?與其它控制設(shè)備比較，PLC最重要的特征是“掃描”。PLC上電后，自動(dòng)重復(fù)執(zhí)行程序掃描和I/O掃描，即輸入采樣、用戶程序執(zhí)行和輸出刷新三個(gè)階段。完成上述三個(gè)階段稱作一個(gè)掃描周期。在輸入采樣階段，PLC以掃描方式依次地讀入所有輸入狀態(tài)和數(shù)據(jù)，并將它們存入I/O映象區(qū)中相應(yīng)的單元內(nèi)，輸入采樣結(jié)束后，轉(zhuǎn)入用戶程序執(zhí)行和輸出刷新階段，即使輸入狀態(tài)和數(shù)據(jù)發(fā)生變化，I/O映象區(qū)中的相應(yīng)單元的狀態(tài)和數(shù)據(jù)也不會(huì)改變。在用戶程序執(zhí)行階段，PLC按由上而下、先左后右的順序依次地掃描程序（梯形圖），根據(jù)邏輯運(yùn)算的結(jié)果，刷新RAM存儲(chǔ)區(qū)或I/O映象區(qū)對(duì)應(yīng)單元的狀態(tài)。在輸出刷新階段，根據(jù)I/O映象區(qū)內(nèi)對(duì)應(yīng)的狀態(tài)和數(shù)據(jù)刷新所有的輸出鎖存電路，再經(jīng)輸出電路驅(qū)動(dòng)相應(yīng)的外設(shè)，這時(shí)，才是PLC的真正輸出。可見，采用PLC程序控制的過(guò)程和結(jié)果與繼電器邏輯回路是有區(qū)別的，特別是涉及到梯級(jí)的次序、脈沖信號(hào)的捕捉等，與PLC的掃描原理是密切相關(guān)的。實(shí)踐中，大量的程序問(wèn)題均源于此，常常會(huì)出現(xiàn)不可思議的結(jié)果。因此，設(shè)計(jì)PLC程序，必須精通PLC的基本原理。全面提高程序的質(zhì)量，提高編程效率，使程序具有良好的可讀性、可靠性、可維護(hù)性以及良好的結(jié)構(gòu)，是每位程序設(shè)計(jì)者的目標(biāo)。IEC61131-3是國(guó)際電工委員會(huì)(IEC)于1999年推出的用于工業(yè)控制領(lǐng)域的標(biāo)準(zhǔn)化編程語(yǔ)言，具有開放性、可移植性、結(jié)構(gòu)化編程和結(jié)構(gòu)化數(shù)據(jù)、檢錯(cuò)和糾錯(cuò)能力強(qiáng)等特點(diǎn)，適用于plc編程。采用結(jié)構(gòu)化程序設(shè)計(jì)，便于構(gòu)造程序(尤其是復(fù)雜的程序)、多人設(shè)計(jì)，調(diào)試以及軟件管理。雖然軟件工程的思想已被絕大部分程序員所接受，但要將這種思想轉(zhuǎn)化為軟件開發(fā)過(guò)程中的自覺(jué)行為卻不是一件很容易的事。? CPU模塊主要由微處理器（CPU芯片）和存儲(chǔ)器組成。在PLC控制系統(tǒng)中，CPU模塊相當(dāng)于人的大腦和心臟，它不斷地采集輸入信號(hào)，執(zhí)行用戶程序，刷新系統(tǒng)的輸出；存儲(chǔ)器用來(lái)儲(chǔ)存程序和數(shù)據(jù)。S7-300/400將CPU模塊簡(jiǎn)稱為CPU。

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Tascam CDRW900SL CD Recorder/Player
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Mint Tascam MS-16 1″ Reel Tape Recorder complete
Comlete w/ meter bridge, manual, calib. tape, xtra tape

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Tascam RC848 DTRS Remote with Meterbridge and Stand

Alesis X2 24 recording mixer, tascam cable, mackie clip

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