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My milling machine equiped with fanuc 15m system,It doesn't boot up , there is 4 segment red led display on Base-0 board the led-1 in this board lights up as soon as machine starts and stays unchanged. In the manual the error message is fault in F-Bus or fault in one of modules on board. I have changed the modules and Base-0 too but no result the led-1 is still on . Can anybody give advise or instruct how to find the failure?
Thanks in advance