6AV6643-0CB01-1AX1有三個(gè)A/O塊，分別是EM232、EM235、EM231。從模塊型號(hào)可看出，這三塊模塊模擬量輸出、模擬量輸入/輸出、模擬量輸入。模塊型號(hào)的第一個(gè)數(shù)字代表是西門子那個(gè)系列的PLC，2就是西門子200系列的PLC。中間那個(gè)數(shù)字代表模塊是數(shù)字量還是模擬量的，圖中所示模塊都是3，代表的是模擬量模塊。最后一個(gè)數(shù)字代表模塊是輸入還是輸出，1代表輸入、2代表輸出、5代表輸入和輸出（對(duì)于模擬量模塊而言的）。

然后還可以從模塊型號(hào)如EM232、EM235、EM231的下面，分別標(biāo)出AQ4、AI4/AQ1、AI4，那么就可以得知此的信息不僅僅是模塊屬于數(shù)字量還是模擬量模塊，還能知道模塊有幾路模擬量輸出或輸入。

例如EM232模塊標(biāo)識(shí)的AQ4，說明是模擬量輸出模塊，而且有四路輸出模擬通道。EM235模塊標(biāo)識(shí)的AI4/AQ1，說明此模塊即是模擬量模塊又是數(shù)字量模塊，而且有四路模擬量輸入通道，有一路模擬量輸出通道。EM321模塊標(biāo)識(shí)的AI4，說明是模擬量輸入模塊，有四路模擬輸入通道。比如，四路模擬輸入通道，意思就是可以接現(xiàn)場(chǎng)模擬量設(shè)備四臺(tái)，一路模擬量輸出，意思就是說可以給現(xiàn)場(chǎng)一臺(tái)執(zhí)行機(jī)構(gòu)提供模擬量信號(hào)。

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