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Isolated mounting holes and "Unrouted Net Constraint" DRC errors

r.gibson

I have some electrically isolated mounting holes and am getting an "Unrouted Net Constraint" DRC error. Is there any way to selectively disable this DRC constraint? I looked in the DRC configuration (see attached image) and don't see any way to turn it off based on Net or Net Class...which is what I need.

 

Currently I have assigned a unique, user defined net name to each mounting hole, then assigned a common Net Class to all of them in order to establish a clearance constraint to them from all other primitives...but now I can't seem to clear this error, even though there is nothing legitimately wrong with the layout...they are SUPPOSED to be unrouted.

 

image

  • 0

    I just attempted to create a new rule in the UnRoutedNet design rule and make it so that it doesn't need to be connected.  And I failed.  I don't know how you would go about designing what you are asking.  So let me give you my solution that I came up with a while ago.  I created schematic symbols for two different types of mounting holes.  The first has a pin attached so that I can connect it to a net.  The second has no pin attached.  I also needed to create two footprints.  One has the vias connected to the net and the other has vias with no net.  So far this has worked for me since I've never been able to come up with a polygon pour system that avoids the mounting holes and doesn't require them to be connected together. 

    image

    I hope this helps.

  • 0

    James, thanks for the feedback.

     

    ...so I just dug in a little more and realized that I also forgot to check the "plated" checkbox on the mounting hole footprint. The DRC check had warned me that it wasn't plated, so I went in and plated the footprint and updated the PCB and the DRC violation for Unrouted Nets went away as well...so I guess problem solved...? Not really sure why an un-plated hole would cause an Un-routed Net violation for a hole without any other connected components...but that seems to be what my problem was...