You can define the properties of a variable.
- Unit
You can either accept the transferred unit or define your own unit. - Acquisition category:
Here you define how the value is acquired and stored. The acquisition category is linked directly to an aggregation function. As soon as you use the variable in a widget, the respective aggregation function is automatically selected:- Process value (ProcessValue) => aggregation function: Average
- Power value (Power) ⇒ aggregation function: Average
- Consumption value (Energy) ⇒ aggregation function: Sum
- Flow value (Flow) ⇒ aggregation function: Average
- Quantity value (Amount) ⇒ aggregation function: Sum
- Count value (Counter) ⇒ aggregation function: Counter
When you select the acquisition category "Counter", you can define additional settings for each counter used.
Additional information on the counting method of the individual counters can be found here: Define the acquisition category "Counter" - Status value (State)
- "The value is aggregated" function
If the value is not aggregated, the values are continuously (actual values) transferred to Industrial Edge when the value changes. The currently transferred value is valid until the next value is transferred to Industrial Edge. When the value is aggregated, the value is always valid for the last cycle, for example, 15 minutes.
You can find additional information on the aggregation functions here: Additional aggregation functions in Performance Insight
Data gaps
Data gaps occur, for example, when the connection to the network is interrupted. No data from the plant is transferred during the interruption.
When you have activated the "The value is aggregated" function and are using an acquisition category with the "Sum" aggregation function, data gaps will distort the final result.