The SupportInfo Interface defines a number of additional data that a commonly exposed for Devices and their components. These include mainly images, documents, or protocol-specific data. The various types of information is organised into different folders. Each information element is represented by a read-only Variable. The information can be retrieved by reading the Variable value.

Figure 11 Illustrates the SupportInfo Interface. It is formally defined in Table 20.

Figure 11 –Support information Interface

Table 20 – ISupportInfoType definition

Attribute	Value
BrowseName	ISupportInfoType
IsAbstract	True
References	NodeClass	BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the BaseInterfaceType defined in OPC 10001-7
HasComponent	Object	DeviceTypeImage		FolderType	Optional
HasComponent	Object	Documentation		FolderType	Optional
HasComponent	Object	ProtocolSupport		FolderType	Optional
HasComponent	Object	ImageSet		FolderType	Optional

Clients need to be aware that the contents that these Variables represent may be large. Reading large values with a single Read operation may not be possible due to configured limits in either the Client or the Server stack. The default maximum size for an array of bytes is 1 megabyte. It is recommended that Clients use the IndexRange in the OPC UA Read Service (see OPC 10000-4) to read these Variables in chunks, for example, one-megabyte chunks. It is up to the Client whether it starts without an index and repeats with an IndexRange only after an error or whether it always uses an IndexRange.

The different types of support information are specified in 5.5.5.2 to 5.5.5.5.