P0917HB FBM221 備件

P0917HB FBM221 備件

經(jīng)驗設(shè)計法一般適合于設(shè)計一些簡單的梯形圖程序或復(fù)雜系統(tǒng)的某一局部程序（如手動程序等）。如果用來設(shè)計復(fù)雜系統(tǒng)梯形圖，存在以下問題：

   1)．考慮不周、設(shè)計麻煩、設(shè)計周期長

  用經(jīng)驗設(shè)計法設(shè)計復(fù)雜系統(tǒng)的梯形圖程序時，要用大量的中間元件來完成記憶、聯(lián)鎖、互鎖等功能，由于需要考慮的因素很多，它們往往又交織在一起，分析起來非常困難，并且很容易遺漏一些問題。修改某一局部程序時，很可能會對系統(tǒng)其它部分程序產(chǎn)生意想不到的影響，往往花了很長時間，還得不到一個滿意的結(jié)果。

  2)．梯形圖的可讀性差、系統(tǒng)維護(hù)困難

用經(jīng)驗設(shè)計法設(shè)計的梯形圖是按設(shè)計者的經(jīng)驗和習(xí)慣的思路進(jìn)行設(shè)計。因此，即使是設(shè)計者的同行，要分析這種程序也非常困難，更不用說維修人員了，這給PLC系統(tǒng)的維護(hù)和改進(jìn)帶來許多困難。
邏輯設(shè)計法
在進(jìn)行程序設(shè)計時以布爾邏輯代數(shù)為理論基礎(chǔ)，既以邏輯變量“0"或“1"作為研究對象，以“與"、“或"、“非"三種基本邏輯運(yùn)算為分析依據(jù)，對電氣控制線路進(jìn)行邏輯運(yùn)算，把觸點(diǎn)的“通、斷"狀態(tài)用邏輯變量“0"或“1"來表示具有多變量的“與"邏輯關(guān)系表達(dá)式可以直接轉(zhuǎn)化為觸點(diǎn)串連的梯形圖。如圖2(a)所示。
具有多變量的“或"邏輯關(guān)系表達(dá)式可以直接轉(zhuǎn)化為觸點(diǎn)并聯(lián)的梯形圖。如圖2(b)所示。
具有多變量“與或"、“或與"邏輯關(guān)系表達(dá)式可以直接轉(zhuǎn)化為觸點(diǎn)串并聯(lián)的梯形圖。

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Toray Engineering LC-800 Oxygen Analyzer, High Functionality

2 AMAT 0190-35791 MUXADIO-001 Seriplex multiplexed ADIO boards

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STEC SEC-4400M MFC, 200 sccm SiF4

Francotyp Postalia 20010307 Head Control PCB 

12 Position gas manifold W/ Mott filters, Tescom Pneumtic valve, Nupro valve

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Connect Tech 65830 Blue Heat/PCI8 REV D, PCI Card serial card

1 Lamp 388 Indicator M01268-CQ-11-02O

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CH Products 292-00028-00 Joystick

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Keithley DAS-50, PC7022, DAS-5014, DAS-50 PC7012, Memory board, PCB

Zygo Servo Amplifier card 291-00187-01, 260-00094-01 ASSY, 398388

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