The WriterGroupIdwith DataType UInt16is an identifier for the WriterGroupand shall be unique across all WriterGroupsfor a PublisherId.All values, except for 0, are valid. The value 0 is defined as null value.

The PublishingIntervalwith the DataType Durationdefines the interval in milliseconds for publishing NetworkMessagesand the embedded DataSetMessagescreated by the related DataSetWriters.

In the case of Eventbased DataSets, this may result in zero to many DataSetMessagesproduced for one PublishedDataSetin a PublishingInterval. All Eventsthat occur between two PublishingIntervalsshall be buffered until the next NetworkMessageis sent. If the number of Events exceeds the buffer capability of the DataSetWriter, an Eventof type EventQueueOverflowEventTypeis inserted into the buffer.

The Duration DataTypeis a subtype of Doubleand allows configuration of intervals smaller than a millisecond.

The KeepAliveTimewith DataType Durationdefines the time in milliseconds until the Publishersends a keep alive DataSetMessagein the case where no DataSetMessagewas sent in this period by a DataSetWriter. The minimum value shall equal the PublishingInterval.

The Prioritywith DataType Bytedefines the relative priority of the WriterGroupto all other WriterGroupsacross all PubSubConnectionsof the Publisher.

If more than one WriterGroupneeds to be processed, the priority number defines the order of processing. The highest priority is processed first.

The lowest priority is zero and the highest is 255.

The LocaleIdswith DataType LocaleIddefines a list of locale ids in priority order for localized strings for all DataSetWritersin the WriterGroup. The first LocaleIdin the list has the highest priority.

If the Publishersends a localized String, the Publishershall send the translation with the highest priority that it can. If it does not have a translation for any of the locales identified in this list, then it shall send the Stringvalue that it has and include the LocaleIdwith the String. If no locale id is configured, the Publishershall use any that it has. See OPC 10000-3for more detail on LocaleId.

This Structure DataTypeis used to represent the configuration parameters for WriterGroups. It is a subtype of PubSubGroupDataTypedefined in 0.

The WriterGroupDataTypeis formally defined in Table 22.

Table 22– WriterGroupDataType Structure

Name

Type

Description

WriterGroupDataType

Structure

writerGroupId

UInt16

Defined in 6.2.5.1.

publishingInterval

Duration

Defined in 6.2.5.2.

keepAliveTime

Duration

Defined in 6.2.5.3.

priority

Byte

Defined in 6.2.5.4.

localeIds

LocaleId[]

Defined in 6.2.5.5.

headerLayoutUri

String

transportSettings

WriterGroupTransportDataType

Transport mapping specific WriterGroupparameters. The abstract base type is defined in 6.2.5.6.2. The concrete subtypes are defined in the sections for transport mapping specific parameters.

messageSettings

WriterGroupMessageDataType

NetworkMessagemapping specific WriterGroupparameters. The abstract base type is defined in 6.2.5.6.3. The concrete subtypes are defined in the sections for message mapping specific parameters.

dataSetWriters

DataSetWriterDataType[]

The DataSetWriters contained in the WriterGroup. The DataSetWriterparameters are defined in 6.2.3.

The WriterGroupDataType Structurerepresentation in the AddressSpaceis defined in Table 23.

Table 23– WriterGroupDataType Definition

Attributes

Value

BrowseName

WriterGroupDataType

IsAbstract

False

References

NodeClass

BrowseName

IsAbstract

Subtype of PubSubGroupDataType defined in 0.

This Structure DataTypeis an abstract base type for transport mapping specific WriterGroupparameters. The abstract DataTypedoes not define fields.

The WriterGroupTransportDataType Structurerepresentation in the AddressSpaceis defined in Table 24.

Table 24– WriterGroupTransportDataType Definition

Attributes

Value

BrowseName

WriterGroupTransportDataType

IsAbstract

True

References

NodeClass

BrowseName

IsAbstract

Description

Subtype of Structure defined in OPC 10000-5.

HasSubtype

DataType

DatagramWriterGroupTransportDataType

FALSE

Defined in 6.4.1.2.3.

HasSubtype

DataType

BrokerWriterGroupTransportDataType

FALSE

Defined in 6.4.2.2.6.

This Structure DataTypeis an abstract base type for message mapping specific WriterGroupparameters. The abstract DataTypedoes not define fields.

The WriterGroupMessageDataType Structurerepresentation in the AddressSpaceis defined in Table 25.

Table 25– WriterGroupMessageDataType Structure

Attributes

Value

BrowseName

WriterGroupMessageDataType

IsAbstract

True

References

NodeClass

BrowseName

IsAbstract

Description

Subtype of Structure defined in OPC 10000-5.

HasSubtype

DataType

UadpWriterGroupMessageDataType

FALSE

Defined in 6.3.1.1.7.

HasSubtype

DataType

JsonWriterGroupMessageDataType

FALSE

Defined in 6.3.2.1.2.