OPC UA EventTypes – OPC UA for Field Device Tool (FDT)

8 OPC UA EventTypes

8.1 Overview

In order to support audit trail, new audit trail event types are defined (see Figure 11).

8.2 FdtAuditEventType

The FdtAuditEventType is an event type for general events (e.g. for device status update). It is formally defined in Table 23.

Table 23 – FdtAuditEventType Definition

Attribute		Value
BrowseName		FdtAuditEventType
IsAbstract		False

References	NodeClass		BrowseName	DataType	TypeDefinition	Other
Subtype of the 0:AuditEventType defined in OPC UA 10000-3 Address Space Model 9.5, which means it inherits the InstanceDeclarations of that Node.

8.3 FdtStartMethodEventType

The FdtStartMethodEventType is an event type for indication of start of execution of a command function. It is formally defined in Table 24.

Table 24 – FdtStartMethodEventType Definition

Attribute		Value
BrowseName		FdtStartMethodEventType
IsAbstract		False

References	NodeClass		BrowseName	DataType	TypeDefinition	Other
Subtype of the 0:AuditUpdateMethodEventType defined in 8.2, which means it inherits the InstanceDeclarations of that Node.

8.4 FdtEndMethodEventType

The FdtEndMethodEventType is an event type for indication of end of execution of a command function. It is formally defined in Table 25.

Table 25 – FdtEndMethodEventType Definition

Attribute		Value
BrowseName		FdtEndMethodEventType
IsAbstract		False

References	NodeClass		BrowseName	DataType	TypeDefinition	Other
Subtype of the 0:AuditUpdateMethodEventType defined in 8.2, which means it inherits the InstanceDeclarations of that Node.
0:HasProperty	Variable		Result	FunctionExecutionResultState	0:PropertyType	M

The property Result is used to indicate the result of the function execution.

8.5 FdtAuditWriteUpdateEventType

The FdtAuditWriteUpdateEventType is used to indicate the change of a parameter value. It is formally defined in Table 26.

Table 26 – FdtAuditWriteUpdateEventType Definition

Attribute			Value
BrowseName			FdtAuditWriteUpdateEventType
IsAbstract			False

References		BrowseName	DataType	TypeDefinition	Other
Subtype of the 0:AuditWriteUpdateEventType defined in OPC UA 10000-3 Address Space Model 9.27, which means it inherits the InstanceDeclarations of that Node.
0:HasProperty	Variable	OldUnit	0:String	0:PropertyType	O
0:HasProperty	Variable	NewUnit	0:String	0:PropertyType	O

The property OldUnit may be used to indicate the unit of the old value. The property NewUnit may be used to indicate the unit of the new value. If the source node of the event has an engineering unit, it is mandatory to provide these properties.