Issue
Will I lose my alarms log in Vijeo Designer when power cycling my Harmony HMI?

Product Line
Vijeo Designer, XBTGT, XBTGK, HMIGTO, HMIGK, HMIG2U, HMIG3U

Environment
HMI Programming Software for Windows and Physical HMI

Resolution
Each alarm group can have 2 types of alarm buffers:
(1) one for History Alarm events (size defined by the "Num of History Alarms" property) and
(2) one for Log Alarm events (size defined by the "Num of Log Alarms" property).

These alarm buffers are stored by default in the DRAM (Dynamic RAM: similar to the RAM of a PC) of the HMI Target. Therefore, if the target is turned off, the alarm buffers will be cleared from the memory.

If you need them to be saved even when the HMI power is turned off, you can activate 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 activate the "Save To File" property (at the alarm group level). This way, the alarm events will be saved into Excel CSV files (on the CF card) and these Excel files will contain the whole history of alarm events for the corresponding alarm groups.