若只读取数据，可以使用DataChange事件，当控制器中所要访问的数据一旦发生改变时将会触发该事件，并将该数据自动读到Txt文本框。
Private Sub MyOPCGroup_DataChange(ByVal TransactionID As Long, ByVal NumItems As Long, ClientHandles() As Long, Items() As Variant, Qualities() As Long, TimeStamps() As Date)
‘自动刷新数据
Dim i As Long
For i = 1 To NumItems
txt(ClientHandles(i)) = Items(i)
‘获取项的值
txtTime(ClientHandles(i)) = TimeStamps(i)
‘获取项的时间戳
txtQuantity(ClientHandles(i))=GetQualityString(Qualities(i))
‘获取项的品质
Next i
End Sub
(5) 断开OPC服务器
MyOPCServer.OPCGroups.RemoveAll
‘移除所有OPC Group，空出资源
Set MyOPCGroup = Nothing
MyOPCServer.Disconnect
‘断开连接
注意：在VB中还要引用 siemens opc daautomation 2.0。
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本文关键字：暂无联系方式PLC入门，plc技术 - PLC入门
