Siemens SINAMICS G List Manual page 583

Remedy: 2: Reduce the cycle times of the SDO receive messages.
3: Check the bus cable.
Set a higher baud rate (p8622).
Check the bit timing and if required optimize (p8623).
A08754 CBC: Incorrect communications mode
Reaction: NONE
Acknowledge: NONE
Cause: An attempt was made to make a change at parameters p8700 - p8737 while the CAN node was in the operational
mode.
Remedy: Change into the pre-operational or stopped mode.
A08755 CBC: Obj cannot be mapped
Reaction: NONE
Acknowledge: NONE
Cause: PDO mapping is not possible for the object.
Remedy: Use an object intended for the PDO mapping or enter 0.
The following objects can be mapped in the receive PDO:
0x6040, 0x6060, 0x60FF, 0x6071.
The following objects can be mapped in the transmit PDO:
0x6041, 0x6061, 0x6063, 0x6069, 0x606B, 0x606C, 0x6074.
Note:
As long as A8755 is present, the COB-ID cannot be set to valid.
A08756 CBC: Number of mapped bytes exceeded
Reaction: NONE
Acknowledge: NONE
Cause: The number of bytes of the mapped objects exceeds the telegram size for net data (max. 8 bytes).
Remedy: Map fewer objects or objects with a smaller data type.
Maximum possible are:
2 objects of data type 4 bytes.
4 objects of data type 2 bytes.
See also: p8710, p8711, p8712, p8713, p8714, p8715, p8716, p8717, p8730, p8731, p8732, p8733, p8734, p8735,
p8736, p8737
A08757 CBC: Set COB-ID invalid
Reaction: NONE
Acknowledge: NONE
Cause: For online operation, the appropriate COB-ID must be set invalid before mapping.
Example:
Mapping for RPDO 1 should be changed (p8710[0]).
--> set p8700[0] = C00006E0 hex (invalid COB-ID)
--> set p8710[0] as required.
--> p8700[0] enter a valid COB-ID
Remedy: Set the COB-ID to invalid.
A08758 CBC: Number of CAN channels too low
Reaction: NONE
Acknowledge: NONE
Cause: The number of CAN channels in p8740 has either been set to 0 or too low.
See also: p8740
Remedy: The number of channels set in p8740 must be greater than or equal to the number of PDOs.
There are 2 possibilities:
Increase the number of channels in p8740 and confirm the selection using p8741.
Reduce the number of PDOs by setting the COB-ID to invalid.
See also: p8740, p8741
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SINAMICS G List Manual, Edition 12.2004
Faults and Alarms
List of faults and alarms
3-583