An MDIS Server shall include an instance of the MDISInformationObjectType under the Objects folder.

Figure 24 – MDIS Instance illustration

Any other structure under in the MDIS Server is vendor or project specific. Figure 24 provides an illustration of one possible instance structure, it is not the only available structure. Several of the items are optional and might not appear. The valve signature objects illustrate that valves might include multiple signatures for a given valve, no signatures for a given valve and that the single folder might contain signature from multiple trees. The naming use is project / vendor specific but might have to handle all of these cases. Signatures might also exist for other objects such as chokes.

The MDISInformation node is formally defined in Table 119.

Table 119 – MDISInformation definition

Attribute	Value
BrowseName	MDISInformation
References	NodeClass	BrowseName	TypeDefinition
OrganizedBy by the Objects Folder defined in OPC 10000-5
HasTypeDefinition	ObjectType	MDISInformationObjectType
ConformanceUnits