vb通过OPC 连接访问s7300+.
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‘添加OPC组对象
MyOPCGroup.IsSubscribed= True
‘设置该组数据为后台刷新
MyOPCGroup.IsActive = True
‘设置该组为激活状态
MyOPCGroup.UpdateRate=1000
‘设置数据刷新时间为1000
(3) 添加数据项
Dim abItemIDs() As String
‘项标识符
Dim abClientHandles() As Long
‘客户端句柄
Dim abServerHandles() As Long
‘服务器端句柄
Dim abErrors() As Long
Dim i As Long
ItemCount=3
abItemIDs(1) = " S7:[S7 connection_1]IB1"
abItemIDs(2) = " S7:[S7 connection_1]MB1"
abItemIDs(3) = " S7:[S7 connection_1]QB1"
for i="1" t0 3
abClientHandles(i) = i
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