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6.3 ObjectTypes for the Server Object ToC Previous Next

6.3.10 NonTransparentNetworkRedundancyType ToC Previous Next index

This ObjectType is a subtype of NonTransparentRedundancyType and is used to identify the capabilities of the OPC UA Server for non-transparent network redundancy. It is formally defined in Table 18.

Table 18 – NonTransparentNetworkRedundancyType Definition

Attribute Value
BrowseName NonTransparentNetworkRedundancyType
IsAbstract False

Subtype of the NonTransparentRedundancyType defined in 6.3.9, which means it inherits the InstanceDeclarations of that Node.

References NodeClass BrowseName DataType TypeDefinition ModellingRule
HasProperty Variable ServerNetworkGroups NetworkGroupDataType[] PropertyType Mandatory

Clients switching between network paths to the same Server behave the same as HotAndMirrored redundancy. Server and network redundancy can be combined. In the combined approach it is important for the Client to know which ServerUris belong to the same Server representing different network paths and which ServerUris represent different Servers. Therefore, a Server implementing non-transparent network redundancy shall use the NonTransparentNetworkRedundancyType to identify its redundancy support.

RedundancySupport is inherited from the ServerRedundancyType. It shall be set to COLD_1, WARM_2, HOT_3 or HOT_AND_MIRRORED_5 for all instances of the NonTransparentNetworkRedundancyType. If no Server redundancy is supported (the ServerUriArray only contains one entry), the RedundancySupport shall be set to HOT_AND_MIRRORED_5.

The ServerNetworkGroups contains an array of NetworkGroupDataType. The URIs of the Servers in that array (in the serverUri of the structure) shall be exactly the same as the ones provided in the ServerUriArray. However, the order might be different. Thus the array represents a list of HotAndMirrored redundant Servers. If a Server only supports network redundancy, it has only one entry in the ServerNetworkGroups. The networkPaths in the structure represents the redundant network paths for each of the Servers. The networkPaths describes the different paths (one entry for each path) ordered by priority. Each network path contains an endpointUrlList having an array of Strings each containing a URL of an Endpoint. This allows using different protocol options for the same network path.

The Endpoints provided shall match with the Endpoints provided by the GetEndpoints Service of the corresponding Server.

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