Hello,
Is there a tag setting to interpret negative variable values as 0 ?

Yes, you can define min and max values in the tag scaling.

Hi Dave,
The tag is scalled with 0 min value.

Still i get the negative value.

Sorry, the display range is for certain widgets but does not affect the tags read value. The scaled range only affects a tags write value range and not the read value range.
If your scaled number is correct but you want to limit it, you can create a calculation tag which references the tag and limits the value.

The calculation tag expression would simply be:

//Example using tag absolute path 
Limit([<path/to/reference/tag>],0,100)
//Example using relative path to parent tag
Limit([..],0,100)

The output would be similar to that below:

If you need to do this a bunch of times, consider creating a tag type for this. It's more effort up front but may provide some great experience and will be more efficient in the long run.

Thank you, Dave !