8.2.2 NodeIds for single instances
To access POWERLINK Objects on a Server, which represents only one POWERLINK Object Dictionary the size of the NodeId is 4 byte and the format is defined in shown in Table 48.
| Byte | Description |
| 0 | LSB of the objects POWERLINK Index |
| 1 | HSB of the objects POWERLINK Index |
| 2 | POWERLINK Sub-Index |
| 3 | DataTypeId |
Byte 0, 1 and 2 are the values of the POWERLINK addressing scheme Index / Sub-Index. If the POWERLINK Object requested by Index/Sub-Index is not existing the server shall signal this case with the StatusCode Bad_NodeIdUnknown.
With byte 3 the client specifies the expected DataType of the response data by using the built-in types defined in OPC 10000-6. Allowed values are 1 to 12, as well as 15. If byte 3 is set to 12 or 15 (String or ByteString) the server shall respond with the same length like the POWERLINK Object. Otherwise, if the bit-length of the referenced POWERLINK Object is different to the bit-length of the requested DataType, the Server shall signal this case with the StatusCode Bad_NodeIdInvalid.