Siemens sinamics G120 Operating Instructions Manual page 409
Low voltage inverters chassis devices with cu250s-2 control units and encoder evaluation
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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.
Image 9-3
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. In the alarm
history, alarms are also sorted according to the "alarm time received", however, when
compared to the alarm buffer, in the inverse sequence:
● The youngest alarm is in index 8
● The second youngest alarm is in index 9
● etc.
Image 9-4
Converter with CU250S-2 Control Unit
Operating Instructions, 01/2016, FW V4.7 SP6, A5E31759476B AE
Complete alarm buffer
Shifting alarms that have been removed into the alarm history
Alarms, faults and system messages
9.3 Alarms
409
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