B.2 Use case: List topology
| Use Case | List Topology | |
|---|---|---|
| Description | The OPC UA client shows the topology in a hierarchical tree to the user. The tree is provided by an OPC UA server for FDT OPC Information Model. If the OPC UA server supports a network topology, it is provided according to the 'Device Integration Host Model' defined in OPC UA DI. | |
| Stakeholder | ||
| Preconditions | Topology is available in OPC UA Server | |
| Post conditions | User can see the topology in a hierarchy | |
| Actors | Engineer, Expert, Observer | |
| Trigger | Whenever a user needs a list of devices for further access | |
| Frequency | ||
| Description | ||
| Step | Action | |
| 1 | User triggers connect from OPC Client to OPC Server | |
| 2 | User starts browsing from node 2:DeviceTopology | |
| 3 | OPC Client displays the topology to the user | |
| Exceptions | ||
| Requirements | User has access permissions to the server | |
| Notes | Network/communication topology Physical topology | |
| Open Issues | ||