To access POWERLINK Objectson a Server, which represents only one POWERLINK Object Dictionarythe size of the NodeIdis 4 byte and the format is defined in shown in Table 48.

Table 48– NodeIds for single instances

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 Objectrequested 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 DataTypeof 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 (Stringor ByteString) the server shall respond with the same length like the POWERLINK Object. Otherwise, if the bit-length of the referenced POWERLINK Objectis different to the bit-length of the requested DataType,the Servershall signal this case with the StatusCode Bad_NodeIdInvalid.