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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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