Rockwell Automation 5370-CMPK Color CVIM Module MATH-PAK - Manual (Page 60)

Chapter 4
Defining Formulas
4–45
Using the learn mode statistics: You can run a series of trial inspections,
using a representative sample of workpieces, with the Color CVIM module
in Learn mode, in order to accumulate a statistical basis for setting the
FAULT RANGE and WARNING RANGE limits. For more information on
the learn mode, refer to the Chapter 20 in the Color CVIM User’s Manual.
Example Range Limit Setting
Here is an example of setting the range limit values for a formula:
AVG(GAGE1, GAGE2, GAGE3)
which averages the values of three gages (see Figure 4.23), in relation to the
REFERENCE value:
•
The REFERENCE (ideal or nominal) value is 15.000.
•
WARNING RANGE – Low 14.800. High 15.200.
•
FAULT RANGE – Low 14.600. High 15.400.
With the range limits set as shown above, if a formula result is outside either
WARNING RANGE limit (above 15.200 or below 14.800), but within the
FAULT RANGE limits, the formula will have a WARNING condition only.
If an inspection result is outside either FAULT RANGE limit (above 15.400
or below 14.6), the formula will have both a WARNING and a FAULT
condition.
Figure 4.23 Example: Range limits for linear gaging
A B
15 cm (Ideal)
Gages measure distance
from feature A to feature B
A B
A B
Gage 1
Gage 2
Gage 3
Here is an example of setting the range limit values for a conditional
operation by a formula (see Figure 4.24, page 4–46), where the
REFERENCE value, 1, is the only acceptable value: