You can import tags using [Individual Device Settings]. The following procedure uses Siemens AG's SIMATIC S7 MPI direct connection driver as an example.
In the [Device-Specific Settings] (accessible from [Project] menu, [System Settings], [Device/PLC]), click the button for the device/PLC for which you want to use a tag.
Configure settings for a device/PLC.
Click [Browse] and select the project file (*.S7P) for the device/PLC.
If the project file contains multiple programs, a dialog box for program selection appears.
Select the program you want to import and click [OK].
A list of defined tags appears. Select the tags you want to import. You can select multiple tags. When done, click [OK] to import the tags.
You cannot use the following symbols in tag names: If a tag name contains any of these symbols, it will be converted to an underscore ( _ ).
. ,  # [space]
Review the tags you have imported and click [OK].
Specify a tag for an address. The following procedures shows how to setup a tag for [Monitor Word Address] on the display unit while Numeric Display is used.
Open the [Data Display] dialog box.
In the [Monitor Word Address] field, click to open the Input Address dialog box.
Select the tag you want to use, and click [Ent] to input an address.