Rockwell-automation FactoryTalk Historian SE DataLink 4.2 User Guide Manual de usuario descargar pdf (Pagina 145)

9 ● FactoryTalk Historian DataLink Function Reference

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Argument

Explanation

PIServer (string)

The target FactoryTalk Historian server.

Returns

See specific information for PICalcDat() outcodes (page 132).

Example:

The following retrieves totals for the expression 'cdf144'+'cdt158',

from midnight yesterday to midnight today at 3-hour intervals from the

default FactoryTalk Historian server:

=PIAdvCalcExpDat("'cdf144'+'cdt158'","y","t","3h","total","ti

me-weighted","compressed", "10m",50,1,4,)

The result is multiplied by 1. Since compressed is the specified sampling

mode, the sampling frequency is ignored and the expression will be

sampled at the combined compressed events of cdf144 and cdt158.

The minpctgood is 50 percent so result will only be displayed if

percent good is 50 percent or greater. The percent good is returned next to

the total.

PIAdvCalcExpFilDat()

Retrieves filtered, calculated FactoryTalk Historian point values based on

an expression, using the following syntax:

PIAdvCalcExpFilDat(expression, stime, etime, interval,

filtexp, mode, calcbasis, sampmode, sampfreq, minpctgood,

cfactor, outcode, PIServer)

Arguments

Argument

Explanation

expression (string)

A FactoryTalk Historian calculation expression.

stime (string)

The start time for the range of calculation (in FactoryTalk Historian

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Rockwell-automation FactoryTalk Historian SE DataLink 4.2 User Guide Manual de usuario Pagina 145