DataChange Delegate

Represents a method that will handle a change in data

Parameters

sender

Instance of the Tag class that invoked the Changed event.

e

Data associated with the change.

Remarks

Change event will only fire when the Active property = true and under the following conditions:

ReadTag or GroupRead detects a change in the Value property Controller.ReadTag or Controller.GroupRead detects a change in the QualityCode property,

Example

VB
Dim MyPLC As New GELink.Controller("192.168.1.45")
Dim WithEvents MyTag As New GELink.Tag("%R1")
' * add the event handler
AddHandler MyTag.Changed,  AddressOf MyTag_Changed
' * Read the tag
MyPLC.ReadTag(MyTag)
' * Event Handler
Private Sub MyTag_Changed(ByVal sender As Object, ByVal e As GELink.DataChangeEventArgs) Handles Tag1.Changed)
  If e.QualityCode = ResultCode.QUAL_GOOD Then
    Console.WriteLine(e.Value.ToString())
  End If  
End Sub


 


C#

GELink.Controller MyPLC = new GELink.Controller("192.168.1.45");

GELink.Tag MyTag = new GELink.Tag("%R1") 

// add the event handled 

MyTag.Changed += new MyTag.ChangedEventHandler(MyTag_Changed);

 

// read the tag 

MyPLC.ReadTag(myTag); 

 

// event handler 

void MyTag_Changed(ByVal sender As Object, ByVal e As GELink.DataChangeEventArgs) Handles Tag1.Changed) 

{  

if( e.QualityCode == ResultCode.QUAL_GOOD)    

   Console.WriteLine(e.Value.ToString()); 

}

 

Namespace: GELink

Assembly: INGEAR.NET.GELink (in INGEAR.NET.GELink.dll)

See Also

GELink Namespace