S7-300/400 Series

SIMATIC S7 Ethernet

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S7-300/400 Series

Device	Bit Address		Word Address		32 bits	Remarks
Device	English	German	English	German	32 bits	Remarks
Data Block (OP Communication)	DB00001.DBX00000.0 - DB65535.DBX65535.7		DB00001.DBW00000 - DB65535.DBW65534
Input	I00000.0 - I00127.7	E00000.0 - E00127.7	IW00000 - IW00126	EW00000 - EW00126		^*1
Output	Q00000.0 - Q00127.7	A00000.0 - A00127.7	QW00000 - QW00126	AW00000 - AW00126		^*1
Marker	M00000.0 - M00255.7		MW00000 - MW00254			^*1
Timer	-----		T00000 - T00255			^2 ^3
Counter	-----		C00000 - C00255	Z00000 - Z00255		^2 ^3

^*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.

^*3Data Type is BCD.

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 area.
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