Rockwell Automation FactoryTalk Historian SE DataLink 4.2 User Guide - Manual (Page 46)

●
●
●
●
●
FactoryTalk Historian DataLink User Guide
38
Show Value
Attributes Select show value attributes to display extended status bits associated
with returned event values. The returned bits correspond to value
attributes stored in FactoryTalk Historian, and may be one of the
following:
 A = annotated, indicating a comment has been added to the
event.
 S = substituted, indicating the event value has been changed from
its original value.
 Q = questionable, indicating that there is some reason to doubt
the accuracy of the value.
Value attributes are displayed in a column to the right of event
values.
Show Annotations Select show annotations to display any annotations associated with
returned event values in a column to the right.
Annotations are notes or comments appended to a data value in
FactoryTalk Historian for descriptive purposes.
Special Notes Reference a range of tag names to display compressed values for
each. Note that by default, values are displayed in rows for a column
of referenced tags, and in columns for a row of referenced tags.
If the Start or End Time is the current time (*), then the first (or last)
value is actually the current snapshot value, and not an archive value.
Once the snapshot value passes through the FactoryTalk Historian
Server's compression algorithm, it may not actually be recorded in PI.
The PICompFilDat() function is used for End Time functions if a filter
expression are specified; otherwise, the PICompDat() function is
used.
The PINCompFilDat() function is used for Number of Values functions
if a filter expression is specified; otherwise, the PINCompDat()
function is used.
Example:
To see the most recent 10 values of the sinusoid tag, the following
arguments are set for the Compressed Data function:
Number of Values
Tagname = sinusoid
Start Time = <cell reference to current time>
Number of Values = 10
backwards in time
Boundary Type = inside