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Each alarm group can have 2 such alarm buffers: one for History alarm events (size defined by the "Num of History Alarms" property) and one for Log alarm events (size defined by the "Num of Log Alarms" property).
These alarm buffers are stored in the DRAM (Dynamic RAM: similar to the RAM of a PC) of the target. Therefore, if the target is turned off, the alarm buffers are wiped out. If you need them to be saved even when the target is turned off, you can enable the "Backup Alarm Group" property (at the global alarm level). This way, these alarm buffers will be stored in the DRAM and in the SRAM (Static RAM: doesn t get wiped out when the target is turned off) as well.
Since the size of these alarm buffers is limited (the maximum value for the "Num of History Alarms" and "Num of Log Alarms" properties is 10000), they won t always contain the whole history of alarm events on the target. To obtain that behavior, you can enable the "Save To File" property (at the alarm group level). This way, the alarm events will be saved into Excel files (on the CF card) and these Excel files will contain the whole history of alarm events for the corresponding alarm groups.