Rockwell Automation 5370-CMPK Color CVIM Module MATH-PAK - Manual (Page 57)

Chapter 4
Defining Formulas
4–42
The two sets of range limits have this relationship:
LF <= LW <= REFERENCE <= UW <= UF, where:
LF = Low FAULT RANGE limit
LW = Low WARNING RANGE limit
UW = High WARNING RANGE limit
UF = High FAULT RANGE limit
The REFERENCE value could be based, for example, on the “mean”
formula result from a trial series of inspections conducted with the Color
CVIM module running in learn mode.
Once you have set the High and Low WARNING RANGE and/or FAULT
RANGE limits for a formula, you can assign the limits to output lines, which
would then be activated whenever the respective range limits were exceeded.
Formula status: If a formula inspection result lies within both the FAULT
RANGE and WARNING RANGE limits, a “pass” condition exists for that
formula. If the result lies outside a WARNING RANGE limit, but within
the FAULT RANGE limits, a WARNING condition exists for the formula.
In addition, if the formula result also lies outside the FAULT RANGE limits,
a FAULT condition also exists for that formula.
Formula result format/conversion: The result for a particular formula is
expressed in either fixed decimal point, or integer value, as appropriate for
the operands and operators in use. When you set the range limits, either the
integer format or fixed decimal point format is used by the Color CVIM
automatically, as appropriate for the type of result.
If the formula is changed after the range limits are set, so that the required
result format changes, the format of the range limit is converted
automatically. If a fixed point range limit is converted to integer format, the
range limit value is rounded to the nearest integer value.
Result Restrictions: Integer results for a formula are restricted to the range
of
"2,147,483,647. Fixed point (decimal) results for a formula are
restricted to the range of
"32767.000. If a formula result goes beyond the
allowable range, a result of 0 is returned, and the formula fails.
Master range status: The FAULT status for each formula has an effect on
an output called the Master Range . For each inspection, if any user-defined
FAULT RANGE limit is exceeded, the Master Range status is activated; if
Master Range is assigned to one of the output lines, the output line is
activated accordingly (see Chapter 11 in the Color CVIM User’s Manual for
information on the
Master Range and output line assignment).
Multiple range limit assignment to a single output: You can assign more
than one range limit to a single
Results output line. For example, you can
assign both the High and Low WARNING RANGE limits to one Results