點(diǎn)擊圖片查看大圖140U-PB現(xiàn)貨
隨著“制造2025”“互聯(lián)網(wǎng)+”“網(wǎng)絡(luò)強(qiáng)國(guó)”等戰(zhàn)略的深入實(shí)施，通信及自動(dòng)控制技術(shù)、傳
感技術(shù)等信息技術(shù)快速發(fā)展、不斷滲透應(yīng)用，“數(shù)字工廠”概念應(yīng)運(yùn)而生。
通信設(shè)備制造業(yè)迎轉(zhuǎn)型拐點(diǎn)
信息通信行業(yè)是國(guó)民經(jīng)濟(jì)基礎(chǔ)性、戰(zhàn)略性、先導(dǎo)性產(chǎn)業(yè)，對(duì)我國(guó)經(jīng)濟(jì)轉(zhuǎn)型升級(jí)有著重要的支撐作用，
而通信設(shè)備制造業(yè)為信息通信行業(yè)提供基礎(chǔ)設(shè)施，是其基礎(chǔ)性領(lǐng)域。
通信設(shè)備制造業(yè)呈現(xiàn)出以下特點(diǎn)：產(chǎn)業(yè)鏈鏈條清晰，產(chǎn)業(yè)規(guī)模和新產(chǎn)品市場(chǎng)空間以技術(shù)發(fā)展為爆發(fā)點(diǎn)
；需求方規(guī)模經(jīng)濟(jì)效應(yīng)突出；對(duì)其他行業(yè)出高滲透性；市場(chǎng)競(jìng)爭(zhēng)日趨加大，行業(yè)需求，利潤(rùn)
空間受到
) 臨時(shí)變量
臨時(shí)變量?jī)H在邏輯塊運(yùn)行時(shí)有效，邏輯塊結(jié)束時(shí)存儲(chǔ)臨時(shí)變量的內(nèi)存被操作系統(tǒng)另行 分配。S7將臨時(shí)變量定義在L堆棧中，L堆棧是為存儲(chǔ)邏輯塊的臨時(shí)變量而專(zhuān)設(shè)的。當(dāng)塊程序運(yùn)行時(shí)，在L堆棧中建立該塊的臨時(shí)變量，一旦塊執(zhí)行結(jié)束，堆棧重新分配，因而信息丟失。
邏輯塊局部數(shù)據(jù)的數(shù)據(jù)類(lèi)型
在變量聲明表中，要明確局部數(shù)據(jù)的數(shù)據(jù)類(lèi)型，這樣操作系統(tǒng)才能給變量分配確定的 存儲(chǔ)空間。局部數(shù)據(jù)可以是基本數(shù)據(jù)類(lèi)型或復(fù)式數(shù)據(jù)類(lèi)型，也可以是專(zhuān)門(mén)用于參數(shù)傳遞 的所謂的“參數(shù)類(lèi)型”。參數(shù)類(lèi)型包括定時(shí)器、計(jì)數(shù)器、塊的地址或指針等，見(jiàn)表5.2。表5.2 參數(shù)類(lèi)型變量
參數(shù)類(lèi)型 大 小 說(shuō) 明
定時(shí)器(Timer) 2 B 在功能塊中定義一個(gè)定時(shí)器形參，調(diào)用時(shí)賦予定時(shí)器實(shí)參
計(jì)數(shù)器(Counter) 2 B 在功能塊中定義一個(gè)計(jì)數(shù)器形參，調(diào)用時(shí)賦予計(jì)數(shù)器實(shí)參
塊：
Block_FB
Block_FC
Block_DB
Block_SDB 2 B 在功能塊中定義一個(gè)功能塊或數(shù)據(jù)塊形參變量，調(diào)用時(shí)給功能塊類(lèi)或數(shù)據(jù)塊類(lèi)形參賦予實(shí)際的功能塊或數(shù)據(jù)塊編號(hào)，如
FC 101、DB 42
指針(Pointer) 6 B 在功能塊中定義一個(gè)形參，該形參說(shuō)明的是內(nèi)存的地址指針。例如，調(diào)用時(shí)可給形參賦予實(shí)參P#M50.0，以訪問(wèn)內(nèi)存M50.0
ANY 10 B 當(dāng)實(shí)參的數(shù)據(jù)類(lèi)型未知時(shí)，可以使用該類(lèi)型
1) 定時(shí)器或計(jì)數(shù)器參數(shù)類(lèi)型
在功能塊中定義一個(gè)定時(shí)器或計(jì)數(shù)器類(lèi)型的形參，功能塊就能使用一個(gè)定時(shí)器或計(jì)數(shù)器，而不需明確具體的定時(shí)器或計(jì)數(shù)器，等到調(diào)用該功能塊時(shí)再確定定時(shí)器或計(jì)數(shù)器號(hào)。這使用戶程序能靈活性地分配和使用定時(shí)器或計(jì)數(shù)器。當(dāng)給定時(shí)器或計(jì)數(shù)器參數(shù)類(lèi)型形參分配實(shí)參時(shí)，在“T”或“C”后跟一個(gè)有效整數(shù)，如T 100。
2) 塊參數(shù)類(lèi)型
當(dāng)定義一個(gè)作為輸入輸出的塊時(shí)，參數(shù)聲明決定了塊的類(lèi)型(FB、FC、DB等)。當(dāng)為塊參數(shù)類(lèi)型形參分配實(shí)參時(shí)，可以使用物理地址，如FC 101，也可使用符號(hào)地址，如“valve
3) 指針參數(shù)類(lèi)型
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140U-PB
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140U-PB
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140U-PB
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