AOpen AOI-702U Especificações Página 118

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Operations | Reference Manual
FocalSpot, Inc. | www.FocalSpot.com
Page | 118
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When using a Local Library, the user can begin by starting a “New” Library or by importing and adding to an
“Existing” (inherited) Library.
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New Local Library (Pros) New libraries keep customer specific part numbers separate from common use to
eliminate the possibility of multiple part numbers being used for the same device. Separate libraries are also
smaller and therefore inspections run slightly faster than larger (mature inherited libraries).
New Local Library (Cons) Starting a new library of EVERY new board could result in a large number of files
and a great deal of duplication in the libraries themselves. More duplication will take up more hard drive or
network space [~10 Megabytes each]. However, by today’s standards, storage is cheap and therefore is not
generally an issue (but, volume over time will require cleanup).
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Inherit Local Library (Pros) Inheriting a customer library to use on a new product from the same customer,
still safeguards customer specific part numbers from contaminating other libraries, while minimizing the amount
of device image duplication. Inheriting a local library will dramatically speed up the training process for
revisions of a board previously trained. See Training a PCB from an Inherited Library.
Inherit Local Library (Cons) inheriting a customer library could result in the library becoming very large and
more of a risk to several of that customers products — if it was to become corrupted or contaminated by
mistake. Also, as an inherited library grows (matures) with the addition of several new products; the file size
grows and therefore inspections run slightly slower.
Best Practice: A good mix of logically created New (single product / single customer) files and Inherited
(multiple product / single customer) files provides a balance between the best of both worlds, while protecting
overall file integrity.
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AOI Mode software allows users to select either a Local or Central Device Library. There are advantages
and disadvantages of each type to consider before deciding to change from the default Local Library to a
Central Library. Just like Inheriting a Local Library all of the same PROs and Cons apply to using a Central
Device Library.
Central Library (Pros) the foremost reason for using a Central Device Library is the ability to update ALL
board setups simultaneously. With Local Library for a desirable change from one board setup to be added to
all files, this would be a manual, tedious and time consuming task.
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