
4th edition, 9-11-2018
7000.05050, 4th edition, 9-11-2018
7000.05050
CANopen protocol description
16
3.3
Identifier distribution
The Communication Object Identifier (COB-ID) consists of a 7-bit node address (Node-ID)
and a 4-bit function code.
Fig. 5:
Identifier distribution
The Predefined-Connection-Set defines the standard identifier for the most important
objects.
Tab. 3:
Standard identifier
The COB-IDs of the PDOs, the SYNC objects and the emergency objects can be changed via
the communication parameters in the object dictionary. The COB-ID of the SDO telegram
cannot be changed and is always derived from the node number.
The data assignment of the PDOs is pre-set to the “PDO set for servo drive” as specified
in CiA 402 V3, but can be changed by the user (dynamic PDO mapping).
Object
Function code
(binary)
Resulting COB-ID
Object index for communica-
tion setting
NMT
0000
0
–
SYNC
0001
128 (80 h)
1005 h
EMERGENCY
0001
129 (81h) to 255 (FFh)
1014 h
PDO1 (tx)
0011
385 (181h) to 511 (1FFh)
1800 h
PDO1 (rx)
0100
513 (201h) to 639 (27Fh)
1400 h
PDO2 (tx)
0101
641 (281h) to 767 (2FFh)
1801 h
PDO2 (rx)
0110
769 (301h) to 895 (37Fh)
1401 h
PDO3 (tx)
0111
897 (381h) to 1023 (3FFh)
1802 h
PDO3 (rx)
1000
1025 (401h) to 1151 (47Fh)
1402 h
PDO4 (tx)
1001
1153 (481h) to 1279 (4FFh)
1803 h
PDO4 (rx)
1010
1281 (501h) to 1407 (57Fh)
1403 h
SDO (tx)
1011
1409 (581h) to 1535 (5FFh)
1200 h
SDO (rx)
1100
1537 (601h) to 1663 (67Fh)
1200 h
NMT error control
1110
1793 (701h) to 1919 (77Fh)
–
Function
Code
10
Bit-No.:
COB-Identifier
Priority
0
Node-ID
0
10 high
low