(jù)，是PLC*的組成單元。
　　在使用者看來，不必要詳細(xì)分析CPU的內(nèi)部電路，但對各部分的工作機(jī)制還是應(yīng)有足夠的理解。CPU的控制器控制CPU工作，由它讀取指令、解釋指令及執(zhí)行指令。但工作節(jié)奏由震蕩信號控制。運(yùn)算器用于進(jìn)行數(shù)字或邏輯運(yùn)算，在控制器指揮下工作。寄存器參與運(yùn)算，并存儲運(yùn)算的中間結(jié)果，它也是在控制器指揮下工作。
　　CPU速度和內(nèi)存容量是PLC的重要參數(shù)，它們決定著PLC的工作速度，IO數(shù)量及軟件容量等，因此限制著控制規(guī)模。

鄭娟萍

廈門仲鑫航自動化設(shè)備有限公司

PLC的通信聯(lián)網(wǎng)
    依靠*的工業(yè)網(wǎng)絡(luò)技術(shù)可以迅速有效地收集、傳送生產(chǎn)和管理數(shù)據(jù)。因此，網(wǎng)絡(luò)在自動化系統(tǒng)集成工程中的重要性越來越顯著，甚至有人提出"網(wǎng)絡(luò)就是控制器"的觀點說法。
    PLC具有通信聯(lián)網(wǎng)的功能，它使PLC與PLC 之間、PLC與上位計算機(jī)以及其他智能設(shè)備之間能夠交換信息，形成一個統(tǒng)一的整體，實現(xiàn)分散集中控制。多數(shù)PLC具有RS-232接口，還有一些內(nèi)置有支持各自通信協(xié)議的接口。
    PLC的通信，還未實現(xiàn)互操作性，IEC規(guī)定了多種現(xiàn)場總線標(biāo)準(zhǔn)，PLC各廠家均有采用。
    對于一個自動化工程(特別是中大規(guī)模控制系統(tǒng))來講，選擇網(wǎng)絡(luò)非常重要的。首先，網(wǎng)絡(luò)必須是開放的，以方便不同設(shè)備的集成及未來系統(tǒng)規(guī)模的擴(kuò)展；其次，針對不同網(wǎng)絡(luò)層次的傳輸性能要求，選擇網(wǎng)絡(luò)的形式，這必須在較深入地了解該網(wǎng)絡(luò)標(biāo)準(zhǔn)的協(xié)議、機(jī)制的前提下進(jìn)行；再次，綜合考慮系統(tǒng)成本、設(shè)備兼容性、現(xiàn)場環(huán)境適用性等具體問題，確定不同層次所使用的網(wǎng)絡(luò)標(biāo)準(zhǔn)。

Varian 200/51 Gemini NMR Spectrometer Magnet 958220-05

SMC Air Valve Pneumatic 24VDC SOL NVS3135-0352D

YSI (Yellow Springs Instrument Co., Inc.) 42SC Handheld e-Thermomete?r

Global Specialties Proto-Board 203A

GE Fanuc IC693CPU311 5 Slot Base Module Chassis

Parker Hannifin MV-4-6214 High Purity Needle Valve New

Parker CASY-1594 BRAND NEW!!

Parker Partek CASY-1229 (MV-10) Special Valve Assembly

ASML/SVG 4022.435.24401 KV Automation Sensor Amplifier

ASML/SVG 4022.472.56861 Tempsens NTC ALU MF Water Assy.

AV Automatic Valve B8022-574-A

ASML 4022.471.7828 DEPA Board SVG

SMC Corporation NAR2550-N02B Regulator

Hewlett Packard 8507-0408 General Purpose Regulator

Johnson Controls P78ALA-9351 Dual Pressure Controller

ASML 4022.430.0336 CFT Engineering SCPM 7122 714 1800.2

ASML 4022.471.8188 AT WS PC Error board SVG

New LAM 715-028616-002 8 inch Plate

HP, Agilent Technologies 10833D Test Equipment GPIB/HPIB Interface Bus Cables

ASML 4022.471.7407 Module Card ID WC1R/WSM 3 SVG

ASML 4022.471.7409 Module Card ID W2R/WSE 4 SVG

Alca AE-27AB PN: 622-8729-001, Rev. D

Alca AE-37F-11 AE-37F MC PRCSR PN: 622-6741-011

Square D SY/MAX ROM-221R Analog Output Module

Parker PS2982B53P Solenoid Service Kit BRAND NEW!!

