Rockwell-automation FactoryTalk Historian SE DataLink 4.2 User Guide Manual de usuario descargar pdf (Pagina 48)

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FactoryTalk Historian DataLink User Guide

Time Interval

Type a time interval as a

FactoryTalk Historian time

(page 86)

expression. The interval is the sampling frequency used to collect or

calculate values over the course of the time range.

For example, an interval of 15m (15 minutes) returns a value for

every 15 minute interval.

Filter Expression

Add a filter expression to filter event values using a mathematical

expression, eliminating data for which the expression evaluates as

false. The filter expression is applied to the raw data from FactoryTalk

Historian (and not values that result from the calculation itself).

For example, the simple filter expression:

sinusoid < 70

would remove all values over 70 from the calculation. You can also

use any valid PI performance equation in the filter expression to build

more complex expressions to remove atypical peaks in data values,

for example.

Select mark as filtered to substitute

Filtered

as a placeholder for

each value or block of values filtered from the array based on the

filter

expression

(page 91).

Special Notes

You can use a

FactoryTalk Historian Expression

(page 91) instead of a

tag name for this function.

Reference a range of tag names to display sampled values for each.

Note that by default, values are displayed in rows for a column of

referenced tags, and in columns for a row of referenced tags.

The PISampFilDat() function is used if a filter expression is specified;

otherwise, the PISampDat() function is used.

PIExpDat() is used if a PI Expression is substituted for a tag.

Example:

To see periodic, interpolated values over the previous 24 hours for the

sinusoid tag, the following arguments are set for the Sampled Data

function:

Tagname = sinusoid

Start Time = -1d

End Time = <cell reference to current time>

Time Interval = 3h

show timestamps

column

1 2 ... 43 44 45 46 47 48 49 50 51 52 53 ... 163 164

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