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Siemens TCP/IP Ethernet Driver Help

Internal Tags

Although the following internal tags are not visible in the server configuration, they can be browsed by the OPC

client. They can be found under the <Channel Name>.<Device Name>._InternalTags group. If the OPC client

does not support browsing, or if a non-OPC client is being used, the tags can be created dynamically and

statically by using the addresses given below.

Note:

The tags listed in the following table are valid for the S7-300, S7-400, S7-1200, and S7-1500 device models.

The default data types are shown in bold.

Device Address Description Range Data Type Access

_RACK Number of the rack in which the CPU of

interest resides.

On changing this device property, the

connection with the CPU is re-established.

0-7 Byte, Short Read/Write

_SLOT Number of the slot in which the CPU of

interest resides.

On changing this device property, the

connection with the CPU is re-established.

2-31 Byte, Short Read/Write

Standard S7-300/400/1200/1500 Item Syntax

Address Syntax

Input, Output, Peripheral, Flag Memory Types

<memory type><S7 data type><address><.string length>*

Timer and Counter Memory Types

DB Memory Type

DB<num>,<S7 data type><address>

DB<num>,<S7 data type><address><.bit>

DB<num>,<S7 data type><address><.string length>*

DB<num>,<S7 data type><address><[row][col]>

where <num> ranges from 1 to 65535.

*Applies to S7 data types that support string. String length can vary from 0<n<= 212, with the exception of S7

data type string (which can vary from 0<n<= 210).

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Siemens IP-Module Especificaciones Pagina 43