Siemens Sinamics s120 Commissioning Manual page 370

Diagnostics
4.5 Fault and alarm messages
Alarm buffer, alarm history
An alarm in the alarm buffer comprises the alarm code, the alarm value and the alarm time
(received, resolved). The alarm history occupies the last indices ([8...63]) of the parameter.
Image 4-15 Structure of alarm buffer
Alarms that occur are entered in the alarm buffer as follows:
A maximum of 64 alarms are displayed in the alarm buffer:
● Index 0 ... 6: The first 7 alarms are displayed.
● Index 7: The most recent alarm is displayed.
A maximum of 56 alarms are displayed in the alarm history:
● Index 8: The most recent alarm is displayed.
● Index 9 .. 63: The first 55 alarms are displayed.
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STARTER Commissioning Manual
Commissioning Manual, (IH1), 07/2016, 6SL3097-4AF00-0BP5