Following are sub-types of SystemEventTypethat will be generated in response to a Refresh Methodscall. They are illustrated in Figure 23.
Figure 23– Refresh Related Event Hierarchy
This EventTypeis used by a Serverto mark the beginning of a Refresh Notificationcycle. Its representation in the AddressSpaceis formally defined in Table 99.
Table 99– RefreshStartEventType definition
Attribute |
Value |
||||
BrowseName |
RefreshStartEventType |
||||
IsAbstract |
True |
||||
References |
NodeClass |
BrowseName |
DataType |
TypeDefinition |
ModellingRule |
|
|
|
|
||
Subtype of the SystemEventTypedefined in OPC 10000-5, i.e. it has HasProperty Referencesto the same Nodes. |
This EventTypeis used by a Serverto mark the end of a Refresh Notificationcycle. Its representation in the AddressSpaceis formally defined in Table 100.
Table 100– RefreshEndEventType definition
Attribute |
Value |
||||
BrowseName |
RefreshEndEventType |
||||
IsAbstract |
True |
||||
References |
NodeClass |
BrowseName |
DataType |
TypeDefinition |
ModellingRule |
|
|
|
|
||
Subtype of the SystemEventTypedefined in OPC 10000-5, i.e. it has HasProperty Referencesto the same Nodes. |
This EventTypeis used by a Serverto indicate that a significant change has occurred in the Serveror in the subsystem below the Serverthat may or does invalidate the Conditionstate of a Subscription. Its representation in the AddressSpaceis formally defined in Table 101.
Table 101– RefreshRequiredEventType definition
Attribute |
Value |
||||
BrowseName |
RefreshRequiredEventType |
||||
IsAbstract |
True |
||||
References |
NodeClass |
BrowseName |
DataType |
TypeDefinition |
ModellingRule |
|
|
|
|
||
Subtype of the SystemEventTypedefined in OPC 10000-5, i.e. it has HasProperty Referencesto the same Nodes. |
When a Serverdetects an Eventqueue overflow, it shall track if any Condition Events have been lost, if any Condition Events were lost, it shall issue a RefreshRequiredEventType Eventto the Clientafter the Eventqueue is no longer in an overflow state.