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這段代碼在WINCC6.2中可以讀出歸檔數據，在WINCC7.0中為什么卻完全讀不出來歸檔數據呢？
求高手指導�。。�！急急�。。。。�！

Dim sPro, sDsn, sSer, sCon, sSql
    Dim conn, oRs, oCom
    Dim DSNName
    Dim i As Integer
    Dim sStart, sStop As String
    
Sub get_wincc_data()

    '--Get Database DSN name-----------------------------------
    Set DSNName = CreateObject("CCHMIRuntime.HMIRuntime")
    sDsn = DSNName.Tags("@DatasourceNameRT").Read
    
    '--build connection string-----------------------------------
    sPro = "Provider=WinCCOLEDBProvider.1;"
    sDsn = "Catalog=" & sDsn & ";"
    sSer = "Data Source=ZHANG\WinCC"
    sCon = sPro & sDsn & sSer
    Set conn = CreateObject("ADODB.Connection")
    conn.ConnectionString = sCon
    conn.CursorLocation = 3
    conn.Open
    Set oRs = CreateObject("ADODB.Recordset")
    Set oCom = CreateObject("ADODB.Command")
    oCom.CommandType = 1
    Set oCom.ActiveConnection = conn
    
  
    sStart = Year(DTPicker1.Value) & "-" & Month(DTPicker1.Value) & "-" & Day(DTPicker1.Value) & " 00:00:00"
    sStop = Year(DTPicker1.Value) & "-" & Month(DTPicker1.Value) & "-" & Day(DTPicker1.Value) & " 23:00:00"
    
  
     sStart = DateAdd("h", -8, CDate(sStart))
     sStop = DateAdd("h", -8, CDate(sStop))
    
  
     sSql = "Tag:R,('ProcessValueArchive\Fan1_T1'),'" & sStart & "','" & sStop & "' order by datetime"
     oCom.CommandText = sSql
    Set oRs = oCom.Execute
    If (oRs.EOF) Then
       oRs.Close
    Else
        oRs.MoveFirst
        i = 0
        Do While Not oRs.EOF
        Sheet1.Cells(i + 4, 2) = oRs.Fields("RealValue").Value
        oRs.MoveNext
        i = i + 1
        Loop
        oRs.Close
    End If
  

    sSql = "Tag:R,('ProcessValueArchive\Fan1_T2'),'" & sStart & "','" & sStop & "' order by datetime"
    oCom.CommandText = sSql
    Set oRs = oCom.Execute
    If (oRs.EOF) Then
       oRs.Close
    Else
        oRs.MoveFirst
        i = 0
        Do While Not oRs.EOF
        Sheet1.Cells(i + 4, 3) = oRs.Fields("RealValue").Value
        oRs.MoveNext
        i = i + 1
        Loop
        oRs.Close
    End If

    sSql = "Tag:R,('ProcessValueArchive\Fan1_P1'),'" & sStart & "','" & sStop & "' order by datetime"
    oCom.CommandText = sSql
    Set oRs = oCom.Execute
    If (oRs.EOF) Then
        oRs.Close
    Else
        oRs.MoveFirst
        i = 0
        Do While Not oRs.EOF
        Sheet1.Cells(i + 4, 4) = oRs.Fields("RealValue").Value
        oRs.MoveNext
        i = i + 1
        Loop
        oRs.Close
    End If
    
  
    sSql = "Tag:R,('ProcessValueArchive\Fan1_P2 '),'" & sStart & "','" & sStop & "' order by datetime"
    oCom.CommandText = sSql
    Set oRs = oCom.Execute
  
    If (oRs.EOF) Then
       oRs.Close
    Else
        oRs.MoveFirst
        i = 0
        Do While Not oRs.EOF
        Sheet1.Cells(i + 4, 5) = oRs.Fields("RealValue").Value
        oRs.MoveNext
        i = i + 1
        Loop
        oRs.Close
    End If
    
Set oRs = Nothing
Set conn = Nothing
End Sub


Private Sub DTPicker1_Change()
clear_cell get_wincc_data
End Sub

Sub clear_cell()
For i = 4 To 27
  For j = 2 To 5
  Cells(i, j) = ""
  Next j
Next i
End Sub

是不是因為ConnectivityPack沒有授權的緣故呢？