Alarm Button -PSU

Hi CEMS,
Hope you are doing good.
Please be informed that different hardware models have different Front Panel and LED status information and also for most of the devices  Power and Alarm LED have different functioning. 
Kindly check the below link for LED status information on the box
https://docs.fortinet.com/document/fortigate/7.6.0/administration-guide/997251/leds


Regards,
Parteek

Yes I got it alarm button is related to major and minor alarm However wehn I plugged out one of my psu ,there is no alarm  in alarm button in front of firewall.Therefoe Is there any configuration for settings missing psu for minor or major alarms ?