Siemens SIMATIC S7 F Manual page 151

Programming
Result of the Comparison of the Safety Blocks (both programs offline)
An indication is given of whether the overall signatures across all blocks are
identical or different.
Difference Display, Block View:
Any blocks whose signatures have changed are displayed, along with the signature
of each. No task or run-time group information is available.
Difference Display, Chart View:
The differences between the two charts are displayed in a hierarchical structure, as
in Explorer. All the blocks in this structure are displayed under the assigned task
and run-time group. Information on possible differences is displayed for each block.
These differences refer to the task/run-time group in which the block is used, the
parameterization and interconnection of the block and the run sequence.
Only tasks, run-time groups, blocks and parameters in which differences were
found are displayed.
Fail-Safe Systems
A5E00085588-03
5-69