Rockwell Automation 5370-CMPK Color CVIM Module MATH-PAK - Manual (Page 61)

Chapter 4
Defining Formulas
4–46
•
The REFERENCE (ideal or nominal) value is 1.
•
WARNING RANGE – Low 0. High 2.
•
FAULT RANGE – Low 0. High 2.
With the range limits set as shown above, the only acceptable formula result
is 1. If the formula result is not 1, the formula fails. Note that in this case
WARNING RANGE limits are the same as the FAULT RANGE limits.
Figure 4.24 Example: Formula with conditional operation for comparing gage results
GAGE1 > GAGE2
Assigning Range Limits to Results Output Lines
As with range limits for gages and windows, you can assign outputs to the
range limits you set for formulas. To assign a
formula range limit to a
Result output line:
•
Pick the Output box under the FAULT RANGE or WARNING RANGE
heading, as appropriate. The USAGE menu appears (see Figure 4.25,
4–47).
•
Pick the appropriate
Results box in the
USAGE menu.
You can select outputs lines only if have been previously assigned to results.
For example, as shown in Figure 4.25, only output lines #1 and #2 are
enabled and available; they are the only lines with a
Results assignment, in
this case. The other output lines are either assigned other functions or are not
used; thus, they are not available for range limit use. For information on
assigning functions to output lines, see Chapter 11, Discrete I/O Line
Configuration in the Color CVIM User’s Manual.
Remember, you can assign more than one range limit to a single Results
output line. For example, you might assign both the High and Low
WARNING RANGE limits to one Results output line, and assign both the
High and Low FAULT RANGE limits to a different Results output line.
Or, for example, you might assign the FAULT RANGE limits for several
different formulas to a single Results output, if this meets your application
requirements. In this case, the Results output would be activated if any one
of the assigned FAULT RANGE limits for any of the formulas were
exceeded.