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Kepware Knowledge Base: Solution


How Do Snapshots Work with Triggers?


Last Update: 07.11.2018

Snapshots can only be configured for Absolute and Exception trigger types, which are used to place the log group in and out of a triggered state based on specified conditions. A snapshot logs the values that the server holds for log items when the log group enters or departs a triggered state. The two snapshot options are Start Snapshot and Stop Snapshot, and either one or both can be selected. The following scenarios describe how snapshots would be handled. The scenarios assume that the trigger has both start and stop snapshots enabled.

  • The log group is disabled and the trigger condition has not been met when the log group is enabled. No snapshot will be taken.
  • The log group is disabled and the trigger condition has been met when the log group is enabled. A snapshot will be taken.
  • The log group is enabled and the trigger condition has not been met when the log group is disabled. No snapshot will be taken.
  • The log group is enabled and the trigger condition has been met when the log group is disabled. A snapshot will be taken.
  • The log group is enabled and the trigger condition to a triggered state. A snapshot is taken.
  • The log group is enabled and the trigger condition changes to a non-triggered state. A snapshot is taken.

The reasons to use a snapshot vary, but they are used most commonly when there is anticipation that the data in the log group may not be logged for some time after entering the triggered state. The snapshot ensures that the data is logged at least once.

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