Chapter 13 CANopen Overview |C200 Series
13-3
Pre-Defined Connection Set
To reduce configuration effort for simple networks, CANopen define a mandatory default identifier
allocation scheme. The 11-bit identifier structure in predefined connection is set as follows:
COB Identifier (CAN Identifier)
10 9 8 7 6 5 4 3 2 1 0
Function Code Node Number
Object Function Code Node Number COB-ID Object Dictionary Index
Broadcast messages
NMT 0000 - 0 -
SYNC 0001 - 80H 1005H, 1006H, 1007H
TIME STAMP 0010 - 100H 1012H, 1013H
Point-to-point messages
Emergency 0001 1-127 81H-FFH 1014H, 1015H
TPDO1 0011 1-127 181H-1FFH 1800H
RPDO1 0100 1-127 201H-27FH 1400H
TPDO2 0101 1-127 281H-2FFH 1801H
RPDO2 0110 1-127 301H-37FH 1401H
TPDO3 0111 1-127 381H-3FFH 1802H
RPDO3 1000 1-127 401H-47FH 1402H
TPDO4 1001 1-127 481H-4FFH 1803H
RPDO4 1010 1-127 501H-57FH 1403H
Default SDO (tx) 1011 1-127 581H-5FFH 1200H
Default SDO (rx) 1100 1-127 601H-67FH 1200H
NMT Error Control 1110 1-127 701H-77FH 1016H, 1017H
CANopen Communication Protocol
It has services as follows:
NMT (Network Management Object)
SDO (Service Data Objects)
PDO (Process Data Object)
EMCY (Emergency Object)
NMT (Network Management Object)
The Network Management (NMT) follows a Master/Slave structure for executing NMT service. Only
one NMT master is in a network, and other nodes are regarded as slaves. All CANopen nodes have
a present NMT state, and NMT master can control the state of the slave nodes. The state diagram
of a node is shown as follows:
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