Technical data

Displaying Reference Data
14.1 Overview of the Available Reference Data
Programming with STEP 7
Manual, 05/2010, A5E02789666-01 313
Call Structure
The complete call hierarchy is displayed.
If the program structure is to be created for all organization blocks (OB) and OB1 is not in the S7
user program, or if a starting block was specified which is not present in the program, you are
automatically prompted to specify another block for the program structure root.
Display of multiple calls of blocks can be deactivated by option settings, both for the call structure
and for the dependency structure.
Displaying the Maximum Local Data Requirement in the Call Structure
To give you a quick overview of the local data requirement of the organization blocks in the user
program displayed, the following can be displayed in the tree structure:
• The maximum local data requirement per OB and
• The local data requirement per path
You can activate and deactivate this display in the "Program Structure" tab.
If synchronous error OBs (OB121, OB122) are present, a plus sign and the additional requirement
for the synchronous error OBs are displayed after the numerical value for the maximum local data
requirement.
Dependency Structure
The dependency structure shows the dependency of each block in the project on other blocks. The
block is displayed at the outer left and listed below in the indented segments are the blocks that call
or use this block.
Displaying Deleted Blocks
Lines relating to deleted blocks are highlighted in red color.