Rockwell Automation 1769-SM2 Compact I/O DSI/Modbus Communication Module - Manual (Page 158)

9-6 Troubleshooting
The module has an event queue to record significant events that occur in
the operation of the module. When such an event occurs, an entry is put
into the event queue. You can view the event queue using DriveExplorer
v3.01 (or higher) software.
Figure 9.2 DriveExplorer Event View/Clear Screen
The event queue can contain up to 32 entries. Eventually the event queue
will become full, since its contents are retained through module resets.
At that point, a new entry replaces the oldest entry. Only an event queue
clear operation or module power cycle will clear the event queue
contents.
Resetting the module to defaults has no effect on the event queue.
Many events in the event queue occur under normal operation. If you
encounter unexpected communications problems, the events may help
you or Allen-Bradley personnel troubleshoot the problem. The following
events may appear in the event queue:
Viewing and Clearing Events
Table 9.C Module Events
Code Event Description
Module Events
0 No Event Empty event queue entry.
1 Normal Startup The module successfully started up.
2 Manual Reset The module performed a self-reset.
3 Watchdog T/O
Flt The software watchdog detected a failure and reset the module.
4 App Updated The application firmware has been flash updated.
5 Boot Updated The boot firmware has been flash updated.
6 EEPROM Sum
Flt The EEPROM checksum/CRC is incorrect. The functionality of
the module will be limited. Default parameters must be loaded
to clear this condition.