On KiCAD 7, there is netclass as fields inside label.
This shown at net label dialog.
What the function for these? Why people need many net class inside 1 label. Why not 1 to 1?
I think just the reverse, 1 netclass may have many labels inside.
I remember for kicad 5 below, net class is used for defining default track width at PCB. Also the net labels is same on every location with same netclass.
Maybe I can have illustrated explanation?
I’m still getting to grips with KiCad V7, and it was not clear what you meant, so I ad a look at label properties and managed to add a netclass to a label:
To me it also does not make sense to add multiple net classes to a single label, but the intention is probably to have a “future proof” dialog in which other fields can also be associated with a label.
Assignment of net classes has also changed significantly in KiCad V7. In KiCad V6 and older, you just had a list with nets, and you had a separate system for assigning nets to netclasses. In KiCad V7 there is Schematic Editor / File / Schematic Setup / Project Net classes, and you can create filters to add nets to a netclass. KiCad now also has: Schematic Editor / Place / Net Class Directive (also in the right side toolbar).
It’s quite new, and I’m not sure whether I like it, but it also works. I also expect that these functions will receive further refinements in the future.
That screenshot is exactly what I meant.
In the label dialog you can either select a netclass from a dropdown list, or you can enter a new one.
Be aware, however, that entering a new netclass there does not create it. You still have to create it in the Schematic setup.
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