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P0904BS依據(jù)出產(chǎn)技能懇求，斷定I/O點(diǎn)數(shù)和I/O點(diǎn)的類型（數(shù)字量、模仿量等），

并列出I/O點(diǎn)清單。進(jìn)行內(nèi)存容量的估量，恰當(dāng)留有余量。依據(jù)經(jīng)歷，關(guān)于

一般開(kāi)關(guān)量操控體系，用戶程序所需存儲(chǔ)器的容量等于I/O總數(shù)乘以8；關(guān)

于只要模仿量輸入的操控體系，每路模仿量需要100個(gè)存儲(chǔ)器字；關(guān)于既有

模仿量輸入又有模仿量輸出的操控體系，每路模仿量需要200個(gè)存儲(chǔ)器字。

斷定機(jī)型時(shí)，還要聯(lián)系商場(chǎng)狀況，調(diào)查PLC出產(chǎn)廠家的商品及其售后效勞、

技能支撐、網(wǎng)絡(luò)通訊等概括狀況，選定功用報(bào)價(jià)比好一些的PLC機(jī)型。
P0904BS 硬件規(guī)劃
依據(jù)所選用的PLC商品，了解其運(yùn)用的功用。按隨機(jī)供給的材料聯(lián)系實(shí)踐需

要，一同思考軟件編程的狀況進(jìn)行外電路的規(guī)劃，繪制電氣操控體系原理

接線圖。
4、軟件規(guī)劃
（1）軟件規(guī)劃的首要使命是依據(jù)操控體系懇求將次序功用圖變換為梯形圖

，在程序規(guī)劃的時(shí)分最好將運(yùn)用的軟元件（如內(nèi)部繼電器、守時(shí)器、計(jì)數(shù)

器等）列表，標(biāo)明用處，以便于程序規(guī)劃、調(diào)試和體系運(yùn)轉(zhuǎn)保護(hù)、修理時(shí)

查閱。
（2）模仿調(diào)試。將規(guī)劃好的程序下載到PLC主單元中。由外接信號(hào)源加入

測(cè)驗(yàn)信號(hào)，可用按鈕或小開(kāi)關(guān)模仿輸入信號(hào)，用指示燈模仿負(fù)載，通過(guò)各

種指示燈的亮暗狀況了解程序運(yùn)轉(zhuǎn)的狀況，觀察輸入/輸出之間的改動(dòng)聯(lián)系

及邏輯狀況是不是契合規(guī)劃懇求，并及時(shí)修正和調(diào)整程序，直到滿意規(guī)劃

懇求停止。

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