Siemens SINAMICS S120 Commissioning Manual page 290

Diagnostics
5.4 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.
Figure 5-10 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.
Properties of the alarm buffer/alarm history:
● The alarms in the alarm buffer are arranged from 7 to 0 according to the time that they
occurred. In the alarm history, this is from 8 to 63.
● If 8 alarms have been entered into the alarm buffer, and a new alarm is received, then the
alarms that have been resolved are transferred into the alarm history.
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Commissioning with Startdrive
Commissioning Manual, 12/2018, 6SL3097-5AA10-0BP0