Use the Scatter analysis wizard

Use the Scatter Analysis wizard to create a scatter plot of two analog tags.

To create a scatter plot:

1. On the Historian tab, in the Tag Management group, click Tag Analysis. The Tag Analysis dialog box appears.

2. Select Scatter analysis.

3. Click Next. The Tag Analysis - Step 2 of 4 dialog box appears.

4. In the Servers list, click the name of the server to use.

5. In the Analog tags list, specify the name of the tags to analyze. Click the ellipsis button to open the Tag Picker and browse for the tag. For more information, see Tag Picker.

6. Click Next. The Tag Analysis - Step 3 of 4 dialog box appears.

7. In the Starting time list, enter the starting time for the query. Click the arrow button to select a date from a calendar.

8. (optional) To show data for a second time period in the same scatter plot, enter a second starting time in the Starting time for second time period list. Click the arrow button to select a date from a calendar.

   Using a second time period allows you to view differences in operation for two time periods.

9. In the Duration lists, specify the duration and the duration unit. For example, 10 minutes. The duration is used to calculate the end date for the query.

10. Click Next. The Tag Analysis - Step 4 of 4 dialog box appears.

11. Configure the resolution for the data to be returned.

    • Number of rows: The number of rows to be returned for a specified time period. For cyclic retrieval, the rows are spaced evenly across the time period, and the default row count is 50 rows. For cyclic retrieval, the row count is applied for each tag in a query.

    • Values spaced every: The sampling rate, in milliseconds, for retrieving the data in cyclic mode.

12. Click Finish. Information that you specified using the wizard is assigned to cells in the worksheet. For example:

    

    For this example:

    A1: Server

    A2: Tag 1

    A3: Tag 2

    A4: Row or resolution

    A5: Start Time 1

    A6: Duration

    A7: Start Time 2

13. Click in the workbook to view the functions that are inserted to create the analysis report.

    In this example, click in the following cells to view the functions.

    Cell B2:

    =wwAnalogWideHistory(A1,A2:A3, "Row" & A4,"Rel",A6 & "(" & A5 & ")",FALSE," ",FALSE,FALSE)

    Cell D2:

    =wwAnalogWideHistory(A1, A2:A3, "Row" & A4,"Rel",A6 & "(" & A7 & ")",FALSE," ", FALSE, FALSE)

14. Optionally alter the results by changing values that appear in the first column of the worksheet.

    If the calculation mode is set to automatic, any changes you make to the values in this column are immediately reflected in the worksheet.