Siemens SIMATIC ET 200pro Series Operating Instructions Manual page 223

The inverter saves incoming alarms in the alarm buffer. An alarm includes an alarm code, an
alarm value, and two alarm times:
● Alarm code: r2122
● Alarm value: r2124 in fixed-point format "I32", r2134 in floating-point format "Float"
● Alarm time received = r2145 + r2123
● Alarm time removed = r2146 + r2125
The inverter takes its internal time calculation to save the alarm times.
Up to 8 alarms can be saved in the alarm buffer.
In the alarm buffer, the warnings are sorted according to "Warning time received". If the
alarm buffer is completely filled and an additional alarm occurs, then the inverter overwrites
the values with Index [7].
Alarm history
Figure 10-3
If the alarm buffer is completely filled and an additional alarm occurs, the inverter shifts all
removed alarms into the alarm history. The following occurs in detail:
1. To create space after position [8] in the alarm history, the inverter shifts the alarms
already stored in the alarm history "down" by one or more positions.
If the alarm history is completely full, the inverter will delete the oldest alarms.
2. The inverter moves the removed alarms from the alarm buffer to the now freed up
positions of the alarm history.
Alarms that have not been removed remain in the alarm buffer.
SIMATIC ET 200pro FC-2 converter
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34257324B AE
List of alarms and faults (Page 228)
Shifting removed alarms into the alarm history
Alarms, faults and system messages
10.4 Alarms, alarm buffer, and alarm history
223