Michael,
Another way to accomplish this for clarity reasons (I do not
know how well this will go over) is to place the pad with the
appropriate hole size, ie: 6-32 screw, in the footprint and then
describe it in the designator. I have mounting holes on my prototype
boards that I use marked 6-32 MHOLE in the designator field. This seems
to work reasonably well. I've also marked mechanical holes in footprints
using 0 as the designator in all of the pads that aren't connected. I
can't recall ever seeing a pin 0 on a component. Just a thought.
Dan Enslen
The only reason time exists is so
everything doesn't happen all at once.
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
On Behalf Of Robison, Michael R NAVSEA
Sent: Friday, October 21, 2005 4:48 AM
To: Protel EDA Discussion List
Subject: RE: [PEDA] Footprint holes that aren't electrical
Thank you, Mr. Lomax and Mr. Saputelli.
I had the mistaken impression that the way I was using pads for
mounting holes for DSUB connectors, that it needed to have a
corresponding electrical connection in the component. I was
thinking that I needed to do something special (and I didn't know
what that was) to make a non-electrical hole in a footprint.
Thanks again, Michael
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Abd ul-Rahman Lomax
Sent: Thursday, October 20, 2005 8:00
To: Protel EDA Discussion List
Subject: Re: [PEDA] Footprint holes that aren't electrical
At 07:50 AM 10/20/2005, Robison, Michael R NAVSEA wrote:
>How can I create holes through a board in a footprint that don't
>have to have an electrical parallel in the schematic component?
>I've been using pads in the footprints to create mounting holes
>and then I have to put dummy pins in the schematic component.
No, there is no particular reason to put those dummy pins in the
schematic symbol, unless you want the pins electrically connected. If
not in the schematic, the pads will have no net assigned (and DRC
will report an error if they are connected), the same as if they
*are* in the schematic with no net connected.
On the other hand, if you want them connected, they should be in the
schematic. Otherwise, even if you manually assign them the
appropriate net, it will be removed whenever you update the board.
Abd ul-Rahman Lomax
LOMAX DESIGN ASSOCIATES
PCB design, consulting, and training
Protel EDA license resales
Easthampton, Massachusetts, USA
(413) 527-3881, efax (419) 730-4777
[EMAIL PROTECTED]
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