I have recently edited a schematic circuit whereby I created a new component based on an existing one.
I then hen swapped an existing device from a schematic with a new component I has just created. I then forwarded design changs and got to the point where the new component was connected to other components via the nets.
Upon running the Design rule check, the SPN symbol appears above all pins on the new device that aren't connected to the power or ground rails.
SPN means there is a named net that is not connected. If they should be connected just remake the connections in the schematic and forward your design changes. When replacing a like for like component in a schematic, what you should do is select the part and then right click and "disconnect from nets" this leaves the nets intact. Then align the new component on the old connections, they will turn red if they attach ok.
Of course if you had done an edit to an existing component in a library, then you could have simply used to update component function.
Keep an eye on power connections especially. Easy Pc treats all as components that inludes power rails. Duplicating can prove to be frustrating. Duplicating a power rail does not make a connected power component. It now asks but it's easy to make a mistake. Make sure all connections are connected in schematic .
Problem comes when you try to duplicate these "T" shaped thingies. Sometimes the net goes with the symbol, other times it fails and you THINK the net is connected to the rail.
Either do as Iain says, don't use them, or use COLOURed nets such that they stand out! So if the wire stays black when you add one of these components,- it's disconnected!
Sometimes you see the component name (Vcc_5V) and NOT the net name which is something completely different.
SPN: Single pin Net
Posted - 11 Apr 2014 : 09:49:21
