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Re-annotating hierarchical sheets

awardautomation

Ok so if you use Hierarchical Sheets to add multiple instances of the same schematic block, you will obviously get duplicate designators on your pcb layout.

CS solves this by adding a suffix to the component designators, consisting of an underscore and the designator you used for the sheet symbol.

The only problem is the designator names get a bit long, and take up real estate on your board.

I was trying to reduce designators lengths by re-annotating the PCB, then using -> Update the Schematic from PCB.

ECO window correctly matches the names and reports that it has worked but in fact it only changes the main sheet.

If you look in the tabs along the bottom of the sub sheet you will see the designators are unchanged.

Has anyone found a workaround for this?

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  • 0 in reply to e14softwareuk

    This is great! Thanks Peter

    The best way I found to use this was to start numbering in the sub-sheet from R1, D1 etc, and to use A,B,C as designators of my sheets.

    This way the composite name ends up as R1A, D1B etc...  i.e.  only 3 characters long.

    Then I start the main sheet at R10, D10 etc, since they don't have a suffix, they will also be only 3 characters.

    Suffice to say my sub-sheet is a small circuit with less than 10 of each category of component.

  • 0 in reply to e14softwareuk

    Hi Peter,
    How would one go about getting the behavior shown in the example project (PCB_PCIe_4-Port...) where the separate channel's components get annotated with a simple number?  The example project doesn't seem to follow it's own settings (Multi-Channel project options: $Component_$ChannelName). 

     

    EDIT:

    Maybe a clue...I see where the annotation has been set manually (pic below).  Any ideas?

    image

  • 0 in reply to bugrobotics

    Not sure you can reproduce the example board behaviour without manually assignment. It is possible to mess with the assignments to get just numeric designators like below. This might not be a great example given there seems great potential for name clashes.

    image