Cyclic retrieval - how it works

The following illustration shows how values are returned for cyclic retrieval:

Data is retrieved in cyclic mode with a start time of TC0 and an end time of TC2. The resolution has been set in such a way that the historian returns data for three cycle boundaries at TC0, TC1, and TC2. Each dot in the graphic represents an actual data point stored on the historian. From these points, the following are returned:

• At TC0: P2, because it falls right on the cycle boundary

• At TC1: P7, because it is the last point before the cycle boundary

• At TC2: P11, for the same reason