Specifications

Understanding Device Positions
It is important to have a good understanding of the positions used by the
software. Here are several terms describing Device positions.
Centroid Position
A small purple colour cross or dot marks the centroid position. This is the
reference position of a Device. Every other position is relative to the centroid
position. The centroid position initially comes from the CAD data. The user
can change the Device’s centroid position by changing its Device Outline. By
definition, the centre of the Device Outline is the Device’s centroid position.
Before any Device update operation, it is important to make sure the centroid
is precisely at the centre of the Device.
Trained Position
Each alternate template has its position. The alternates do not need to be at
the centre if of the Device. Each solder area or lead area has its position.
Trained positions are derived during the definition of the Device and the
adding of its components.
The trained position of a template is only displayed when the Edit Alternative
dialog box is shown. Since the dialog box would appear in the middle of the
screen, it may biscuit the display of the trained positions. The user can move
the dialog box aside to view the trained position being displayed.
The Trained Position of a template is where the machine expects that
template to be found. The Trained position of a lead area is where the
machine expects the lead to be.
During a Device update the relative positions from the centroid to all the
various trained positions are being updated.
Found Position
Found Position of a template is where the machine actually found the
template. Found Position is only available after an inspection. It may have an
offset from the Trained Position.
When a Board Setup is first loaded, the boxes on the Device show the trained
positions. After the inspection the boxes shows found positions. This is why
the green boxes appear to “lock on” to the Device after an inspection. When a
Device fails the inspection its found position is not established. This is why the
red boxes do not usually “lock on” to the Device.