My comments..
We normally assign L to R, BUT, B to T. Why, you
ask??? Uniformity!! Since most design want all
components need the connectors, components are placed
as close to the I/O as posible. Therefore near the
top, we would add empty pads for the alway popular
bye-the-way/additions/deletions/enhancement/etc.
Now, everyone in the food chain knows where U1, R1
etc are starting. If additional parts are added after
a design has been released, then we will just assign
next ref des reguardless of position. Why, because
there are tons of documentation (test procedures,
fixtures, manuals, etc.) out on the street and you
don't want to replace all because you added a pull
down resistor near the bottom of the board. Why not!
Just the way we do business. Have a great day.
Regards,
Bob Vanech
BVAN Enterprise
> Left to right, Top to bottom on the PCB board.
>
> It is critical for inspectors on production lines,
> it makes "learning" the board much easier and reduces
> inspection & placement errors.
>
> > -----Original Message-----
> > From: Hope Lariosa [mailto:[log in to unmask]]
> > Sent: 20 October 1999 17:45
> > To: [log in to unmask]
> > Subject: Re: [DC] component numbering
> >
> >
> > on the schematic or board?
> >
> > At 12:25 PM 10/20/1999 -0400, Dallara, Louis T (Louis) wrote:
> > > Left to right and then top to bottom..
> > > Lou
> > >
> > >> ----------
> > >> From: Hope Lariosa[SMTP:[log in to unmask]]
> > >> Reply To: DesignerCouncil E-Mail Forum.;Hope Lariosa
> > >> Sent: Wednesday, October 20, 1999 12:09 PM
> > >> To: [log in to unmask]
> > >> Subject: [DC] component numbering
> > >>
> > >> Is there a 'standard' on how to number components?
> > >>
> > >> I'm referring to the way reference designators for
> > components are placed.
> > >> If people (engineer, designer, assembler, technician) want
> > to see a Right,
> > >> Down method, would that apply to the schematic or the
> > board? If there is
> > >> no stanrdard, I'm sure it all boils down to whatever the
> > people involved
> > >> agree upon.
> > >>
> > >> I was wondering what the popular concensus is...anyone?
> > >>
> >
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