Advanced Tab

To display or edit advanced parameters, click the Advanced Tab.

The screen shown in the following figure appears.



To modify the values, enter new values in the appropriate fields and then click the Update button at the bottom of the screen to apply the changes. Until you click the Update button, entering a new value changes the display of the field name to blue.

The fields in the Advanced tab contain the following information:

Table 1. Data Collection Options
FieldDescription
Time Assigned By The source of the timestamp for a data value is either the collector or the data source.
Note: This field is disabled for Calculation and Server-to-Server tags.

All tags, by default, have their time assigned by the collector. When you configure a tag for a polled collection rate, the tag is updated based on the collection interval. For example, if you set the collection interval to 5 seconds with no compression, then the archive will be updated with a new data point and timestamp every 5 seconds, even if the value isn't changing.

However, if you change the Time Assigned By field to Source for the same tag, the archive only updates when the device timestamp changes. For example, if the poll time is still 5 seconds, but if the timestamp on the device does not change for 10 minutes, no new data will be added to the archive for 10 minutes.

Time Zone Bias The number of minutes from GMT that should be used to translate timestamps when retrieving data from this tag. For example, the time zone bias for Eastern Standard time is -300 minutes (GMT-5).

This property is not used during collection. Use this option if a particular tag requires a time zone adjustment during retrieval other than the client or server time zone. For example, you could retrieve data for two tags with different time zones by using the tag time zone selection in the iFIX chart.

Time Adjustment If the Server-to-Server Collector is not running on the source computer, select the Adjust for Source Time Difference option to compensate for the time difference between the source archiver computer and the collector computer.
Note: The Time Adjustment field only applies to Server-to-Server tags that use a polled collection type.
Data Store Displays the Data Store the tag belongs to.

Refer to Implementing Historian Security for definitions of the various security levels and groups.

Table 2. Security
FieldDescription
Read Group The Windows security group assigned to the selected tag. Refer to Implementing Historian Security for definitions of the various security levels and groups.
Write Group The Windows security group assigned to the selected tag.
Administer GroupThe Windows security group assigned to the selected tag.
Table 3. Audit
FieldDescription
Last Modified The date the last tag parameter modification was made.
Modified By The name of the person who last modified the tag configuration parameters.