Sure but doing this removes components unique identifier and the ability to do
DRC against the schematic. For particular types of boards basically large
numbers of repeating sections ( 'widebus' logic test boards) using connectors
mounted from the bottom side and a number of sites, its basically a mix of
Protel generated arrays (with ' _1'  type of renumbering from PCB) and
copy/pasted sections with user defined renumbering (added suffix)  Then this
gets tied back in with schematic designators and becomes basically a mess.

PCB builds and renumbers arrays by adding a suffix ie    _1, _2, _3

SCH builds and renumbers arrays by incrementing the final number ie R1 -> R2

Copy and pasting renumbered arrays in PCB gives you bizarre results like R1_1_1
which is hard to tie back to the schematic to maintain DRC ability.

It really doesnt seem like a hard thing to get right.

"Geoff Harland" <[EMAIL PROTECTED]> on 03/01/2002 11:11:30 AM

Please respond to "Protel EDA Forum" <[EMAIL PROTECTED]>

To:   "Protel EDA Forum" <[EMAIL PROTECTED]>
cc:    (bcc: Clive Broome/sdc)

Subject:  Re: [PEDA] Paired Mechanical layers (ex Inversion ...)

> Paired top and bottom silkscreens would be another idea worth
> specially when Protel does such a lousy job of handling designator and
> numbering. If you use the current system like designator = part  number =
> and use the designator mirrored and set to bottom silkscreen and part
number set
> to top. Once you start to use pasted arrays and step/repeated sections,
you get
> rubbish like connector names going from OA5  ->  OA5_1c. Looks like c**p
on a
> board.
> Clive Broome

If you want to paste components while retaining the *original* designators,
invoke the 'Edit/Paste Special...' command, and in the resulting 'Paste
Special' dialog box, check the 'Duplicate designator' checkbox. (You will
probably have to uncheck the 'Remove Duplicates' checkbox, within the
'Options' Tab of the 'Preferences' dialog box, before doing that though.)

(Having duplicated components like that is best done only in panellised
PCBs, and only after you are fully confident that the initial PCB fully
"passes muster". And when I panellise PCBs, I always retain separate files
for the original PCB and for the panellised form of that.)

If either additional paired layers or optional pairing of the existing
Mechanical layers were to be provided though, I could still imagine some
users wanting to use such layers as supplementary Silkscreen layers in some
circumstances (say for Acrobat file/paper documentation of components over
and above what was silkscreened onto the real PCBs themselves). And others
have already commented on the merits of having a pair of Assembly layers...

Geoff Harland.
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