This EventType is defined in OPC 10000-3. Its representation in the AddressSpace is formally defined in Table 47.

Table 47 – AuditWriteUpdateEventType definition

Attribute

Value

BrowseName

AuditWriteUpdateEventType

IsAbstract

True

References

NodeClass

BrowseName

DataType

TypeDefinition

ModellingRule

Subtype of the AuditUpdateEventType defined in 6.4.24, which means it inherits the InstanceDeclarations of that Node.

HasProperty

Variable

AttributeId

UInt32

PropertyType

Mandatory

HasProperty

Variable

IndexRange

NumericRange

PropertyType

Mandatory

HasProperty

Variable

NewValue

BaseDataType

PropertyType

Mandatory

HasProperty

Variable

OldValue

BaseDataType

PropertyType

Mandatory

Conformance Units

Auditing Write

This EventType inherits all Properties of the AuditUpdateEventType. The SourceName for Events of this type shall be "Attribute/Write". Their semantic is defined in 6.4.24.

AttributeId identifies the Attribute that was written. The SourceNode Property identifies the Node that was written.

IndexRange identifies the index range of the written Attribute if the Attribute is an array. If the Attribute is not an array or the whole array was written, the IndexRange is set to null.

NewValue identifies the value that was written. If the IndexRange is provided, only the values in the provided range are shown.

OldValue identifies the value that the Attribute contained before the write. If the IndexRange is provided, only the value of that range is shown. It is acceptable for a Server that does not have this information to report a null value.

Both the NewValue and the OldValue will contain a value in the DataType and encoding used for writing the value.