LINEAR UNIT KL 4000

Hi! Just got my first linear unit assembled. What seems strage to me is that the unit works using negative values. I mean with this configuration each E1 point will be rapresented by negative values... why is that? Is there a way to change it?

I played around with the interface within WorkVisual and I saw that it's possible to change the configuration. Tomorrow, I will try loading it to see if it works correctly.