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11/20/2018
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3.3 Object Dictionary
The object dictionary structures the data of a CANopen device in a clear tabular
arrangement. It contains all device parameters as well as all current process data,
which are accessible thereby also about the SDO.
Figure 4: Structure of the Object Dictionary
3.4 CANopen default identifier
CANopen devices can be used without configuration in a CANopen network. Just the
setting of a bus address and the Baud rate is required. From this node address the
identifier allocation for the communication channels is derived.
COB-Identifier = Function Code + Node-ID
10
0
1
2
3
4
1
2
3
4
5
6
7
Function Code
Node-ID
Examples
Object
Function Code
COB-ID
Index Communication Parameter
NMT
0000bin
0
–
SYNC
0001bin
80h
1005
PDO1 (tx)
0011bin
181h
– 1FFh
1800h