Integral retrieval - how it works

Calculating values for a cycle in integral retrieval is a two-step process:

• First, the historian calculates the area under the graph created by the data points. This works the same as in average retrieval. For more information, see Average retrieval.

• After this area has been found, it is scaled using the value of the IntegralDivisor column in the EngineeringUnit table. This divisor expresses the conversion factor from the actual rate to one of units per second.

For example, if the time-weighted average for a tag during a 1-minute cycle is 3.5 liters per second, integral retrieval returns a value of 210 for that cycle (3.5 liters per second multiplied by 60 seconds).