To facilitate the calculation of different KPIs like for example OEE, the interface offers different item values with their changing times. These times allow to calculate the durations of different machine modes.

All of these relevant times are transferred with OPC UA mechanisms. Each state change is sent to the OPC UA client, and the timestamp can be used to calculate the time durations needed for KPI compilation.

Link to related chapter:

7.10 IWwUnitValuesType InterfaceType Definition