Table 45 defines the HistoryEvent parameter used for Historical Event reads.
The HistoryEvent defines a table structure that is used to return Event fields to a Historical Read. The structure is in the form of a table consisting of one or more Events, each containing an array of one or more fields. The selection and order of the fields returned for each Event are identical to the selected parameter of the EventFilter.
Table 45 – HistoryEvent structure
|
Name |
Type |
Description |
|
HistoryEvent |
Structure |
This structured datatype is a subtype of Structure defined in OPC 10000-3 |
|
Events [] |
HistoryEventFieldList |
The list of Events being delivered. |
|
eventFields [] |
BaseDataType |
List of selected Event fields. This will be a one-to-one match with the fields selected in the EventFilter. |
Its representation in the AddressSpace is defined in Table 46.
Table 46 – HistoryEvent definition
|
Attribute |
Value |
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|
BrowseName |
HistoryEvent |
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|
IsAbstract |
False |
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|
References |
NodeClass |
BrowseName |
DataType |
TypeDefinition |
Other |
|
|
Subtype of the Structure defined in OPC 10000-3 |
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|
Conformance Units |
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|
Historical Access Events |
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|
Historical Access Modified Events |
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