The IStatisticsType is an Interface to manage statistical data of any kind, and provides general information about those statistical data.
The concrete statistical data are managed in DataVariables referenced from the Object or ObjectType implementing the Interface with a HasStatisticComponent Reference, either directly or indirectly. Those Variables are not predefined by the Interface, but added by the concrete Objects or ObjectTypes implementing the Interface. In Figure 10, an example is given. The MyStatisticsType is implementing IStatisticsType and provides the statistical Variables StatVar_A and its subvariable StatVar_A1, as well as StatX and StatY, groups by the Object StatGroup. The Property StartTime applies to all of them, as well as the Method ResetStatistics.
Figure 10 Example of the usage of the IStatisticsType Interface
IStatisticsType is formally defined in Table 38.
Table 38 – IStatisticsType Definition
Attribute 
Value 

BrowseName 
IStatisticsType 

IsAbstract 
True 

Description 
Base interface for managing statistical data. 

References 
Node Class 
BrowseName 
DataType 
TypeDefinition 
Other 
Subtype of the BaseInterfaceType defined in OPC 100005 i.e. inheriting the InstanceDeclarations of that Node. 

0:HasProperty 
Variable 
StartTime 
0:DateTime 
0:PropertyType 
O 
0:HasComponent 
Method 
ResetStatistics 


O 
StartTime provides the information, at what point in time all statistical data, provided by the Object implementing the Interface, have been started to be collected. The StartTime changes when the collection of the statistical data is reset.
Note that the StartTime does not indicate, if the statistical data is aggregated from the start time, or rolled over after some specific condition. This is defined by subtypes of the IStatisticsType. Therefore, it is recommended not to use the IStatisticsType directly, but only subtypes of it.
The InstanceDeclarations of the IStatisticsType have the Attribute values defined in Table 39.
Table 39 – IStatisticsType Attribute values for child Nodes
Source Path 
Value 
Description 
StartTime 
 
Indicates the point in time at which the collection of the statistical data has been started. 
ResetStatistics 
 
Restarts all statistical data, including a reset of the StartTime to the current time. 