Parameters – OPC Unified Architecture

Table 94 defines the parameters for the Service.

Table 94 – TransferSubscriptions Service Parameters

Name	Type	Description
Request
requestHeader	RequestHeader	Common request parameters (see 7.32 for RequestHeader definition).
subscriptionIds []	IntegerId	List of identifiers for the Subscriptions to be transferred to the new Client (see 7.19 for IntegerId definition). These identifiers are transferred from the primary Client to a backup Client via external mechanisms.
sendInitialValues	Boolean	A Boolean parameter with the following values: TRUE the first Publish response(s) after the TransferSubscriptions call shall contain the current value for each data MonitoredItem in the Subscription where the Monitoring Mode is set to Reporting. If a value is queued for a data MonitoredItem, the next value in the queue is sent in the Publish response. If no value is queued for a data MonitoredItem, the last value sent is repeated in the Publish response. FALSE the first Publish response after the TransferSubscriptions call shall contain only the value changes since the last Publish response was sent. This parameter only applies to MonitoredItems used for monitoring Attribute changes. The data should be sent in the next regular PublishingInterval.

Response
responseHeader	ResponseHeader	Common response parameters (see 7.33 for ResponseHeader definition).
results []	TransferResult	List of results for the Subscriptions to transfer. The size and order of the list matches the size and order of the subscriptionIds request parameter. This structure is defined in-line with the following indented items.
statusCode	StatusCode	StatusCode for each Subscription to be transferred (see 7.38 for StatusCode definition).
availableSequence Numbers []	Counter	A list of sequence number ranges that identify NotificationMessages that are in the Subscription’s retransmission queue. This parameter is null or empty if the transfer of the Subscription failed. The Counter type is defined in 7.8.
diagnosticInfos []	DiagnosticInfo	List of diagnostic information for the Subscriptions to transfer (see 7.12 for DiagnosticInfo definition). The size and order of the list matches the size and order of the subscriptionIds request parameter. This list is empty if diagnostics information was not requested in the request header or if no diagnostic information was encountered in processing of the request.