测试了啊
不过现在的程序我按万斑竹的第二个提议改了
不用建内部变量i了
第一段：
Option Explicit
Function action
Dim fso,myfile,daystr,dstr,fname
dstr = FormatDateTime(Date)
fname="d:\" + dstr + ".xls"
Set fso = CreateObject("s cripting.FileSystemObject")
Set MyFile = fso.GetFile("d:\ExcelExample.xls")
MyFile.Copy (fname)

End Function
第二段：
Option Explicit
Function action
Dim fso,myfilep,daystr,dstr,fname
Set fso = CreateObject("s cripting.FileSystemObject")
dstr = FormatDateTime(Date)

HMIRuntime.Tags("i").write fso.GetAbsolutePathName("")
fname=HMIRuntime.ActiveProject.Path++dstr+.xls

Dim ObjExcelApp

Set objExcelApp = CreateObject("Excel.Application")
objExCelApp.Visible = True
objExcelApp.Workbooks.Open fname

Dim i
i=1

Do While objExcelApp.worksheets ("sheet1").Cells(i, 1).VAlue<>""
i=i+1
Loop


objExcelApp.worksheets ("sheet1").Cells(i, 2).VAlue = HMIRuntime.Tags("I-COD").read
objExcelApp.worksheets ("sheet1").Cells(i, 3).VAlue = HMIRuntime.Tags("I-SS").read
objExcelApp.worksheets ("sheet1").Cells(i, 4).VAlue = HMIRuntime.Tags("I-PH").read
objExcelApp.worksheets ("sheet1").Cells(i, 5).VAlue = HMIRuntime.Tags("I-F").read
objExcelApp.worksheets ("sheet1").Cells(i, 6).VAlue = HMIRuntime.Tags("I-FI").read
objExcelApp.worksheets ("sheet1").Cells(i, 7).VAlue = HMIRuntime.Tags("O-COD").read
objExcelApp.worksheets ("sheet1").Cells(i, 8).VAlue = HMIRuntime.Tags("O-SS").read
objExcelApp.worksheets ("sheet1").Cells(i, 9).VAlue = HMIRuntime.Tags("O-NH4N").read
objExcelApp.worksheets ("sheet1").Cells(i, 10).VAlue = HMIRuntime.Tags("0-P").read
objExcelApp.worksheets ("sheet1").Cells(i, 11).VAlue = HMIRuntime.Tags("O-F").read
objExcelApp.worksheets ("sheet1").Cells(i, 12).VAlue = HMIRuntime.Tags("O-FI").read
objExcelApp.worksheets ("sheet1").Cells(i, 1).VAlue =Now
objExcelApp.ActiveWorkbook.Save
objExcelApp.Workbooks.ClosE
objExcelApp.QuiT

Set ObjEXceLapp = Nothing

End Function
其中objExCelApp.Visible = True可以去掉，就是后台操作了
这两段程序分别是两个动作
第一段的触发周期是一天，作用是复制另存ExcelExample.xls，并改名为当天日期
第二段是忘当天的excel文件里写数据的，触发周期根据个人情况，测试时可以定为10秒，就是每10秒写一次数据
另外第二段里的HMIRuntime.Tags都是我wincc里的变量，要根据自己的情况修改