desperately need simple sample programs or exercises for Step7 Professional

uptown47 said:

Just out of interest, is there a way of searching the library of SFC's in order to try and find one that's suitable for your needs or is it just a case of trawling through them all and reading the help file for each one.

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L D[AR2 said:

You can open a Data block as a DB or DI in your code irrespective of whether the Data Block was created as a DB or as a DI

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      OPN   DI [#DB_Number]
      L     DIW    0
      T     MW    10


      OPN   DB [#DB_Number]
      L     DBW    0
      T     MW    10

L D[AR2 said:

Dbw

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edda said:

So it doesn't matter if I open a shared DB as a instance DB and vice versa?

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L D[AR2 said:

Unless you are doing this inside an FB which relies on the instance DB number not changing....

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L D[AR2 said:

L DBLG gets the length of the data block opened with OPN DBxx
L DILG gets the length of the data block opened with OPN DIxx

You can open a Data block as a DB or DI in your code irrespective of whether the Data Block was created as a DB or as a DI

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L D[AR2 said:

I've used the trawl and try method.

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