# Text Description Action
3764 ? Timeout SCL on %4 SNECON PICs: An I2C message trans‐
action failed because the I2C clock was
stretched beyond the allowed timeout pe‐
riod specified in the configuration. A mod‐
ule may be malfunctioning.
Contact Customer Support.
3765 ? Timeout SDA on %4 SNECON PICs: An I2C message trans‐
action failed because the I2C data line
was held beyond the allowed timeout pe‐
riod specified in the configuration. A mod‐
ule may be malfunctioning.
Contact Customer Support.
3766 ? Bus Not Sync on %4 SNECON PICs: The master-mode oper‐
ation generated a start condition that was
not detected by the FPGA.
Reset the SNECON. Replace the SNE‐
CON.
3767 ? Timeout Buffer on %4 SNECON PICs: A master-mode mes‐
sage has not been processed within a
timeout period. This is a broad alarm with
multiple possible causes. The PIC will
discard the message and attempt to re‐
cover.
Contact Customer Support.
3768 ? Invalid Handle on %4 SNECON PICs: The received header
handle was not sequential. One or more
I2C messages were lost.
Reset the SNECON.
Replace the SNECON.
3769 ? High I2C traffic on %4 The amount of traffic on the I2C bus has
exceeded a configurable threshold. A
heavy traffic may delay the I/O activity
which ultimately can affect the operation
(accuracy, repeatability) of the analyzer.
Check the methods to ensure that the I/
O activity is distributed in time and not
all at the same exact cycle time (Detec‐
tor balance event, valve events, tem‐
perature and pressure setpoint, etc).
3797 + Invalid Checksum Slave on
%4
SNECON PICs: An unsolicited I2C mes‐
sage was received with a bad checksum.
The message was discarded and it is ex‐
pected that the master will retry the mes‐
sage. This is a communication error that
can be ignored if not frequent.
Reset the SNECON.
Replace the SNECON.
3798 + Invalid Message Slave on
%4
SNECON PICs: An unsolicited I2C mes‐
sage was received with an invalid mes‐
sage size, invalid opcode or invalid data.
The message was discarded. There may
be a firmware version conflict.
Reload the OS and APP software to all
SNECONs.
3799 ? Invalid Status Summary on
%4
SNECON PICs: A packet was received
by the PIC from the NS486 and the pack‐
et had an undefined bit set in the Sta‐
tus_summary field of the packet. The
packet was processed normally.
Reload the OS and APP software for
the SNECON.
Replace the SNECON.
3800 ? Module Not Ready on %4 SNECON PICs: An I2C message trans‐
action failed after the required number of
retries and the cause of the failure was a
series of consecutive message NACKs,
all with a 0 flag. This may happen if the
firmware of the peripheral module is not
responding properly.
Reload the OS and APP software for
the SNECON.
Replace the module being addressed.
Replace the SNECON.
General Maintenance and Troubleshooting
4.6 Alarm Codes, Descriptions, and Suggested Actions
Maxum edition II Analyzer General Maintenance
74 Manual, August 2018, A5E42019842001
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