Rockwell-automation FactoryTalk Historian SE DataLink 4.2 User Guide Manual de usuario descargar pdf (Pagina 69)

5 ● Module Database Objects

●

 Click in the desired output cell, and then choose PI > <function

name> to open a function dialog box (XP-2003), or click a function on

the FactoryTalk Historian ribbon to open a new function task pane

(2007).

You cannot resolve an alias or property object into a tag name without a

module path. The path provides a context for the alias that maps it to a specific

FactoryTalk Historian point.

Module Database functions use common function components (page 17).

Alias to Tag

Returns a FactoryTalk Historian tag name corresponding to a specified

FactoryTalk Historian alias.

Required

Arguments

 Alias

 Module Path

 Query Date

Alias

Specify a FactoryTalk Historian alias name. An alias can be entered

directly or referenced in a cell. You can also browse to an alias in the

FactoryTalk Historian Module Database.

Module Path

Type the module path from the FactoryTalk Historian Module

Database where the specified alias can be found. The module path is

entered automatically if the alias argument is selected by browsing

the Module Database.

Query Date

Specify a date to retrieve a specific version of the alias.

Property to Value

Returns the value or values corresponding to a specified FactoryTalk

Historian property.

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Rockwell-automation FactoryTalk Historian SE DataLink 4.2 User Guide Manual de usuario Pagina 69