Phil,

What we do is to append a suffix to the rev and mark the boards, e.g. Rev C becomes C3 (third rev of the C artwork). Same goes for the BOM and engineering master (in our MRP program). 

Firmware is another story.  You know software, its never etched in stone. Any code that might need to be changed in the future must have a way for the customer to download the update. 

Bob Landman
H&L Instruments

Sent from my iPhone

On May 3, 2013, at 1:34 PM, "Nutting, Phil" <[log in to unmask]> wrote:

> Hi All,
> 
> Although this is not directly related to circuit board technology it does apply to the management of inventory affected by Engineering Change Orders.
> 
> I'm interested in knowing how your operation manages on-hand inventory after an ECO has been approved and is in the implementation phase.
> 
> Assume you have 25 bare boards at Rev B, the ECO is bumping the revision to Rev C, MRP is driving a work order for 100 pieces and the difference between B and C can be done as a rework to the Rev B boards and then "used as" Rev C boards in the kit of 100.
> 
> What drives the rework, instructions in the ECO, Material Control personnel, ECO coordinators?  Or is it simpler to manage by scrapping out all out of rev inventory?
> 
> I know how it was done in a previous life (mid '70s) so I know it can be done, just not with our current system/people here.
> 
> Thanks in advance.
> 
> If you have documentation to share please send it offline.
> 
> Phil Nutting  |  HVP Development Engineer   |  Excelitas Technologies Corp.
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