Rockwell-automation FactoryTalk Historian SE DataLink 4.2 User Guide Uživatelský manuál stáhnout pdf (Strana 138)

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FactoryTalk Historian DataLink User Guide

130

Returns

See specific information for PICalcVal() outcodes (page 124).

Example:

The following calculates a time-weighted total for the expression

'cdf144'+'cdt158' from yesterday to today from the default

FactoryTalk Historian server:

=PIAdvCalcExpVal("'cdf144'+'cdt158'","y","t","total","time-

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.

PIAdvCalcExpFilVal()

Retrieves a filtered, calculated FactoryTalk Historian point value based on

an expression, using the following syntax:

PIAdvCalcExpFilVal(expression, stime, etime, 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

time format).

etime (string)

The end time (in FactoryTalk Historian time format).

filtexp (string)

The filter expression used to filter results.

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Rockwell-automation FactoryTalk Historian SE DataLink 4.2 User Guide Uživatelský manuál Strana 138