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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