About Collection of Raw Samples

To minimize the effect of missing samples, we recommend that you view collected data on the destination with interpolated queries rather than raw data queries.

Here are some suggestions about how best to configure your system when you want raw samples of collected tags to match on the source and the destination. This is often not achievable, but here are some tips:
  • Use the formula Result=CurrentValue("TriggerTag").
  • Do not use collector compression on the destination tag.
  • Use archive compression on the destination if it is set on the source.

    The reason for this is that unsolicited triggers occur based on value changes, not based on what is stored in the archive. A value change may not be stored on the destination if archive compression is being used. It is up to the destination tag to apply the archive compression before the value is stored.

  • Use event-based triggers with 0 ms collection intervals.
  • In the Server-to-Server collector, disable the Synchronize Timestamps to Server option in the Advanced section in the collector configuration in Historian Administrator.