Siemens SIMATIC ET 200pro Original Instructions Manual page 206

Alarms, faults and system messages
11.4 Alarms
The converter uses an internal time calculation to save the alarm times. More information on
the internal time calculation can be found in Chapter List of alarms and faults (Page 212).
As soon as the alarm has been removed, the converter writes the associated instant in time
into parameters r2125 and r2146. The alarm remains in the alarm buffer even if the alarm
has been removed.
If an additional alarm is received, then this is also saved. The first alarm is still saved. The
alarms that have occurred are counted in p2111.
Figure 11-3
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.
Figure 11-4
Emptying the alarm buffer: Alarm history
The alarm history traces up to 56 alarms.
206
Saving the second alarm in the alarm buffer
Complete alarm buffer
SIMATIC ET 200pro FC-2 converter
Operating Instructions, 04/2015, FW V4.7.3, A5E34257324B AB