Siemens SIMATIC ET 200pro - Page 207

Alarms, faults and system messages
11.4 Alarms
SIMATIC ET 200pro FC-2 converter
Operating Instructions, 04/2015, FW V4.7.3, A5E34257324B AB
207
The alarm history only takes alarms that have been removed from the alarm buffer. If the
alarm buffer is completely filled - and an additional alarm occurs - then the converter shifts all
alarms that have been removed from the alarm buffer into the alarm history. In the alarm
history, alarms are also sorted according to the "alarm time received", however, when
compared to the alarm buffer, in the inverse sequence:
● The youngest alarm is in index 8
● The second youngest alarm is in index 9
● etc.
Figure 11-5 Shifting alarms that have been removed into the alarm history
Any alarms that have not been removed remain in the alarm buffer. The converter sorts the
alarms and closes gaps between the alarms.
If the alarm history is filled up to index 63, each time a new alarm is accepted in the alarm
history, the oldest alarm is deleted.
Parameters of the alarm buffer and the alarm history
Parameter
Description
r2122
Alarm code
Displays the numbers of alarms that have occurred
r2123
Alarm time received in milliseconds
Displays the time in milliseconds when the alarm occurred
r2124
Alarm value
Displays additional information about the alarm
r2125
Alarm time removed in milliseconds
Displays the time in milliseconds when the alarm was removed