IsOnline 
Used to bind the offline representation of a Device to the online representation.
The representation of the IsOnline ReferenceType in the address space is shown in the following table:
| Name | Attribute |
|---|---|
| NodeId | ns=1;i=6031 |
| NamespaceUri | http://opcfoundation.org/UA/DI/ |
| BrowseName | IsOnline |
| NodeClass | ReferenceType |
| InverseName | OnlineOf |
| Symmetric | False |
| IsAbstract | False |
| SubtypeOf | Aggregates |
| Categories | DI Offline |