The Tags Section

The Tags section, shown in the following figure, displays the following information.

Note: Not all options in the Tags section are available to all collectors.
  • Default Tag Names
  • Default Collection
  • Default Compression

Default Tag Names

If the value of the tag prefix is modified, a new set of enumerated sets prefixed with the updated value will be added to Historian server. The enumerated sets prefixed with the old value will not be deleted and will not receive any further updates.

Field Description
Add Prefix to Tag Displays a prefix, if any, that is automatically added to all tag names when you browse and pick on the specified collector.

To change the prefix, enter a new text string and select the Update button at the bottom of the page. This field applies to all collectors except File and Calculation collectors.

Naming Convention When digital sets are automatically added via the OSI PI Collector:
  • The enumerated set added to Historian is prefixed using the value configured here. For Example, if "IP- 4LJPD02." has been as configured as the tag prefix value, then the digital set with name "SYSTEMSET" in PI Historian will be added as an enumerated set with name "IP-4LJPD02.SYSTEMSET" in Historian.
  • If the value of the tag prefix is modified, then a new set of enumerated sets prefixed with the updated value will be added to Historian server. The enumerated sets prefixed with the old value will not be deleted and will not receive any later updates.
Table 1. Default Collection
Field Description
Collection Interval The time in milliseconds, seconds, minutes, or hours required to complete a poll of a given tag on the selected collector. It is also used in unsolicited collection. In effect, it specifies how frequently data can be read from a tag. The collection interval can be individually configured for each tag. To change it, enter a new value.
Note: To avoid collecting repeat values with the OPC Collector when using device timestamps, specify a collection interval that is greater than the OPC Server update rate.
Collection Type Whether this collector is configured for polled data collection or unsolicited collection.
Time Assigned By Whether the timestamp for the data value is supplied by the collector or the data source. To change it, select a different type.

Default Compression

These parameters are the default compression values applied to new tags added by selecting from the Add Multiple Tags From Collector window.

Field Description
Collector Compression Whether or not collector compression is enabled as a default setting. To change it, select the other option. This option is overridden by per-tag settings.
Deadband The default setting of the collector compression deadband in absolute or percentage range values.
Compression Timeout The default setting for the collector compression time-out for tags added through the Add Multiple Tags From Collector window. You must enable the Collector Compression option to use this field.
Spike Logic Control Spike logic monitors incoming data samples for spikes in a tag's values. If spike logic is enabled, a sample of equal value to the previously archived sample is inserted into the archive in front of the spike value. For more information, refer to Spike Logic.