99BProgramming concepts
6.9 Debugging and testing the program
S7-1200 Programmable controller
System Manual, 11/2011, A5E02486680-05
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Column
Description
Access
Type of access, whether access to the operand is read access (R) and/or write
access (W)
Address
Address of the operand
Type
Information on the type and language used to create the object
Path
Path of object in project tree
6.9.4
Call structure to examine the calling hierarchy
The call structure describes the call hierarchy of the block within your user program. It
provides an overview of the blocks used, calls to other blocks, the relationships between
blocks, the data requirements for each block, and the status of the blocks. You can open the
program editor and edit blocks from the call structure.
Displaying the call structure provides you with a list of the blocks used in the user program.
STEP 7 highlights the first level of the call structure and displays any blocks that are not
called by any other block in the program. The first level of the call structure displays the OBs
and any FCs, FBs, and DBs that are not called by an OB. If a code block calls another block,
the called block is shown as an indentation under the calling block. The call structure only
displays those blocks that are called by a code block.
You can selectively display only the blocks causing conflicts within the call structure. The
following conditions cause conflicts:
●
Blocks that execute any calls with older or newer code time stamps
●
Blocks that call a block with modified interface
●
Blocks that use a tag with modified address and/or data type
●
Blocks that are called neither directly nor indirectly by an OB
●
Blocks that call a non-existent or missing block
You can group several block calls and data blocks as a group. You use a drop-down list to
see the links to the various call locations.
You can also perform a consistency check to show time stamp conflicts. Changing the time
stamp of a block during or after the program is generated can lead to time stamp conflicts,
which in turn cause inconsistencies among the blocks that are calling and being called.
●
Most time stamp and interface conflicts can be corrected by recompiling the code blocks.
●
If compilation fails to clear up inconsistencies, use the link in the "Details" column to go to
the source of the problem in the program editor. You can then manually eliminate any
inconsistencies.
●
Any blocks marked in red must be recompiled.
