TIA Portal Introduction
1.2 TIA Portal basics
STEP 7 Basic V10.5
Getting Started, 12/2009, A5E02651459-01
9
1.2.3 Data management
Central data management
In the TIA Portal, all data are stored in one project. Modified application data, such as tags,
are automatically updated within the complete project even across several devices.
Symbolic addressing across project parts
If you use a process tag in several blocks of various PLCs and in HMI screens, the tag can
be created or modified from any place in the program. In this case it is of no importance in
which block of which device you make the modification. The TIA Portal offers the following
options for defining PLC tags:
● Definition in the PLC tag table
● Definition in the program editor
● Definition by means of a link with the inputs and outputs of the PLC
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All defined PLC tags are listed in the PLC tag table and can be edited there. Modifications
are performed centrally and updated continuously. The consistent data management
eliminates the need for synchronization between the project participants within a project, for
example, between the programmer and the HMI designer.
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