Your button action will need to call a script function to both cause the action and then raise an additional event log message.
The following function will log a message:
'Helper function to write a log message
Public Sub LogInterfaceEvent(DBObject, Time, Severity, EventText)
If Not DBObject Is Nothing Then
DBObject.Interface.LogInterfaceEvent LocalTimeToUTC( Time),Severity, EventText
End If
End Sub
You could add this to a script library.
Your code which executes the control/override/setpoint will use something like:
Set controlObj = Server.FindObject( Server.GetOPCValue( "..relative path to point.FullName" ) )
This will be the first argument to the function above, and also a means to execute the action, using controlObj.Interface. etc
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