AB PLC变频器22B-A8P0F104

22B-A8P0F104

22B-A8P0F104

在S7 -200 SMART PLC中，数据是存于存储器中的，为了存取方便，需要对存储器的每个存储单元进行编址。在访问数据时，只要找到某单元的地址，就能对该单元的数据进行存取。S7 -200 PLC的寻址方式主要有两种：直接寻址和间接寻址。

1．直接寻址

1）编址

要了解存储器的寻址方法，须先掌握其编址方法。S7 -200 SMART PLC的存储单元编址有的规律，它将存储器按功能不同划分成若干个区，如I区（输入继电器区）、Q区（输出继电器区）、M区、SM区、V区、L区等，由于每个区又有很多存储单元，因而这些单元需要进行编址。PLC存储区常采用以下方式编址。

①I、Q、M、SM、S区按位顺序编址，如I0.0～I15.7、M0.0～M1.7。

②V、L区按字节顺序编址，如VB0～VB2047、LB0～LB63。

③AI、AQ区按字顺序编址，如AIW0～AIW30、AQW0～AQW30。

④T、C、HC、AC区直接按编号大小编址，如T0～T255、C0～C255、AC0～AC3。

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