Siemens SINAMICS G120 Operating Instructions Manual page 261

The alarm buffer can contain up to eight alarms. If an additional alarm is received after the
eighth alarm - and none of the last eight alarms have been removed - then the next to last
alarm is overwritten.
Figure 10-3
Emptying the alarm buffer: Alarm history
The alarm history traces up to 56 alarms.
The alarm history only takes alarms that have been removed from the alarm buffer. If the
alarm buffer is completely filled - and an additional alarm occurs - then the inverter shifts all
alarms that have been removed from the alarm buffer into the alarm history. The inverter
sorts the alarms in the alarm history in the inverse sequence to the alarm buffer.
● the youngest alarm is in index 8
● the second youngest alarm is in index 9
● etc.
SINAMICS G120C Inverter
Operating Instructions, 01/2011, FW 4.4, A5E02999804A AB
Complete alarm buffer
Figure 10-4 Shifting alarms that have been removed into the alarm history
Alarms, faults and system messages
10.2 Alarms
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