Rockwell-automation FactoryTalk Historian SE ActiveView 3.2 User Guide Manual de usuario descargar pdf (Pagina 70)

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FactoryTalk Historian ActiveView User Guide

The read-only Display property is the dispatch interface of the opened

display. It may be "Nothing" (in Visual Basic terms) if the loading of the

display failed. Error trapping can be implemented via the

DisplayURLIsValid property and the FailedDisplayURL event.

This is a nearly fully-functional Display object. You could build a Web-

based version of FactoryTalk Historian ProcessBook that would put trends

into a display. It is one of the most powerful features of this FactoryTalk

Historian ActiveView ActiveX control.

Example

Following are examples for accessing the Display object of the opened

display.

Pbd1.Display.SetTimeRange "*-4h", "*-1h"

Pbd1.Display.BackgroundColor = RGB(256,0,0) 'Red

Dim MyTime as string

MyTime = Pbd1.Display.EndTime

DisplayURL Property

The read-write DisplayURL property specifies the location of the

FactoryTalk Historian ProcessBook display file (.pdi). This parameter is

required to display a .pdi.

It can be set to a URL string. HTTP and FTP protocols are supported. You

may also use a UNC path or a local path to a display. For the UNC and

local paths, the protocol prefix file: is optional.

This property also supports relative paths, but you must specify the

absolute path the first time you set the control's DisplayURL property.

After that, you can specify a DisplayURL that is relative to the initial path.

The protocol may or may not be specified in the relative path. You cannot

specify a different protocol in the relative path. Also, the property always

returns the absolute path.

For example, you can specify

http://myserver/mydir1/mydisplay1.pdi first, and then

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Rockwell-automation FactoryTalk Historian SE ActiveView 3.2 User Guide Manual de usuario Pagina 70