CAN-8123/CAN-8223/CAN-8423 user’s manual (Revision 3.00, May/22/2009) ------
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5.2 PDO Communication Set
5.2.1 PDO COB-ID Parameters
Before the real-time data are transmitted by the PDO, it is necessary to
check the COB-ID parameter of this PDO in the PDO communication objects.
This parameter setting controls the COB-ID of the PDO communication, which
is in 32 bits, and each bit with its meaning is given in the table follow.
Bit Number
Value
Meaning
31 (MSB)
0
PDO exits (PDO is valid)
1
PDO does not exist (PDO is not valid)
30
0
RTR allowed on this PDO
1
No RTR allowed on this PDO
29
0
11-bit ID (CAN 2.0A)
1
29-bit ID (CAN 2.0B)
28-11
0
If bit 29=0
x
If bit 29=1: 28-11 bits of 29-bit COB-ID
10-0 (LSB)
x
10-0 bits of COB-ID
Note: Only CAN-8123/CAN-8223/CAN-8423 supports CAN 2.0A.
In the following table, it’s regarding the default PDO COB-ID
parameters.
Default COB-ID of PDO
Number of PDO
Bit10~Bit7
(Function Code)
Bit6~Bit0
TxPDO1 0011 Node
ID
TxPDO2 0101 Node
ID
TxPDO3 0111 Node
ID
TxPDO4 1001 Node
ID
RxPDO1 0100 Node
ID
RxPDO2 0110 Node
ID
RxPDO3 1000 Node
ID
RxPDO4 1010 Node
ID