Advantech ADAM-5510/P31 Manual page 120

(6) When the utility completes re-writing the kernel program to the
ADAM-5510/P31, you can restart your work.
While the ADAM-5510/P31 system is in operation, the indicators on
the front panel can help you diagnose problems with the system. The
table below gives a quick reference of the ADAM-5510/P31's status
associated with each status indicator.