[PEDA] On the SCH but not on the PCB

2002-01-17 Thread Afshin Salehi

Hello all,
I was wondering how I would go about placing a part on the schematic but
not have it appear on the PCB.  For example, I would have 3 resistors in
parallel labeled 100, 200, 300 and I would only want one of those three to
appear on the PCB when I updated it. Is there a way to set if a part is to
appear on the PCB or is that not possible?

Afshin Salehi
DPS Telecom

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Re: [PEDA] On the SCH but not on the PCB

2002-01-17 Thread Jaurique, Brad

When using the update pcb command from the schematic choose to preview
changes
then remove the resistors you don't want from the change list.  But you
might have to
create a rule for the missing resistors.


Brad Jaurique
Pelco
Clovis, ca

-Original Message-
From: Afshin Salehi [mailto:[EMAIL PROTECTED]]
Sent: Thursday, January 17, 2002 10:36 AM
To: Protel Forum
Subject: [PEDA] On the SCH but not on the PCB


Hello all,
I was wondering how I would go about placing a part on the schematic
but
not have it appear on the PCB.  For example, I would have 3 resistors in
parallel labeled 100, 200, 300 and I would only want one of those three to
appear on the PCB when I updated it. Is there a way to set if a part is to
appear on the PCB or is that not possible?

Afshin Salehi
DPS Telecom

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Re: [PEDA] On the SCH but not on the PCB

2002-01-17 Thread Abd ul-Rahman Lomax

At 10:47 AM 1/17/2002 -0800, Jaurique, Brad wrote:
When using the update pcb command from the schematic choose to preview
changes
then remove the resistors you don't want from the change list.

This would work, but is unnecessarily cumbersome. One could accomplish the 
same thing by deleting the resistors after they were loaded. In another 
post, however, I suggested assigning a non-existent footprint with a name 
that made it clear that the error was intentional. This would be 
self-maintaining.

   But you
might have to
create a rule for the missing resistors.

No rule is necessary for missing parts. Net information is carried in two 
places in the Protel database, if I am correct. One place is a list of 
nets, which does not contain assigned pins; the other is the net field in 
the primitive records.

Unlike Tango, Protel does not create dummy pads for unplaced components. If 
a component is not loaded because the footprint does not exist, the pad 
simply does not exist.

This is an important point: DRC will *not* inform you about missing 
components, that is, components on the schematic that are not on the PCB, 
either because load failed or was interrupted, or because the component was 
later deleted. If it is deleted, it's gone, except, of course, for the undo 
buffer.

So it is highly advised to *always* update PCB from schematic before 
releasing a board, to verify that no macros are created, or that any macros 
which are created are intentional deviations between schematic and PCB.

[EMAIL PROTECTED]
Abdulrahman Lomax
Easthampton, Massachusetts USA

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Re: [PEDA] On the SCH but not on the PCB

2002-01-17 Thread Abd ul-Rahman Lomax

At 10:35 AM 1/17/2002 -0800, Afshin Salehi wrote:
Hello all,
 I was wondering how I would go about placing a part on the 
 schematic but
not have it appear on the PCB.  For example, I would have 3 resistors in
parallel labeled 100, 200, 300 and I would only want one of those three to
appear on the PCB when I updated it. Is there a way to set if a part is to
appear on the PCB or is that not possible?

If the footprint assigned to the part is one which does not exist in any 
library, such as DO_NOT_USE, then no part will be created in the PCB, and 
any nodes for that footprint will be ignored. You will get a macro error 
telling you that footprint DO_NOT_USE was not found, which you will 
immediately recognize as intentional

You can thus control which of the three resistors is used by controlling 
footprint assignment. I would display the footprint fields, I think you can 
do that, on the schematic.

[EMAIL PROTECTED]
Abdulrahman Lomax
Easthampton, Massachusetts USA

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