Cornell Dubilier 12-791985-00 12,000μf 350WVDC Capacitor New

March Mfg. Inc. TE-5C-MD Single Phase Magnetic Drive Pump

Tokyo Electron Limited Window UP, A-2 (DRM2)

Lytron 6220G1AN Copper Heat Exchanger

Sterling Transformer Corp. 4C18 TF5TXO3ZZ Aircraft Transformer

U.S. Filter Reverse Osmosis Water System, ROSEDALE FILTER 4

Powertronix AA-76656-F Toroidal Power Transformer 422808-115

ASML 4022.436.2676 R.R. Card SVG

SMC 3 Port Direct Operated Poppet Solenoid Valve NVKF334V-5D

Swagelok SS-43S6 Ball Valve

Tokyo Electron 885-97-000 RF Control

Sporlan MKC-260S Coil Solenoid Valve New

Air Products Gasguard 500 Gas Cabinet NEW 801-4700769

Star Linear Set Linear Bushings open type adjustable 1068-612-40

Gems Sensors RF-2500 Rotor Flow Rate Switch Monitor New

Wilkerson Company Particulate Filter F10-02-000, Manual Drain, ? NPT

Kuroda Pneumatic Solenoid Valve PCS 241

Cosel LDC60F-2 DC Power Supply LD Series

ASML 4022.470.2987 UPS Battery Unit 48VDC 60A SVG

L.E.A. Dynatech Int’l 054-00-0171 DCO Master Controller

L.E.A. Dynatech Int’l 054-00-0175 DCO Expansion Module

Universal Electric AB1F002 Pump Works 3390RPM

Norgren R07-200-RGKA General Purpose Regulator

Whitey, Swagelok, 1 Piece 40 series Ball Valve, 3/8", SS-44S6

Precision Medical Inc. 1MFA High-Flow Flowmeter Flow Meter 1MFA8005

Numatics Coalescing Filter ? NPT, w/ Metal Bowl and Drain F22D-02MQ

Andrew 6600D-2 Gas Distribution 2-Port Manifold

Watts ACV F115 Pressure Reducing Control Valve

BWD Auto Motive Corporation Oil Pressure Switch w/ Gauge GA25 6936, 881 CU

Alca UD-18M-1 UD-18M Alarm Display / Switch Unit

Stratex XP4 Series Microwave Antenna 840-204382-011

Applied Materials Ring Cover 300mm SST 0021-17770

ASML 4022.470.0663 REARPANEL HML SVG

ASML 4022.470.0665 SVG REARPANEL LO

ASML 4022.470.0666 SVG REARPANEL LL

SMC Solenoid Valve Direct Operated, 3 port, NC, 24VDC, SY114-5LOZ Lot of 10

STI Omron T5009 Universal Safety Interlock Switch

ASML/SVG 4022.471.6285 AT IM MHB ACT RP Board

Omron Corporation D4DS-1AFS Safety Door Switch

Tokyo Electron Transport Gas Panel Interface Analogic

Valmont Corporation CH1005 Commercial Food Cutter

ASML 4022.470.0669 SVG AT REARP.TM

Scherr Tumico 22-1500-1 14" Optical Comparator

BOC Health Care Ohmeda Tec 6 Desflurane Vaporizer Anesthesia

Woodhead 1A5006-34DN DeviceNET Mini Connector NEW

Tokyo Electron 27-1204-001 Housing, Ceramic TC SKT

Semiconductor Electronic Assembly Part Stainless Steel 50C103991E

Time Mark Corporation 2644 3-Phase Power Monitor C2644

Horner APG HE200CCU288 PLC Conveyor Controller

Stegmann Heavy Duty Incremental Encoder HD20-S01

Lucent Avaya 124D2 Frequency Generator 107869679

Tokin Noise Filter VU-215H-B

ASML 4022.437.06371 Video Adapter 13W3M to HD15F SVG

Pall Gaskleen 6101 Series Gas Filter GLF6101V04

ASML 4022.436.8512 Amplifier Module/card SVG

Ingersoll-Rand Type 30 V255 Compressor Pump

Omron Corporation D4NS-1BF Safety Door Switch

Markem 510 Top Surface Dual In-Line Marking Machine

Xinyuanyang S-72-24 24V 3A 72W Switching Power Supply 24V 3A 72W

Omron Corporation C200H-OD501 Output Unit Module

