6ES7416-2FK04-0AB0西門子6ES7416-2FK04-0AB0西門子

CPU的構成
　　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。進入運行后，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)定的任務產(chǎn)生相應的控制信號，去指揮有關的控制電路。
　　CPU主要由運算器、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)總線構成，CPU單元還包括外圍芯片、總線接口及有關電路。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，不必要詳細分析CPU的內(nèi)部電路，但對各部分的工作機制還是應有足夠的理解。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。運算器用于進行數(shù)字或邏輯運算，在控制器指揮下工作。寄存器參與運算，并存儲運算的中間結(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備有限公司

PLC的通信聯(lián)網(wǎng)
    依靠*的工業(yè)網(wǎng)絡技術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與上位計算機以及其他智能設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)場總線標準，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)絡非常重要的。首先，網(wǎng)絡必須是開放的，以方便不同設備的集成及未來系統(tǒng)規(guī)模的擴展；其次，針對不同網(wǎng)絡層次的傳輸性能要求，選擇網(wǎng)絡的形式，這必須在較深入地了解該網(wǎng)絡標準的協(xié)議、機制的前提下進行；再次，綜合考慮系統(tǒng)成本、設備兼容性、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)絡標準。

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Allen-Bradley A-B SLC 500 1746-P1 Power Supply Mainframe Chassis

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Ohaus Scale Corp. 700 Triple Beam Balance 2610g

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Kinney Vacuum Model II KDG-1 Discharge Gauge

Sorvall SS-34 Centrifuge Rotor 8 x 50 mL DuPont

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GE Medical Systems 2021197-002 Invasive Blood Pressure Care Cable

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Cardinal Health Pyxis Connect Plus ScanStation 120-08

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Screen SL-2210-FC-A Network Control Controller

Michael Riedel RT SNL 100 S Compact Power Transformer

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Crouzet Gordos PB-24 24-Channel I/O Module Rack Board

Anti Vibration Table 29.5 x 60.5 x 37.25 with Steel Top, w/ Pneumatic leveling

ASML/SVG 859-0984-004A

ASML/SVG 4022.471.6292 AT IM REM RES. RP Board

Swagelok Micro-Fit? 6LVV Tube fittings

Intermec Corp. Battery Charging Module with Battery New

Swagelok SS-63TSW16T-SC1?1 Valve

DRC Encoder Rotary 152-021-250-11U?F

Advanced Radiation Corp. 350 Watt Short ARC Lamp.

Honeywell Gamewell ADB-FLF Analog Detector Flanged Base New

T.E.M. Filter Company Gas Filter No. TEM-811-6

Bay Voltex Tempryte FT-0212-LT-WC Chiller

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Omron Corporation H3CA-A Solid-State Timer

Austria Solef AGRU PVDF-HP Reducer 80mm x 90mm

Cutler-Hammer Adjust. Frequency Drive AF91AGOB002D NEW

Varian Filament Control Card E15000051 Rev. 3