从SCADA系统导出数据

Question

我正在尝试创建VBscript，以便从SCADA系统(WinCC RT专业版)导出过程数据，以便定期存档所有过程变量。数据存储在可通过连接包访问的SQL表中。我设法使脚本在导出一个标记(过程变量)时工作，但我想循环遍历系统中的所有标记(大约60个)，将它们收集到另一个记录集中，然后将该记录集中的所有数据保存在一个csv文件中。我已经创建了收集一个标签(时间，过程变量等)的所有变量(字段)的RecSet，我只需要字段4中的值(所有标签的相同字段)。然后我想将这个字段复制到另一个记录集中- RecSetColl，它从所有标签中收集所有需要的数据(字段4)，最后将它们保存在CSV文件中。非常感谢你的帮助。

Sub DataExport()

Dim fso         'FileSystemObject
Dim f           'File
Dim ts          'TextStream
Dim path        'Path
Dim ArchiveDate 'Archive date

'Name of CSV-file
ArchiveDate = ArchiveDate & Now
ArchiveDate = Replace(ArchiveDate,"/","")
ArchiveDate = Replace(ArchiveDate," ","")
ArchiveDate = Replace(ArchiveDate,":","")
ArchiveDate = "MDF_" & ArchiveDate

'Path to the csv-file
path = "D:\Historical_data\" & ArchiveDate & ".csv"

'Create Filesystemobject and CSV-file if not exists:
Set fso = CreateObject("Scripting.FileSystemObject")
If Not fso.FileExists(path) Then
    fso.CreateTextFile(path)
Else
    MsgBox "File already exists!"
    Exit Sub
End If 

'Create object and open it for writing
Set f = fso.GetFile(path)
Set ts = f.OpenAsTextStream(2,-2)

ts.WriteLine("Tag-Name;ValueID;Date/Time;Process-Value")    'Header

'Generate String for the CSV-Filename
Dim Pro         'Provider
Dim DSN         'Data Source Name
Dim DS          'Data Source
Dim ConnString  'Connection String
Dim MachineNameRT   'Name of the PC from WinCC-RT
Dim DSNRT       'Data Source Name from WinnCC-RT

Dim Conn        'Connection to ADODB
Dim RecSet      'RecordSet
Dim RecSetColl  'RecordSet storing data to be saved to the CSV-file
Dim Command     'Query 
Dim CommandText 'Command-Text
Dim i

'Read the name of the PC-Station and the DSN-Name from WinCC-RT
Set MachineNameRT = HMIRuntime.Tags("@LocalMachineName")
Set DSNRT = HMIRuntime.Tags("@DatasourceNameRT")

'Preparing the Connection-String
Pro = "Provider=WinCCOLEDBProvider.1;"  'First instance of WinCCOLEDB
DSN = "Catalog=" & DSNRT.Read & ";"     'Name of Runtime-Database
DS = "Data Source=" & MachineNameRT.Read & "\WinCC" 'Data Source

'Build the complete String:
ConnString = Pro + DSN + DS

'Make Connection
Set Conn = CreateObject("ADODB.Connection")
Conn.ConnectionString = ConnString
Conn.CursorLocation = 3
Conn.open

Set RecSetColl = CreateObject("ADODB.Recordset")

With RecSetColl.Fields
    .Append "Time1", adChar
    .Append "AHU_RUN", adChar
    .Append "Time2", adChar
    .Append "TT01", adChar
    .Append "TT02", adChar
End With


For i = 0 To 4  

    Set RecSet = CreateObject("ADODB.Recordset")                
    Set Command = CreateObject("ADODB.Command")

    Command.CommandType = 1

    Set Command.ActiveConnection = Conn

    'Building the complete string
    CommandText = "Tag:R," & i & ",'0000-00-00 12:00:00.000','0000-00-00 00:00:00.000'"

    Command.CommandText = CommandText

    Set RecSet = Command.Execute

    RecSet.MoveFirst

    RecSetColl.Fields(i) = RecSet.Fields(4) 'RecSet.Fields(4) stores a proces value

    RecSet.Close
    Set RecSet = Nothing
    Set Command = Nothing
Next

'Writing recordsets to CSV-file
Do While Not RecSetColl.EOF
    ts.WriteLine (RecSetColl.Fields(0).Value & ";" & RecSetColl.Fields(1).Value & ";" & RecSetColl.Fields(2).Value & ";" & RecSetColl.Fields(3).Value & ";" & RecSetColl.Fields(4).Value & ";" & RecSetColl.Fields(5).Value)
    RecSetColl.MoveNext 
Loop

RecSetColl.Close
Set RecSetColl = Nothing
Conn.close
Set Conn = Nothing

ts.Close
Set fso = Nothing
Set f = Nothing
Set ts = Nothing

End Sub

Answer 1

我真的不知道什么是不起作用的，只是一个猜测；

您的项目中是否存在ValueID =0( "for 0 to 4“中的"i”)？

在“存档”表中，您将在“我的所有项目”中找到以"1“开头的有效ValueID。在SQL Management Studio中很容易看到，有时可能存在0。

要获得所有导出的值，首先查询"Archive“表，然后使用返回的任何ValueID在循环中请求数据。

//PerD