描述
用來(lái)連接FlashMemory和文件系統(tǒng)的程序都以文件形式存儲(chǔ)在Flash文件中,需要時(shí)可以裝入內(nèi)存,這種動(dòng)態(tài)的、根據(jù)需要加載的能力是支持其它一系列功能的重要特征。它能使初始化代碼在系統(tǒng)引導(dǎo)后被釋放。實(shí)際上,Linux同樣還有很多內(nèi)核外運(yùn)行的公用程序,這些程序通常在初始化時(shí)運(yùn)行一次,以后就不再運(yùn)行。而且,這些公用程序可以用它們相互共有的方式一個(gè)接一個(gè)地按順序運(yùn)行。這樣,相同內(nèi)存空間可以被反復(fù)使用以“召入”每一個(gè)程序,就象系統(tǒng)引導(dǎo)一樣。這樣可以節(jié)省內(nèi)存,特別是那些配置一次以后就不再更改的網(wǎng)絡(luò)堆棧。如果將Linux可加載模塊的功能包括在內(nèi)核里,驅(qū)動(dòng)程序和應(yīng)用程序就都可以被加載。由于它可以檢查硬件環(huán)境并且為硬件裝上相應(yīng)的軟件,從而消除了用一個(gè)程序占用許多FlashMemory來(lái)處理多種硬件的復(fù)雜性。另外,軟件的升級(jí)更加模塊化,可以在系統(tǒng)運(yùn)行時(shí)在Flashh上升級(jí)應(yīng)用程序和加載驅(qū)動(dòng)程序,其配置信息和運(yùn)行時(shí)間參數(shù)可以作為數(shù)據(jù)文件儲(chǔ)存在Flash中。
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主營(yíng):世界知名品牌的PLC、DCS系統(tǒng)備件模塊
①Allen-Bradley(美國(guó)AB)系列產(chǎn)品》
②Schneider(施耐德電氣)系列產(chǎn)品》
③General electric(通用電氣)系列產(chǎn)品》
④Westinghouse(美國(guó)西屋)系列產(chǎn)品》
⑤SIEMENS(西門子系列產(chǎn)品)》
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順序控制、梯形邏輯控制、事故追憶處理、數(shù)模轉(zhuǎn)換、輸入/輸出信號(hào)處理、數(shù)
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結(jié)構(gòu)的zui現(xiàn)代化的容錯(cuò)控制器。
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FESTO 161294 DZF-50-25-A-P-A Air Cylinder
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USSI N21260605 IN OUT Board Ansaldo
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Motorola MC25 FR6874-LCQSQ0C Phone Barcode Scanner DVT
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