Siemens S7

[cartduty]

Hello everyone! I recently had a laptop stolen and had to upload some blocks. We have the original program but it has changed throughout the years. The problem is that when uploading all the variable names in the interface block are lost. Is there any way to restore these? or retype them in where the PLC will accept? Thanks in advance, Cartduty

[JesperMP]

Hello cartduty If you have an old backup somewhere with a partial or complete symbol table, then you can simply drag-and-drop the symbol table from the old to the new (uploaded) project. Another method is to use the compare function to determine the diffrence between an offline project (old) and online (new) project. If the differences are not so big, then simply replicate them in the old project manually. You will then get both symbols and comments from the old project with the code from the new project.

[cartduty]

Hello JesperMP, Thanks for the reply. However, it is the local variables in the FB's that I need restored. For example the variable name might be #out.conveyor_on but the new uploaded block shows #stat16.stat19 . This makes it very difficult to figure out what is what when there are 100+ variable names. I tried to copy and paste the old names into the uploaded block but I get an error saying there is a time stamp difference in the interface and the CPU may be put in stop mode. The associated DB also doesn't recognize the new names. I guess this should be a good lesson to always keep a current backup!! Thanks, Cartduty

[Groo]

Youll need to do JesperMP's 2nd option compare the blocks one at a time and manually change. You should always have back-ups of current files, preferably locked up in a safe.