Independent punching on a hole detect controller is not relative to anything else like it might need to be on a non-hole detect. On a hole detect the repeating pattern places holes that the controller then detects, possibly counts, and then cuts.

A customer with a dual line encoder system complained that the controller would not start punching the independent holes until the leading edge of the material reached the shear. On coil thread up, they wanted to start punching holes right away to avoid unpunched material that would be unusable for parts.

The hole detect code was modified to start punching independent punches immediately as soon as the pattern is detected to have an independent operation.