S7 - tricky one

[luccass]

Hi guys,
Simple question, but I cannot find simple answer to it:
How to read the instance DB symbolic name from within FB?

If this is not clear let me explain: I have a FB that operates on many DBs. Within every DB there is a variable defined (let's call it DB_name). What I need is the DB_name value to be the DB symbolic name (from symbol table).

Is it possible at all?

Thanks!

 

[uptown47]

Do you mean that you want to automatically write the symbolic name of a DB into the software based on a variable within that instance DB ??

 

[luccass]

Do you mean that you want to automatically write the symbolic name of a DB into the software based on a variable within that instance DB ??

Correct.

 

[L D[AR2P#0.0]]

Why ?

 

[uptown47]

The symbol table is 'offline' as such and I don't think its accessible from within the program. Why can't you just type them in? The symbol is only for the benefit of the programmer to help them identify what the DB does. As far as the code is concerned they aren't necessary.

 

[luccass]

Why ?

Wanted to automatically assign this value to alarm messages generated by the PLC.

edit:
****! Just realised there is only 12 bytes available for those values

 

[luccass]

[...] Why can't you just type them in? [...]

I can and looks like will have to do it, but don't like to type the same string twice

 

[cjd1965]

I don't like to type the same string twice

Use cut and paste