Siemens Sinamics CU240D-2 DP Operating Instructions Manual page 272

Alarms, faults and system messages
8.4 Alarms, alarm buffer, and alarm history
Alarm history
Figure 8-3
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.
3. The inverter closes gaps in the alarm buffer that occurred when the removed alarms were
shifted in the alarm history by shifting the alarms that have not been removed "up".
4. The inverter saves the received alarm as the latest alarm in the alarm buffer.
The alarm history saves up to 56 alarms.
In the alarm history, alarms are sorted according to the "alarm time received". The latest
alarm has Index [8].
Parameters of the alarm buffer and the alarm history
Parameter
p2111
r2122
270
Shifting removed alarms into the alarm history
Description
Alarm counter
Number of alarms that have occurred after the last reset
When setting p2111 = 0, all of the alarms that have been removed from the alarm
buffer [0...7] are transferred into the alarm history [8...63]
Alarm code
Displays the numbers of the alarms that have occurred
Converter with the control units CU240D-2
Operating Instructions, 04/2018, FW V4.9 SP10, A5E34262100B AF