Technical data

Defining Symbols
8.4 Setting the Address Priority (Symbolic/Absolute)
Programming with STEP 7
Manual, 05/2010, A5E02789666-01 197
8.4 Setting the Address Priority (Symbolic/Absolute)
The address priority helps you to adapt the program code as you see fit when making changes in
the symbol table, changing parameter names of data blocks or function blocks or when changing
UDTs referring to component names or changing multiple instances
When making changes in the following situations, be sure to set the address priority carefully and
with a definite purpose in mind. In order for you to benefit from address priority, each change
procedure must be completed in itself before you start with another type of change.
To set the address priority, go to the SIMATIC Manager and select the block folder and then select
the menu command Edit > Object Properties. In the "Address Priority" tab, you can make the
settings that you deem appropriate.
Making optimal settings in address priority requires that the following situations for making a
change be distinguished:
• Correction of Individual Names
• Switching Names or Assignments
• New Symbols, Variables, Parameters or Components
Note
Please be aware that the absolute block number is the determining factor when making block calls ("Call FC" or
"Call FB, DB") for the logic block – even when symbolic address priority has been set!
Correction of Individual Names
Examples:
In the symbol table or in the program editor/block editor a spelling error in a name has to be
corrected. This applies to all names in the symbol table as well as to all the names of parameters,
variables or components that can be changed with the program editor/block editor.