Rockwell-automation FactoryTalk Historian SE DataLink 4.2 User Guide Manual de usuario descargar pdf (Pagina 137)

9 ● FactoryTalk Historian DataLink Function Reference

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will be sampled at the compressed events of cdf144. 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.

PIAdvCalcExpVal()

Retrieves a calculated FactoryTalk Historian point value based on an

expression, using the following syntax:

PIAdvCalcExpVal(expression, stime, etime, 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

time format).

etime (string)

The end time (in FactoryTalk Historian time format).

mode (string)

The type of calculation to be used to compute point values.

calcbasis (string)

The weighting method used to calculate values.

sampmode (string)

The sampling method used for calculation expressions.

sampfreq (string)

The frequency used for interpolated sampling.

minpctgood (number)

The minimum percentage of good data required to calculate and

return a value.

cfactor (number)

The time unit of flow for the source tag, required for Total

calculations.

outcode (integer)

An ouput code, either 0, 1, 2, 4, 5, 6, or 7, and not 3.

PIServer (string)

The target FactoryTalk Historian server.

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Rockwell-automation FactoryTalk Historian SE DataLink 4.2 User Guide Manual de usuario Pagina 137