{"id":3728,"date":"2019-03-25T17:45:41","date_gmt":"2019-03-25T20:45:41","guid":{"rendered":"http:\/\/xexeu.elipse.com.br\/pt\/accessing-opc-ae-drivers-events-individually\/"},"modified":"2019-05-29T10:22:59","modified_gmt":"2019-05-29T13:22:59","slug":"accessing-opc-ae-drivers-events-individually","status":"publish","type":"post","link":"https:\/\/kb.elipse.com.br\/en\/accessing-opc-ae-drivers-events-individually\/","title":{"rendered":"Accessing OPC A&E driver’s events individually."},"content":{"rendered":"
The EventBlock tag is a read-only, 18-element tag that returns a data block for each alarm or event received by the driver. Each read in this tag can return anything from 0 (zero) to “n” events. Events can be accessed individually by the application via OnRead <\/i>event<\/p>\n

Accessing the events requires no specific method, you will only need to link the desired elements to a historic, for example, and run WriteRecord <\/i>method in the block’s OnRead<\/i> event. In the historic, each element must be linked to a field, according to their datatype. <\/p>\n

\"\"<\/div>\n

Example of script:<\/p>\n

Sub <\/font>EventBlock_OnRead()<\/font>
Application.GetObject<\/font>(“Hist1”<\/font>).WriteRecord()     <\/font>
End Sub<\/font><\/div>\n

Depending on the number of points to be monitored, another alternative is to write a script in EventBlock tag’s OnRead <\/i>event to check the status of each point individually. Each item to be monitored will need an internal tag, which can later be added to a digital alarm or just be visualized on screen. <\/p>\n

Example of script monitoring whether the alarm is in or out in item Point_072:

<\/font><\/p>\n

Sub<\/font> EventBlock_OnRead()<\/font>
Set <\/font>Source = Item(“Source”<\/font>)<\/font>
Set <\/font>Message = Item(“Message”<\/font>)<\/font>
Set <\/font>Point_072 = Application.GetObject<\/font>(“Dados.Point_072”<\/font>) ‘Internal Tag<\/font><\/font><\/p>\n

 If<\/font> Source.Value = “gv.Area_001.Point_072”<\/font> And <\/font>Message.Value = “2503”<\/font> Then<\/font><\/font>
 Point_072.Value = true<\/font><\/font>
 Elseif <\/font>Source.Value = “gv.Area_001.Point_072”<\/font> And <\/font>Message.Value = “6064”<\/font> Then<\/font><\/font>
 Point_072.Value = false<\/font><\/font>
 End if<\/font><\/font><\/p>\n

End Sub<\/font><\/div>\n

In this example, the Message <\/i>block element informs the alarm’s status (in\/out) according to yhe code being displayed. <\/div>\n","protected":false},"excerpt":{"rendered":"

The EventBlock tag is a read-only, 18-element tag that returns a data block for each alarm or event received by the driver. 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