Copying string in to a Datablock(Step7)

NoName · Aug 12, 2008

Hi all.

I wan't to copy a string message(160 characters) in to a Datablock from wich a SMS message(also 160 characters) is sent.
I've tryed to do this through VB script in WinCC flex but I just can't find the right function to do so. Is it even possible.
Or does it have to be done through a funcion block in Step7?

Any info would be great.

Best regards...
Ales

NoName · Aug 13, 2008

I have tryed this with moving data in Step 7.
I used the move command.
The string in the datablock is 160 characters long. And starts at addres dbb36. I've tryed moving characters to this address an so on to dbb196.
I see the change in a variable table, but if I open the datablock and monitor it there is no change :S.

I'm clueless as to why this is happening. Any ideas people???

Regards...
Ales

Kelkoon · Aug 13, 2008

Scf20

Hi NoName:

You can use SFC20 (BLKMV) to move a big block of data. I attach a image.

Kelkoon

L D[AR2P#0.0] · Aug 13, 2008

You cannot monitor a string variable in a DB. Continue using your VAT table or use an array of chars with two bytes at the front for the string max length/actual length. (NB: The array of chars will be shown "down the screen" so you will struggle to read all 160 chars "easily").

NoName · Aug 13, 2008

Thanks for the info guys. I've tryed with the block move function, but nothing changed in the destination datablock. The destination datablock is an instance datablock. I guess that this is relevant, beacouse nothing seems to alter the initial value of the string in this instance datablock.

I've entered like so:
SRCblk input: P#DB101.dbx2.0 byte 160 <--- this means that the block will move 160 bytes from dbx2.0 onwards, right?

DSTblk output: P#db100.dbx38.9 byte 160.

Correct?

Bratt · Aug 13, 2008

L D[AR2 said:
You cannot monitor a string variable in a DB. Continue using your VAT table or use an array of chars with two bytes at the front for the string max length/actual length. (NB: The array of chars will be shown "down the screen" so you will struggle to read all 160 chars "easily").

You cant see any changes online but you can see the latest string in the DB if you open the datablock online or switch from offline view to online view.

Bratt · Aug 13, 2008

NoName said:
I've entered like so:
SRCblk input: P#DB101.dbx2.0 byte 160 <--- this means that the block will move 160 bytes from dbx2.0 onwards, right?

DSTblk output: P#db100.dbx38.9 byte 160.

Correct?

P#db100.dbx38.9 byte 160.
This is wrong there is no such thing as dbx38.9 it stops at 38.7. enter 38.0 or 39.0

Check the hex value you get from retval. If its zero everything is ok if its another value click the block and press F1 to get information about the error

NoName · Aug 13, 2008

Sory typo... I ment 38.0.
The return value is 0 when I exectue SFC20. So there is no error. But the value in the instance datablock DB100 does not change.

Bratt · Aug 13, 2008

It should work.
How is tag set up in the original db and the instance DB?

Are you sure that you have data in the original DB.

It also possible that you overwrite the data from another place in the program.

If the tags are configured as String[160] you must add 2 bytes to the pointer P#DB101.dbx2.0 byte 162 or use symbolic addressing to move the complete string with the 2 starting length bytes.

Bratt · Aug 13, 2008

If you dont have the correct length in the length bytes you cant see the string even if you open the datablock online then you must use a VAT just like L D[AR2,P#0.0] pointed out.

Another note the googles is not enough you must switch between offline/and online view to see string. Menu datablock/file and "open online".

You cant monitor constant changes to strings this way you will only see the string that is currently present in the datablock. To see the new string you have to make another toogle between offline/online

NoName · Aug 13, 2008

Yes it works now. Thanks for the info guys.
Did as you said I added 2 bytes to the string lenght.

Copying string in to a Datablock(Step7)

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