Use the Analog values at discrete transition analysis wizard

Use the Analog Values at Discrete Transition Analysis wizard to graph analog tag values at discrete tag transitions.

To analyze an analog tag at a discrete transition:

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

2. Select Analog values at discrete transition 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 tag and Discrete tag lists, specify the names of the tags to analyze. Click the ellipsis button to open the Tag Picker and browse for the tags. 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. 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.

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

10. 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.

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

    

    In this example:

    A1: Server

    A2: Discrete Tag

    A3: Analog Tag

    A4: Row or resolution

    A5: Start Time

    A6: Duration

12. 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:

    =wwDiscreteWideHistory(A1,A2,"Row" & A4,"Rel",A6 & "(" & A5 & ")","",TRUE, FALSE)

    Each cell in F2:

    =wwAnalogWideHistory(A1,A3,"Row1",B2,B2,FALSE," ",TRUE,FALSE)

    where the "B2, B2," portion of the function is the associated column used to determine the analog value at the time of the discrete tag transition.

    There are "hidden" values that appear in a font that matches the worksheet background. These values are used for the chart.

    

13. 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.

    Keep in mind that changing the time arguments may return a different number of rows in the result set, causing the analysis to be incorrect.