Omron Corporation SYSMAC C28H Programmable Controller C28H-C6DR-DE

Alca AE-78N-6 AE-78N Radio Display PN: 622-6731-006

ASML A 1075 PDS Interface ASSY 879-8125-003 Rev A SVG

Omron SYSMAC C200H Programmable Controller C200H-CPU01-E & C200H-ME831

E&M Inst. Physiograph Pressure Transducer Meters MK III Qty. 2

Quorum Weather Resistance Saftey Panic Dialer Strobe and Siren PD-105

National Controls, Inc. NCI 5835W Counting Scale

ASML 4022.470.0664 SVG REARPANEL CP

SMC Corporation CXSL15-50 15mm Cylinder

ASML 4022.470.0664 SVG REARPANEL CP

SMC Corporation CXSL15-50 15mm Cylinder

Hinge Clamp KF-25 Vacuum Fittings, ISO-KF Flange Size NW-25 Manufacture various

Bosch 0820224002 2-Position Base Mounted Air Valve

Pressure Vessel Electrical Single Level Float 18"

Opto 22 IAC5uad Pak Input Module

Applied Materials Upper Shield 8" Durasource TTN SST MA-17445, 0020-26312

GAST 1HAB-11T-M100X 2-Gallon Compressed Air System

ASHCROFT Q-8962 Pressure Gauge 100 PSI

MKS Instruments NW25 HPS Clamp 100312903

Generic 9892K13 Compressed Air Regulator

Wavelength RHM-4000 Precision Linear Heater Controller

GE Medical Systems 412682-003 3-Wire Multi-Link ECG Leadwire Set (Lot of 5) New

Edcor Sound Products System 2000 Wireless Microphone System S2000L

Hewlett Packard HP C7671A ScanJet Transparency XPA

SMC Corp. CXSM CXSM25 Dual Rod Hi Auto-SW Actuator CXSM25-100-Z73L

3Com 6852-10 EtherLink/MC TP

Quorum Weather-Resista?nt Panic Dialer Strobe and Siren PD-103

Marquette 405833-002 ECG EKG Replacement Cable

ASML 4022.472.2763 Service Normal Operation BPSA

Novellus Shield 17-291213-00 1000151707001

Kinetic Systems Vibraplane 1206-200-06 6 Inch Isolation

New LAM 605-092874-001 PCB DRAM SIMMS 16MB

Swagelok Quick Connects Key 1, QTM2-316, Male NPT

Mac 600 Series Control Valve 6113B-PM-501BA

Altronix ALTV248 CCTV Accessory Power Supply New

New 3B40-30 Type ISO WB MV Inpu

ASML/SVG 4022.428.14901 Rev. C

Snyder-Crown Industries Horizontal Water Storage Tank 110 Gallons & 10 inch top

Key High Vacuum Products Inc. SL-150 Valve

Industrial Timer Corp. C5 Reset Time Totalizer

Thornton 2000 2-Parameter Measurement System PN 6822-1

Fisher Scientific Labnet Micro7 Micro 7 Microcentrifuge Centrifuge Microfuge

Parker Flare Adaptor Male Straight 3/8 OD 3/4 NPT PFA, FAMS-612-T

Cole Parmer Instrument Company 7520-50 Masterflex Console Drive

Automation Direct D2-08TD1 8pt Sink Output Module

Opto22 IDC5Q DC Input Module

Eastern Air Brushless DC Motor DB31D-54

Omega Engineering CN9121A Microprocessor Based Temperature Controller and Box

ASML 4022.436.3685/M?otorola MVME 147-011 Board SVG

Parker Parflare PFA elbow connector FEC-6RF-T, 90 deg. 3/8" Redi-flare fittings

Eubanks Automatic Wire Marker-Stripper 67610-01 & Electric Wire Pre-fed 06215-05

Hard Manufacturing Co. Inc. Stainless Steel Standard Home Care Crib

Delta International Machinery Corp. 14-650 Type 2 Hollow Chisel Mortiser

Atlantic 6000 Vertical Jig-Borer Milling Machine Jig Borer

Narco Bio-Systems ESG-300 Electrosphygmog?raph

PB24312 Rev. A BM24312L01R/DS/?N9608883

Omron C200H-SP001 PLC I/O Spacer Modules Qty. 2