At 07:59 PM 7/7/2005, Brad Kosiance wrote:
Macro 1: New Node
Add node CR3-2 to net NetR8_1
Error: Node not found
Take a look at the actual footprint for the part. Quite likely you will
discover that CR3 has no pin 2. Instead, perhaps, it has A or Anode (or C
or K or Cathode). Likewise:
Macro 2: New Node
Add node Q2-2,4 to net IOBUS+
Error: Node not found
As I recall, some of the standard Protel parts showed this problem.
Transistor pins can be named functionally in the schematic with names like
E, B, C, or pin numbers can be used. Pin numbers, of course, are related to
specific packaging, whereas names are functional and would correspond to
different pin numbers.
Basically, either change the schematic symbols or edit the PCB pads to have
the appropriate pin names. Which one you should do depends on which one you
find clearer. I do generally recommend that the PCB footprints be given
numbers that correspond to actual pin layout. This can be a real mess with
some parts, though, some three or four-pin discretes are numbered different
ways by different manufacturers. And if the PCB footprints have numbers,
the schematic symbols should also have numbers; the symbols should
correspond to specific implementations of the part.
Using generic symbols won't work very well when you want to translate it to
PCB; if you use a generic transistor with pins named E,B,C, you have to
have different PCB footprints for each variation. Better to have, for
example, a single TO-92 footprint that works with all TO-92 parts, and use
a specific symbol on the schematic that associates the proper pin numbers
with the functions of the pins.
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