LWORD 
It describes that the type is used as bit string of length 64.
The representation of the LWORD DataType in the address space is shown in the following table:
| Name | Attribute |
|---|---|
| NodeId | ns=1;i=3004 |
| NamespaceUri | http://PLCopen.org/OpcUa/IEC61131-3/ |
| BrowseName | LWORD |
| IsAbstract | False |
| SubtypeOf | UInt64 |
| Categories |