# Text Description Action
4265 ? CAN: Receive Init Buffer
Overflow
The CAN bus receive buffer that process‐
es messages from uninitialized CAN
cards has overflowed. Initialization will
likely fail.
Contact Customer Support.
4266 ? CAN: Receive Heartbeat
Buffer Overflow
CAN card heartbeat replies have over‐
flowed the heartbeat buffer. The heart‐
beat buffer is large enough to hold replies
from all 20 cards. Overflow would indi‐
cate a serious loading problem.
Contact Customer Support.
4267 ? CAN: Receive I/O Buffer
Overflow
CAN card I/O replies/updates are not
processing fast enough. This indicates
that some received CAN messages have
been lost because the CAN bridge can‐
not process them fast enough. Since
CAN messages take longer to transmit
on the CAN bus than it takes to process
them this flag is unlikely to occur. If it ever
occurs, the likely cause is very heavy I2C
traffic combined with a large number of
ADIO boards which add considerable
CAN traffic to the bus.
Reset the device. If the problem per‐
sists, the I2C traffic to the CAN bridge
or the number of ADIO boards in the
system must be reduced.
4268 ? CAN: Transmit Buffer Over‐
flow
There are too many pending CAN mes‐
sages and the transmit buffer is full. This
indicates that the SYSCON is performing
I/O operations faster than they can be
transmitted on the CAN bus. The most
likely cause would be heavy DO traffic
since the I2C protocol can update many
DO bits per transaction but it takes one
CAN message for EACH DO bit.
Contact Customer Support.
4269 ? CAN: Channel not respond‐
ing
Indicates that one or more channels have
not properly communicated and recovery
efforts have failed. For outputs, this flag
is set after several retries writing to a
channel without proper confirmation from
the CAN card that the message was re‐
ceived and handled. For inputs, this flag
is set after enough time passes without
getting an update from the channel.
Reset the device. If the problem per‐
sists, replace the CAN card.
4270 ? CAN: Hardware FIFO
Overflow
The PICs hardware CAN message buffer
has overflowed.
Contact Customer Support.
4297 + CAN: init complete The initialization of the CAN card has
completed. Informational message.
No action necessary.
General Maintenance and Troubleshooting
4.6 Alarm Codes, Descriptions, and Suggested Actions
Maxum edition II Analyzer General Maintenance
78 Manual, August 2018, A5E42019842001
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