### S7-300/400 Series

Device | Bit Address | Word Address | 32 bits | Remarks
--- | --- | --- | --- | ---
English | German | English | German
Data Block | DB00001.DBX00000.0-DB65535.DBX65533.7 | DB00001.DBW00000-DB65535.DBW65532 |  | *1
Input | I00000.0-I00127.7 | E00000.0-E00127.7 | IW00000-IW00126 | EW00000-EW00126 |
Output | Q00000.0-Q00127.7 | A00000.0-A00127.7 | QW00000-QW00126 | AW00000-AW00126 |
Internal Marker | M00000.0-M00511.7 | MW00000-MW00510 |
Timer | - | T00000-T00255 | *2
Counter | - | C00000-C00255 | Z00000-Z00255 | *2

*1When you write the bit address, the Display reads the word address corresponding to that of the External Device first. Change only the target bit address among the word data once read, and write the word data to the External Device.
Note that the correct data may not be written if you change the word address value in the ladder program while the Display reads the data of the External Device and writes it to the External Device.

*2Write disable

NOTE

- The size of the address area used by BLUE's STRING variable depends on the device that is set.
  Data Block device: Same specification as the STRING data type of the External Device. When Number of byte is set to 10, the driver uses a 12-byte address space.
  Other than Data Block device: Use the address area as set by the number of bytes in the STRING variable.
- Please refer to the precautions on manual notation for icons in the table.

Supported Devices Symbol and Terms