How to automatic update file sld when the bus number in file sav changing

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It's easy. All SLD's that are opened will automatically be updated when you change the bus number in file .sav. You have to save the diagram afterwards.

When changing the bus number with the python API, you need to use the following function:

renumdiagfile(trnfile)

where the trnfile is a text file in the form:

OLDBUSNUMBER, NEWBUSNUMBER

Eventually, you shall save the file. These other two functions may be of useful:

opendiagfile(sfile) savediagfile(sfile)