00198763-02_VD_SIPLACE_Pro_17.1_R20-1_EN_DE.pdf - 第20页
SIPLACE Pro 17.1 (R 20-1) / Versi on Description 05/2020 Edition 20 4.4 Handling of Critical Pai r s in High Density Place ment When placing compo nents with minimal ga ps in between (High D ensity Placemen t), specific …
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In SIPLACE Pro Desk the vacuum tooling configurations under Tools – Vacuum Tooling have
been extended by barcode related parameters. You must specify the following parameters for
vacuum tooling:
● The dimension of the vacuum tooling (length and width)
● The X-/Y-offset of the barcode fiducial in relation to the reference point
● The reference to the barcode fiducial
● The barcode verification string
When a barcode fiducial is scanned by the PCB camera, the barcode verification string is used to
identify the vacuum tooling on the station. In SIPLACE Pro, the drawing for the vacuum tooling
indicates the dimensions (length, width), the reference point of the vacuum tooling and the location
of the barcode fiducial on the vacuum tooling surface.
Figure 4-1: Example of a vacuum tooling drawing in SIPLACE Pro Desk
Using barcode fiducials to verify vacuum tooling is optional. If you want to activate or deactivate the
use of barcode fiducials as a verification method, activate or deactivate the Barcode Verification
checkbox that has been added to the Vacuum Tooling configuration in the SIPLACE Pro station
setup. By default the checkbox is deactivated.
Figure 4-2: Checkbox for activating the barcode verification method
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4.4 Handling of Critical Pairs in High Density Placement
When placing components with minimal gaps in between (High Density Placement), specific
placement problems may arise. For example, it might be possible that there are minor height
variations in component heights that could be caused due to their manufacturing process or differ
between batches. These minor component height variations can cause nozzle collision as shown in
the figure below:
Figure 4-3: Example for a nozzle collision caused by height variations
It might also occur that components shift on the nozzle during placement, causing placement error
due to the minimal space between the components as shown in the figure below:
Figure 4-4: Example for placement errors
Adjacent components that might cause such problems are referenced to as “critical pairs”.
To better support high density placement and the handling of such critical pairs, the Precedence
Finder module in the SIPLACE Pro Optimizer has been extended by a “Critical Pair Finder”
functionality. This Critical Pair Finder checks if components are considered critical pairs based on
tolerance values that have been defined for the gap distance between components and their
component height. The tolerance values can be specified in the Critical Placement Pairs tab that
has been newly added to the Settings menu.
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Figure 4-5: Setting tolerances for critical pairs
Additionally, in the Precedences tab of the Board Editor, you can specify as of which height
difference between components the station should heed the placement sequence specified by
SIPLACE Pro Optimizer. This value can be specified and saved individually for each board side.
Figure 4-6: Setting height value for when to check preferences
NOTICE
The placement sequence for critical pairs is decided at the station, and therefore is not
simulated during optimization.