MID instruction not working

hazemabdulrab · Nov 7, 2014

Hello ,

I'm having an issue with this rung. I've tried with and without ONS and I can't seem to understand why it wont work.
and yes the routine is added as a JSR in the main routine.

any ideas?

Thank you

danatomega · Nov 7, 2014

I would try a jumper around your NEQ to see if that's causing the issue. Not sure you can compare NEQ a string to null_string.

hazemabdulrab · Nov 7, 2014

danatomega said:
I would try a jumper around your NEQ to see if that's causing the issue. Not sure you can compare NEQ a string to null_string.

I tried that as well and still no luck. I know the rung is true because I tried putting a copy instruction at the end and it worked fine

danatomega · Nov 7, 2014

Well, maybe the source string length is not set properly. How did you get the data into that string?

hazemabdulrab · Nov 7, 2014

danatomega said:
well, maybe the source string length is not set properly. How did you get the data into that string?

I'm copying the data and length from the barcode reader tags

danatomega · Nov 7, 2014

That all looks good - I'm just about out of ideas. Have you tried substituting another simple non-arrayed string as the source? Do you have a similar MID function working in another section of your program?

hazemabdulrab · Nov 7, 2014

danatomega said:
That all looks good - I'm just about out of ideas. Have you tried substituting another simple non-arrayed string as the source? Do you have a similar MID function working in another section of your program?

I think it has something to do with the length like u said. When i use the cps instruction to copy the length of the barcode to a dest. The source is a int and the dest is a dint. could that cause a problem?

what would be the best way to convert a int to a dint value?

bernie_carlton · Nov 7, 2014

I had a problem with a barcode reader in that, even though the strobe went TRUE the entire string was not in the result array yet. I waited until the length was something reasonable then copied. No problems after that.

hazemabdulrab · Nov 7, 2014

danatomega said:
That all looks good - I'm just about out of ideas. Have you tried substituting another simple non-arrayed string as the source? Do you have a similar MID function working in another section of your program?

It worked thank you. The problem was using the CPS instruction to copy the int length to a tag with a dint length. so i replaced it with a mov instruction instead of cps and it worked.

Thank you so much for the help. I really appreciate it.

MID instruction not working

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