Piexpval() – Rockwell Automation FactoryTalk Historian SE DataLink 4.2 User Guide User Manual
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FactoryTalk Historian DataLink Function Reference
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Argument
Value
outcode (integer)
An output code to determine results placement, either 0, 1, or 2.
PIServer (string)
The target FactoryTalk Historian server.
mode (string)
The mode used to determine which values are retrieved.
Returns
Outcode
Archive Value
Time stamp
0
output cell
1
left column
output cell
2
output cell
row above
Example:
The following retrieves the interpolated value for the tag cdep158 at
7:20pm on December 11, 1992 from the FactoryTalk Historian server
casaba:
=PIArcVal("cdep158","11-dec-92 19:20",0,
"casaba","interpolated")
PIExpVal()
Retrieves an archived FactoryTalk Historian point value based on an
expression, using the following syntax:
PIExpVal(expression, timestamp, PIServer)
Arguments
Argument
Value
expression (string)
A FactoryTalk Historian calculation expression.
time stamp (string)
The time stamp corresponding to the archive value.
PIServer (string)
The target FactoryTalk Historian server.