Rockwell Automation 5370-CVIM2 Module - Manual (Page 261)

5 Chapter Chapter 7
Inspection Tools
7–23
Direction
The search direction is the direction used to search for an edge along the
length of the gage. The two available choices are these:
Head to Tail and
Tail to Head .
When you pick the Dir menu field (in the Define Feature menu)
successively, it toggles to the opposite direction. Thus, Head to Tail changes
to Tail to Head , and vice versa.
Head to Tail causes the edge search to begin at the “head” of the gage; Tail
to Head causes the edge search to begin at the “tail.” Note that in the Pick &
Place panel, the position of the head of the gage is defined by the X1 and Y1
coordinates, while the position of the tail is defined by the X2 and Y2
coordinates.
The choice of search direction should be based upon which one leads most
directly to the specified edge. Normally, the best search direction is the one
in which a false edge is least likely to be encountered.
Offset
The current offset location is identified on the screen by a “+” symbol. You
can change the offset location by picking the
Offset field successively.
When you pick the Offset menu field successively, the offset marker (+)
moves along the line gage in the selected search direction. The displayed
offset will be one of these:
•
Fixed –– This refers to the head of the gage for the head–to–tail search
direction, or the tail for the tail–to–head search direction.
•
Center –– This refers to the midpoint between the first edge and the last
edge.
•
1.0, 2.0, etc. –– This refers to an edge specified by number.
•
1.5. 2.5, etc. –– This refers to a midpoint between two adjacent edges.