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
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Attribute |
Value |
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BrowseName |
RefreshStartEventType |
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IsAbstract |
True |
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References |
NodeClass |
BrowseName |
DataType |
TypeDefinition |
ModellingRule |
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Subtype of the SystemEventTypedefined in OPC 10000-5, i.e. it has HasProperty Referencesto the same Nodes. |
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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
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Attribute |
Value |
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BrowseName |
RefreshEndEventType |
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IsAbstract |
True |
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References |
NodeClass |
BrowseName |
DataType |
TypeDefinition |
ModellingRule |
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Subtype of the SystemEventTypedefined in OPC 10000-5, i.e. it has HasProperty Referencesto the same Nodes. |
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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
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Attribute |
Value |
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BrowseName |
RefreshRequiredEventType |
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IsAbstract |
True |
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References |
NodeClass |
BrowseName |
DataType |
TypeDefinition |
ModellingRule |
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Subtype of the SystemEventTypedefined in OPC 10000-5, i.e. it has HasProperty Referencesto the same Nodes. |
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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.