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西門子PLC300。上位（vb)從PLC讀上來的數(shù)據(jù)是倒的？或者說，PLC存儲(chǔ)器高低位和別人的是反著的？見下。謝謝

這是上位要往PLC寫數(shù)據(jù)之前的操作，需要把數(shù)據(jù)倒過來一下。

CopyMemory pReadBuffer1(0), a, 4

pReadBuffer(0) = pReadBuffer1(3)
pReadBuffer(1) = pReadBuffer1(2)
pReadBuffer(2) = pReadBuffer1(1)
pReadBuffer(3) = pReadBuffer1(0)

MyHex = field_write_ex6(100, 2, 20, 12, 12, pReadBuffer(0))

求介紹西門子存儲(chǔ)器 是倒著的 詳細(xì)學(xué)習(xí)資料（網(wǎng)址也可喲）謝謝！
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嘎嘎，一般都是反的，以前用PLC讀CNC的數(shù)據(jù)也是反的