S7-200 subroutine output?

[Gazzr]

Could somebody tell me why the subroutine in my attached program does not return the expected result. Basically what I want to do is convert 2 numeric bytes from seperate locations into a string. but seperate the 2 numbers with a "-" once in the string. I have almost got it right, but the last step to transfer the string out of the subroutine and into a location doesn't seem to work.... Must be something and nothing, but it beats me...? Thanks in advance. combine_bytes_to_string.rar Edited April 27, 2007 by Gazzr

[504bloke]

Ill throw you a bone...... In your subroutine look at your local variable table Edited April 28, 2007 by 504bloke

[Gazzr]

I'm guessing that you mean look at the local variable table because LB2 is set to byte rather than string. But it doesn't let me select string.... I have no idea why though as the option is there in the drop down list.

[504bloke]

I dont think you can pass a string out which is why you cannot select string, as you have selected byte insted this is why your subroutine isnt working on the output. I have searced siemens help and can find no reference to it though. All i think you can do is forget the OUT and just put the string in a variable say VB230 or something, that works ok.