Preparing For Changes - Siemens SIMATIC PCS 7 Operating Manual

Changes, tracking changes, and acceptance

9.2 Preparing for changes

9.2 Preparing for changes
Offline/online comparison
Before each CFC change, make sure that the offline and online programs are identical.
● To do this, open a chart from the AS in the CFC editor and switch to online mode.
● If there are differences between the offline and online versions, a message with an
additional system prompt will appear; otherwise, the system will switch to online mode
without prompting.
In the case of fail-safe functions in the AS, you must also check whether the signature from
the last compilation matches the online signature in the AS (see Section Tracking changes in
the safety program (Page 178)).
● If the signatures are not identical, or a prompt indicating that there are differences
between the programs appears when you switch to online mode, you must determine
what has changed and whether these changes can be downloaded.
Version Cross Manager
The "Version Cross Manager" can be used as a tool for comparing two project versions, as
well as the current project with a backed-up version of it (see Section Tracking changes in
the safety program (Page 178)).
● The comparison function in S7 F-Systems can be used to list the differences in the safety
program. You can access this comparison function by clicking the "Compare..." button in
the "Edit Safety Program" window.
● The next window enables you to choose the versions to be compared.
Do not make any other changes if the offline and online versions are different and you do not
know what the differences are.
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Compendium Part B - Process Safety (V8.2)
Operating Manual, 07/2016, A5E35031794-AB