Siemens Maxum II Manual page 78

General Maintenance and Troubleshooting
4.6 Alarm Codes, Descriptions, and Suggested Actions
# Text
4265 ? CAN: Receive Init Buffer
Overflow
4266 ? CAN: Receive Heartbeat
Buffer Overflow
4267 ? CAN: Receive I/O Buffer
Overflow
4268 ? CAN: Transmit Buffer Over‐
flow
4269 ? CAN: Channel not respond‐
ing
4270 ? CAN: Hardware FIFO
Overflow
4297 + CAN: init complete
78
Description
The CAN bus receive buffer that process‐
es messages from uninitialized CAN
cards has overflowed. Initialization will
likely fail.
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.
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.
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.
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.
The PICs hardware CAN message buffer
has overflowed.
The initialization of the CAN card has
completed. Informational message.
Action
Contact Customer Support.
Contact Customer Support.
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.
Contact Customer Support.
Reset the device. If the problem per‐
sists, replace the CAN card.
Contact Customer Support.
No action necessary.
Maxum edition II Analyzer General Maintenance
Manual, August 2018, A5E42019842001