Fanuc

Communication is impossible with the second serial spindle. Ensure
that the second serial spindle is connected securely.

Communications error occured in the serial spindle.The optical fiber may be disconnected. The hardware configuration is incorrect for the serial spindle, or a communication alarm occurred. Check the hardware configuration of
the spindle. Also ensure that the hardware for the serial spindle is
connected securely.

An error occurred in RAM for part program storage. Action: Replace the master printed circuit board (SRAM module), perform all-clear operation, and set all parameter and other data again.

The memory PC board is not connected securely. Ensure that the
PC board is connected securely.

PC board installation is incorrect. Check the specification of the PC
board.

CPU error (abnormal interrupt). The motherboard or CPU card may be faulty.

FSSB alarm. Replace the axis control card.

The digital servo module is not installed.
Check that the servo control module or servo interface module on the
main CPU or option 2 board is mounted securely.

Servo alarm (5th to 8th axis). A watchdog alarm or a RAM parity error
in the servo module occurred.
Replace the servo control module on the option 2 board.

Servo alarm (fifth to eighth axis). A watchdog alarm condition occurred, or a RAM parity error occurred in the axis control card. Replace the axis control card.