The NumericIntervalDeltaHistoryExt component is a customized NumericIntervalHistoryExt used to log delta values from a Numeric Point which represents a totalized (ever-increasing) value.
The NumericCovDeltaHistoryExt component is located in the vykonPro palette under the history sub folder.
Delta Logging
If true the history extension will log the change in value of the parent numeric point's out property compared to the last history record value instead of the current value.
Use Rollover
If true, when the currentValue is less than the lastValue the delta is calculated using the maxRolloverValue from the history extension as delta = (maxRolloverValue - lastValue) + currentValue. Otherwise the delta value is calculated as the difference between the currentValue and lastValue, which could potentially be a negative value as delta = currentValue - lastValue