Rockwell-automation FactoryTalk Historian SE DataLink 4.2 User Guide Manual de usuario descargar pdf (Pagina 98)

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FactoryTalk Historian DataLink User Guide

Data Type

Support

Digital (defined states)

supported

Int (16 and 32)

supported

Float (16, 32 and 64)

supported

String (text)

supported

Timestamp

supported

Blob

not supported

FactoryTalk Historian Expressions

FactoryTalk Historian expressions (also known as FactoryTalk Historian

Performance Equations) are used for functions that incorporate

mathematical operations and calculations based on FactoryTalk Historian

points.

For some functions you can substitute a PI Expression for a tag name to

calculate values as they are retrieved from the FactoryTalk Historian

server. Functions that allow an expression argument include both PI Tag

and PI Expression buttons in the function dialog box or task pane.

To base a function on a FactoryTalk Historian calculation expression:

1. Click the PI Expression button at the top of the function dialog box or

task pane.

The Tagname(s) field becomes an Expression(s) field. Other fields

may activate, or become inactive.

2. Type the expression directly in the Expression(s) field, or use the field

to reference a cell containing an expression.

Using field references allow you to specify multiple expressions for a

function. Remember that an expression in a referenced cell is a string,

and should be preceded by an apostrophe.

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Rockwell-automation FactoryTalk Historian SE DataLink 4.2 User Guide Manual de usuario Pagina 98