Rockwell-automation FactoryTalk Historian SE DataLink 4.2 User Guide Manual do Utilizador descarregar pdf (Página 130)

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FactoryTalk Historian DataLink User Guide

122

Example:

The following calculates the square root of the value of the tag sinusoid

from the FactoryTalk Historian server thevax at one-hour intervals,

starting from midnight yesterday to midnight today:

=PIExpDat("sqr('sinusoid')","y","t","1h",1,"thevax")

It also displays the time stamps.

PITimeDat()

Retrieves sampled FactoryTalk Historian point values corresponding to a

specified array of time stamps, using the following syntax:

PITimeDat(tagname, timestamps, PIServer, mode)

Arguments

Argument

Explanation

tagname (string)

The tag name or names matching the desired FactoryTalk Historian

points.

timestamps

(reference)

A reference to an array of time stamps in FactoryTalk Historian time

format.

PIServer (string)

The target FactoryTalk Historian server.

mode (string)

The mode used to determine which values to retrieve.

Returns

Sampled data. If the time stamps are in a single column, the data are

returned along a single column. If the time stamps are in a single row, the

data are returned along a single row.

Example:

The following retrieves interpolated timed data for the times located in

cells B1 through B12 for the tag mytag from the default FactoryTalk

Historian server:

1 2 ... 125 126 127 128 129 130 131 132 133 134 135 ... 163 164

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Rockwell-automation FactoryTalk Historian SE DataLink 4.2 User Guide Manual do Utilizador Página 130