刚接触wincc，下面脚本是根据帮助文档VB实例修改，但读取不到归档内容，系统内置报警控件中能读到数据，请大神指点。
' 1.1 Create connection string for ADO access
Dim ProviderName
Dim CatalogName
Dim DataSourceName
Dim ConnectionString
Dim CommandString
Dim snam1,Rtname
Dim ServerName1
Set ServerName1 = HMIRuntime.Tags("@ServerName")
ServerName1.Read
Dim DatasourceNameRT
Set DatasourceNameRT = HMIRuntime.Tags("@DatasourceNameRT")
DatasourceNameRT.Read
Rtname=DatasourceNameRT.Value
snam1=ServerName1.Value
ConnectionString = "provider=WinCCOLEDBProvider.1;catalog=" & Rtname & ";data source=" & snam1 & "\WinCC"
' 1.2 Define command string for access (relative time range, last 10 minutes)
CommandString = "ALARMVIEW:Select * from algviewcht WHERE DateTime > '2017-11-30 00:00:00.000' "
Dim DBConnection
Dim DBCommand
Dim DBRecordset
' 2.1 Open connection
'HMIRuntime.Trace "before open connection" & vbNewLine
Set DBConnection = CreateObject("ADODB.Connection")
DBConnection.ConnectionString = ConnectionString
DBConnection.CursorLocation = 3
DBConnection.open
Set DBRecordset = CreateObject("ADODB.Recordset")
' 2.2 Execute command
'HMIRuntime.Trace "before execute command" & vbNewLine
Set DBCommand = CreateObject("ADODB.Command")
DBCommand.CommandType = 1
DBCommand.ActiveConnection = DBConnection
DBCommand.CommandText = CommandString
Set DBRecordset = DBCommand.Execute
Dim lngCount
Dim lngValue,aa
' 2.3 Record structure and first record data (test)
lngCount = DBRecordset.Fields.Count
aa = DBRecordset.RecordCount
HMIRuntime.Trace "RecordSet.Field.Count=" & lngCount & vbNewLine
HMIRuntime.Trace "RecordSet.RecordCount=" & aa & vbNewLine
If (aa>0) Then
DBRecordset.movefirst
Else
HMIRuntime.Trace "Selection returned no fields" & vbNewLine
End If
' 4.1 Clean up
DBRecordset.Close
Set DBRecordset = Nothing
Set DBCommand = Nothing
DBConnection.Close
Set DBConnection = Nothing
HMIRuntime.Trace "Connection closed again" & vbNewLine
问题补充：
数据库已经连接上，脚本调试输出如图，显示库中无数据。
图片说明：
最佳答案
Rtname=DatasourceNameRT.Value
snam1=ServerName1.Value
改成
Rtname=DatasourceNameRT.Read
snam1=ServerName1.Read
试试
详细参考：
WinCC数据开放性
https://support.industry.siemens.com/cs/cn/zh/view/78682604
在WinCC中如何使用VBS读取报警记录数据到EXCEL
https://support.industry.siemens.com/cs/cn/zh/view/77938393
WinCC、Excel、VBA、脚本、连通性软件包
https://support.industry.siemens.com/cs/cn/zh/view/71676391
WinCC/连通性软件包 V7.4 SP1
https://support.industry.siemens.com/cs/cn/zh/view/109746336
补充：
按我的方法试过了吗？
另外您可以先把WHERE去掉，直接查询所有的，试试，如果能查询到了，再加上条件
提问者对于答案的评价：
谢谢你的回答，找到问题出在哪儿了，软件语言是中文简体，查询的是繁体的归档数据库表，ALGVIEWEXCHT改为ALGVIEWEXCHS就可以了。
原创文章，作者：ximenziask，如若转载，请注明出处：https://www.zhaoplc.com/plc362472.html
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