I got bit by this several times - close the brd and
then make changes to the sch. Poof! Inconsistant and
no easy way to fix other than undo all your changes
exactly as they were.  I think this a real flaw in
eagle.  I recall running renumber.ulp without the brd
loaded - no way to undo those changes.  Fortunately, I
hadn't saved the sch so I just discarded it, opened
both the sch/brd and ran the ulp again. 

It should be a simple fix for cadsoft - catch a change
and give the user the option to load the brd. I'm not
even sure why they allow the sch to be open without
the associated board.  It's just inviting trouble.

Phil

--- Olin Lathrop <olin_piclist@embedinc.com> wrote:
> Roy J. Gromlich wrote:
> > Sometimes the Schematic and the PCB get out of
> synch - IC4 is one thing
> > in the Schematic and something else on the PCB.
> 
> This should never happen when Eagle is used
> properly.  You have to go out of
> your way to make this possible.
> 
> > In any case, the last PADs revision I worked with
> had a really neat
> > feature - it would generate a differences list
> between the Schematic
> > data base and the PCB layout data base.  It would
> analyze the data base
> > and display, in side-by-side form, all the
> differences between the
> > Schematic & the PCB.  You could then do an edit
> for each instance
> > (object/item) to make the PCB agree with the
> Schematic, or to make the
> > Schematic agree with the PCB. When you were done
> there would be only
> > one design data base with (hopefully) the proper
> entries for
> > everything, thus generating a BOM produced correct
> & consistent
> > results.
> >
> > Does anyone know of anything similar for Eagle?
> 
> DRC will tell you about differences between the
> board and the schematic.
> However by far the best approach is to make sure
> they never get out of sync
> in the first place.  Always make sure that the board
> and schematic are both
> open when making changes in either.  I don't think
> it's possible to get them
> out of sync if this is the case.
> 
> -- 
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