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Remove hidden connections

Message 1 of 5
239 Views, 4 Replies

Remove hidden connections

I'm new to PCB design and created my first one using Fusion 360. Dragged in several connectors, laid them out in the schematic document and afterwards started to draw connections using the nets function.

Now when I go to my board layout, I can see that there are a lot of connections that are there which I didn't draw. Also when I do an ERC, I get a lot of warnings showing that there are connections but not really a net wire, junction or other pin.


I can see those connections also in the "Parts" and "Items" view under the "On Net" column. The ones I created I gave a meaningful name (like GND, RAW, RXI, TXO, ...) but the other ones (N$X) are ones I didn't create and cannot see. Hence I also see no way in deleting them or setting that value to "--" like for the other pins. How do clean this up?Board_view.pngSchematic_view.png

Message 2 of 5

Hi @nickvanbaelen,


I hope you're doing well. If you look at your schematic carefully, you'll see that not every net is named. Specifically, the connections from PIR to BUSCPIR. Every net in a schematic has a name. If you don't specify it, then it gets assigned by default an N$x name where x is an integer. This is the normal behavior when working with schematics, generally you will only name important nets, it's often not desirable to name every single net(Imagine a design with 1000's  of nets).


If you zoom in on the pads on the PCB, you'll see the net names there so you can confirm what's connected where.


Let me know if you have any questions or concerns.


Best Regards,


Jorge Garcia
​Product Support Specialist for Fusion 360 and EAGLE

Kudos are much appreciated if the information I have shared is helpful to you and/or others.

Did this resolve your issue? Please accept it "As a Solution" so others may benefit from it.
Message 3 of 5

I see that.


Problem is that there are some connections in my PCB layout that are not visible in my schematic file. For example ARD_L pin 3, 4, 5, 6, 7, 8 connected with ARD_R 7, 8, 9, 10, 11, 12 respectively. I didn't connect these pins consciously in the schematic, so I don't want these connections to exist, yet they are there. The only nets I've consciously drawn in the schematic and that need to be there are RAW, GND, INP_2, TXO and RXI. You can also see them properly as blue lines in the schematic.


Clicking the undesired connections in the PCB layout editor and hitting delete doesn't work and provides the following error: "can't back annotate this operation please do this in the schematic"


So what I did was draw all the undesired nets in the schematic editor first and then delete them there. This way they are also gone on the actual PCB layout. But this still doesn't explain why the connections were there on my PCB layout, but not in my schematic editor in the first place... What I did worked, but there must be a better way.

Message 4 of 5
in reply to: nickvanbaelen
Message 5 of 5
in reply to: jesper8W75R

This is exactly my issue, only I have multiple airwires.

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