System bus (CAN / CAN−AUX) configuration
Diagnostics codes
CAN bus load (C0361/2461)
8
179
EDBCSXA064 EN 3.2
8.10.3 CAN bus load (C0361/2461)
Use C0361/C2461 to determine the bus load through the controller or the individual data
channels in percent. Faulty telegrams are not considered.
Bus load of the individual subcodes:
C0361/C2461 Meaning
Subcode 1 All telegrams sent
Subcode 2 All telegrams received
Subcode 3 Telegrams sent of CAN1_OUT/CANaux1_OUT
Subcode 4 Telegrams sent of CAN2_OUT/CANaux2_OUT
l Always "0"; channel is not used!
Subcode 5 Telegrams sent of CAN3_OUT/CANaux3_OUT
l Always "0"; channel is not used!
Subcode 6 Telegrams sent from parameter data channel 1
Subcode 7 Telegrams sent of parameter data channel 2
Subcode 8 Telegrams received of CAN1_IN/CANaux1_OUT
Subcode 9 Telegrams received of CAN2_IN/CANaux2_OUT
l Always "0"; channel is not used!
Subcode 10 Telegrams received of CAN3_IN/CANaux3_OUT
l Always "0"; channel is not used!
Subcode 11 Telegrams received from parameter data channel 1
Subcode 12 Telegrams received of parameter data channel 2
The data transfer is limited. The limits are determined by the number of telegrams
transmitted per time unit and the baud rate.
The limits can be determined during data exchange in a drive network by adding all drives
involved under C0361/1 or C2461/1.
Example:
Drives/host system (PLC) Bus load
C0361/1 − controller 1 23.5 %
C0361/1 − controller 2 12.6 %
Host system (PLC) 16,0 %
52.1 % (total)
Two drives and the host system (PLC) are interconnected via the CAN bus.
Note!
ƒ Max. bus load of all devices involved: 80 %
ƒ If other devices are connected, as for instance decentralised inputs and
outputs, their telegrams must be taken into consideration.
ƒ If the time between the individual sync telegrams is too short the bus can be
overloaded.
– Remedy: Change the synchronisation cycle of the host system (PLC) and
the controller (C1121).
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