You can use tag elements (such as "Tag1",
"Tag1.Field") and tag element items (such as "Tag1.Field.Q") in
Cicode expressions. However, by default, when a tag element or an
element item is not accessible, or the element quality is not
"Good", graphic objects will indicate that state by displaying some
error messages or dithering.
UNINTENDED EQUIPMENT OPERATION
If you change the value of this parameter to
1, no dithering or background color will visually identify that an
element is not Good or is not accessible, even if the parameters to
display such an identifier have been set elsewhere. In such a case
the operator may operate the plant inappropriately by relying on
incorrect data.
Use the QualityIsOverride() Cicode function or
similar method to identify if a tag element has been
overridden.
Failure to follow these instructions can
result in death, serious injury, or equipment damage.
However, you have the option to disable the
default behaviour and to display values even when the element
quality is not "Good". This option is controlled by the
IgnoreValueQuality Cicode task context attribute, which provides
equivalent functionality to [Page] ComBreak, which is now obsolete
.
Allowable Values:
0 - The Control Client supports the existing
behaviour (#COM) except dithering (dots) will be not shown on text
objects when an error is indicated by #<Error Message> (refer
to table of errors below).
1 - The quality of tag subscriptions will be
completely ignored. This is equivalent to having previously used
the (now obsolete) [Page] ComBreak = 0. The numeric or text objects
will display a "bad" quality value and animation will continue. No
dithering will be shown.
2 - The text or numeric objects will display "bad"
quality values. The background color of the text / numeric objects
will change to indicate the quality status. The background colors
for QUAL_BAD and QUAL_UNCR are defined by [Page]BadTextBackgroundColor
and [Page]UncertainTextBackgroundColor
citect.ini parameters.
If [Page]IgnoreValueQuality=0 the following
short error messages may be displayed on graphical pages when the
Quality of a tag is 'NOT GOOD'. Refer to the Cicode Programming
Reference -> Cicode and General Errors section for more
information.
You can override the IgnoreValueQuality setting
for a particular page by using the Ignore Quality field on
the Page Properties dialog in Graphics Builder.
Note: The quality of tags referenced by
items, ex. Tag1.v or Tag1.Field.t, is GOOD and its timestamps are 0
(INVALID TIMESTAMP). Therefore they give no visual indication of
quality, error or change in handling state such as control inhibit
or override mode regardless of the setting used for the [Page]
IgnoreValueQuality parameter.
