[Need help!] Fanuc Amada vega 345 can not startup

Hi all,

When i power on.
Board AI6B-1600-00 on UNIT INPUT switch ON contactor about 3s.
Then switch OFF contactor.

I checked I/O port on board AI6B-1600-00 .
It connect with AI6B-1210-0660 by CP2.
Pin 5 and pin 6 of CP2 connect common open relay RY11 ( on AI6B-1210-0660 )
Board AI6B-1600-00 switch off contactor because RY11 does not work.

But i do not understand.
Can you help me ?

Thanks,