Reload Tag Parameters

Whenever you modify certain tag parameters, the following collectors reload only the modified tags without restarting the collectors.

  • OPC Collector
  • iFIX Collector
  • Calculation Collector
  • Simulation Collector
  • Server to Server Collector
  • PI Collector
  • PI Distributor
For a tag to stop and restart the collection without restarting the collector, you must enable the On-line Tag Configuration Changes option on the Advanced tab of the Collector Maintenance screen. By default, the On-line Tag Configuration Changes option is enabled.

If you disable the On-line Tag Configuration Changes option, any changes you make to the tags do not affect collection until after you restart the collector. To restart the collector you must stop and start the collector service or executable. Restarting the collector stops and restarts the tag(s) collection and records bad data samples to the collection. All the collector configuration changes done within a 30 second time frame are batched together and applied to the collector. If the modified tags get zero bad markers and available runtime values at the same time, then precedence is given to available runtime values instead of zero bad markers.

It is recommended that you update/modify a small set of tags at a time to collect the modified data faster. It is recommended to you disable the On-line Tag Configuration Changes option while updating large sets of tags at the same time, and restart the collector after modification.

Tag Properties that Cause the Tag Collection to Stop and Restart

Changes to the following tag properties cause an updated/modified tag to stop and restart the collection, when the On-Line Tag Configuration Changes option is enabled:
  • Collector Name
  • Collector Type
  • SourceAddress
  • Spare 1 5
  • Data Type
  • Collection Interval
  • Collection Offset
  • Collection Disabled/Enabled (CollectionDisabled in SDK)
  • Collection Type
  • TimeStampType
  • Calculation Dependencies (in SDK) or Calculation Triggers (in the Historian Administrator) applies to Server-to-Server and Calculation Collectors only

Tag Properties that Do Not Cause the Tag Collection to Stop and Restart

The following tag properties do not cause the tag collection to stop and restart, but the collectors use these new values immediately (when the On-Line Tag Configuration Changes option is enabled):
  • High Engineering Units
  • Low Engineering Units
  • Input Scaling
  • High Scale
  • Low Scale
  • Collector Compression
  • Collector Deadband Percent Range
  • Collector Compression Timeout