3/19/2014 8:36 AM | |
Joined: 10/7/2005 Last visit: 9/24/2024 Posts: 3022 Rating: (1054)
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Hello poya_xp DB's can for sure be deleted (as well a created) by the S7 program (see SFC22 and SFC23 for more on this). Deletion of an FB (or FC) is not possible via the S7 program as far as I know. It may though be possible/conceivable to use for example a seperate versioning program that contains automated backup/roll back features and have it take care of this (never tried this but in case a versioning program is in use on site it would be wortwhile checking). Also, someone with enough know how and evil intentions can of course abuse an available S7 online interface and do pretty much as he pleases in the PLC unless you have proper safeguards in place (be it addition of blocks, code alterations or deletion of blocks, unlikely, but certainly possible). Having said all of the above, my money is on an "accidental" online deletion of the Blocks by someone from Step 7. |
Last edited by: fritz at: 3/20/2014 9:22 AMCheers |
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