AMT58x-CB CANopen®
21
6.7 SDO objects
SDO messages are used to set and read values from the object
dictionary of the encoder.
These parameters are described in the “Object dictionary” section.
4 bytes at the most are used for CAN data, other 4 bytes are used for
Command, Index and Sub-index fields. SDO messages are always
followed by confirmation. It follows that when Master sends a SDO
message to Slave, slave always sends a reply (and a warning,
should an error occur).
SDO structure:
IDENTIFIER
from 4 to 8 CAN data bytes
COB-ID(hex)
0 1 2 3 4 5 6 7
F.C
.
Node-
ID
Com
Index
Sub
Data
1byt
e
LSB MSB
1byt
e
LSB
… …
MSB
Com command
Index parameter
index
Sub parameter
sub-index
Data parameter
value
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