And just to add one more (which was the instance that prompted my
question):
Logos, certifications, etc.: symbol: no, footprint: yes, virtual: yes.
But I see now that we can’t use virtual as a proxy for “don’t
treat as ‘extra’ when deleting extra footprints” because if you
delete a symbol in one of the symbol:yes cases, then you _do_ want the
footprint deleted.
Cheers,
Jeff.
On 22 Jul 2019, at 01:53, Dino Ghilardi <dino.ghilardi@xxxxxxxx>
wrote:
Just few examples (expanding jp's answer):
having a schematic symbol, being virtual, having 3d model are not
related (you can have any combination of them). As examples:
First: a virtual footprint that has a schematic symbol (the answer
to your main question).
Edge connector: schematic symbol: yes, footprint: yes, virtual: yes
(the connector is implemented only with tracks on pcb, without the
need of additional components so no need to have it in the BOM).
"regular" component, as a Resistor 0805: has schematic symbol, Has a
footprint and we want it in BOM. (virtual: no.)
Hole without screw (yes, I'm copying jp's example): No schemaitc
symbol (or sometimes yes, depending on user's habits: someone likes
to have on schematics anything that will be on PCB, including
holes): Has a footprint but no items in BOM: (virtual: yes)
Hole with screw: Has a footprint but you want a corresponging item
in BOM to have the list of screws you need to buy (virtual: no).
P.S. (little bit off-topic):
Sometimes also virtual components can have 3d shapes (it is not
common but it is a way to quick-workaround a 3d view of a
more-than-one board assembly: export a step file of the board 1 and
assign that as a 3D shape to a connector or a mounting hole of board
2. -very useful to check for mechanical collisions-).
Cheers,
Dino.
---------------------------------------------------------------------
On 22/07/19 09:02, jp charras wrote:
Le 22/07/2019 à 06:03, Jeff Young a écrit :
This flag tells us that there’s no physical object for a
pick-n-place machine. But is it also true that there’s no
corresponding symbol in the schematic, or are there some virtual
footprints that would have a symbol?
What about some microwave elements, for instance? Do they have
symbols?
"Virtual" footprint means the physical "component" is made only by
the
drawings on the board.
Therefore:
- These fp have (usually) no 3D shapes, and the component should be
not
in BOM.
- They of course have a symbol in schematic.
In fact any footprint connected to a at least one net *should* have
its
corresponding symbol in schematic.
(I am thinking all footprints should have a corresponding symbol
because
in many cases these fp need a unique refdes: for instance to import
them
to a .dsn file)
Microwave elements, and edge connector cards are often virtual, if
only
a drawing is enough to create them.
Net ties are virtual and *need* a symbol.
However, Microwave elements and Net ties connecting 2 or more
different
nets are not easy to use in Pcbnew:
See this thread
https://lists.launchpad.net/kicad-developers/msg24455.html
to know what is missing in Pcbnew (the Tomasz's proposal is exactly
what
is needed in Eeschema/Pcbnew).
Mechanical holes can be virtual or not:
A mechanical hole with a screw inserted inside it should be not
virtual.
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