The
designation of layer types such as drill, signal or silk screen,
enables Valor NPI to perform analyses appropriate to the layer type.
The Job Matrix defines layer construction, layer types and subtypes,
polarity, drill intersection with board layers (for drilled via
holes), and sub-panel nesting.
For example,
when a silk screen check is run, NPI picks the correct layer, based
on the layer classification, reads the appropriate test limit file
and then performs the relevant tests.