Replication schedules

Each real-time summary has a specified schedule, by which the summary is calculated and sent for storage to the next-tier Historian with the timestamp of the cycle.

There are two types of replication schedules:

• Periodic replication schedules
  You can configure a summary to replicate based on an cycle such as 1 minute, 5 minutes, 1 hour, 1 day, and so on. The cycle boundaries are calculated starting at midnight, lower-tier (originating) server local time, and continue in fixed time increments. The time between cycles is constant within a day even through a daylight savings change. Note that the last cycle in a day may be shorter to force replication at midnight. The calculation cycle starts at midnight. For example, a 13-minute cycle is stored at 12:00 a.m., 12:13, 12:26, ... 11:27 p.m., 11:40, 11:53, and then again at 12:00 a.m.

• Custom replication schedules
  Custom schedules force replication cycles to occur at fixed times of the day in lower-tier (originating) server local time. You choose the fixed times of day.