[PCB_FORUM] symbols form libraries and BRD database
- From: William Billereau <William.Billereau@xxxxxxx>
- To: <icu-pcb-forum@xxxxxxxxxxxxx>
- Date: Wed, 15 Sep 2010 11:03:07 +0200
Hello All.
We have a problem that seems to be appeared in the 16.3 (to be
confirmed).
If you start a BRD from another containing some symbols definition,
before this release 16.3, if you added a new component using this symbol
definition Allegro took the definition embedded in the BRD.
If the symbol has been modified on the disk, you had to make a "refresh
symbol" to get the new symbol definition in the BRD file, even for
recent placed components.
Now, if you place a component, it seems that Allegro reads the
definition of the symbol on the disk without using the embedded one.
This means that you got in the BRD old symbol definition for components
already placed in the BRD and new symbol definition for newly placed
component.
Then, it is not really a problem within Allegro.
We modified a lot of component applying IPC and LPWizard rules.
One of this rule is the symbol origin.
For a 0805 resistor, in the past, our symbol had the origin on pin one.
Now the origin is the body center of the resistor.
If you apply a refresh symbol, you have to move all previously placed
resistors, nothing critical, just a little bit annoying.
But the main problem is for assembly.
ODB++ output or Fabmaster output contains 2 different kind of 0805 that
are finally the same!
It results in a displacement from the copper for some of them depending
on which definition is taken first:
If the first definition is the body center, then all resistors defined
with origin on pin on have an offset of the half on the right or left,
according to their rotation.
And vice-versa.
Is there a way (User Preferences?) to force Allegro to keep the embedded
symbol definition for all new placed components?
If not, we will have to implement an automatic refresh for all new
BRD....
Thanks in advance.
William.
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