1756-RIO
1． MMC卡作為CPU的裝載內(nèi)存（Load Memory），在為您的CPU選型MMC的時(shí)候，我們建議您所選的MMC卡一定要大于等于您所選定的CPU工作內(nèi)存的大?。╳ork memor在定購以上產(chǎn)品時(shí)，PLC本身不帶有MMC卡，所以為了正常使用PLC，您必須根據(jù)您工程項(xiàng)目實(shí)際需求定購一個(gè)大小適用的MMC卡，如果您的PLC上未插入MMC卡，你是無法將STEP7中的程序和數(shù)據(jù)下載下去的，同時(shí)你應(yīng)當(dāng)注意，不能帶電插拔MMC卡，否則會丟失程序或損壞MMC卡。
2． 在Simatic manager中，選擇一個(gè)程序塊下載，則該塊被下載到MMC卡中，如果在窗口左邊的樹型圖中選中Block文件夾進(jìn)行下載，則所有的塊被下載到MMC卡上，MMC中原有的信息將被覆蓋，向MMC卡讀寫數(shù)據(jù)或下載程序的次數(shù)不受限制。
3． 除過CPU中集成的SFB/SFCs塊外，MMC當(dāng)中其他的塊可被在線刪除。
4． 對某些CPU用新版MMC卡（6ES7 953-XXX10-0AA0）替代舊版MMC卡（6ES7 953-XXX00-0AA0）時(shí)需要升級PLC的OPERATING SYSTEM。升級時(shí)需要使用PG（6ES7798-0BA00-0XA0）或帶USB口的編程器（6ES7792-0AA00-0XA0），通過STEP7 MANAGER窗口中的菜單功能“PLC/UPDATE OPERATING SYSTEM”將CPU_HD.UPD文件寫到MMC卡上，CPU_HD.UPD文件可以在www4.ad.siemens.de網(wǎng)站上下載得到。
5． y），最好比工作內(nèi)存大一些，但如果您的應(yīng)用中，PLC工作時(shí)要使用大量的過程數(shù)據(jù)，歷史數(shù)據(jù)，配方數(shù)據(jù)等或控制工藝中存在較多的用戶程序塊、STEP7中的應(yīng)用功能塊（如FB41、FB42等）時(shí)，建議選用2－8M的MMC卡，但請注意只有314、315－2DP、C7系列的PLC支持8M的MMC卡。
6． MMC卡是裝載內(nèi)存，所以不能夠在上位機(jī)中的組態(tài)軟件中直接讀取MMC卡上的數(shù)據(jù)值（DB塊中的數(shù)據(jù)），組態(tài)畫面讀取的是PLC RAM內(nèi)存中的數(shù)據(jù)。
7． 在西門子的PLC上必須使用西門子專用的MMC卡，如下表中所列出的，不能使用數(shù)碼相機(jī)、移動(dòng)電話或PDA等數(shù)碼產(chǎn)品使用的通用型MMC卡。
The order numbers for MMC cards are in the following table：
Micro Memory Card / S7-300 Order number
64 Kbytes 6ES7 953-8LF11-0AA0
128 Kbytes 6ES7 953-8LG11-0AA0
512 Kbytes 6ES7 953-8LJ11-0AA0
2 Mbytes 6ES7 953-8LL11-0AA0
4 Mbytes 6ES7 953-8LM11-0AA0
8 Mbytes 6ES7 953-8LP11-0AA0
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1 - 10 Lead Time - Brand
1 - INCLUDES TRACKING GENERATOR
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1 ALPHA V DRIVE VDT080-MF1-4 LOW BACKLASH SERVO GEARHEAD
1 BALDOR ZD37D4A45-ERD AC ENCODERLESS VECTOR
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1 BRANSON/IPC 3 PCS PLASMA SURFACE TREATMENT SYSTEM
1 C-CAN RLW 114 (125V) TRACK SWITCHING POWER PACK NNB
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