16/18/21

A bus error occurred on the local bus. The motherboard may be faulty.

A bus error occurred on the motherboard. The motherboard may be faulty.

A bus error occurred on the FANUC bus. The motherboard or option board may be faulty.

An NMI occurred as a result of an unknown cause.

An NMI occurred on a board other than the motherboard. The option board may be faulty.

An alarm condition occurred in the interface with an I/O unit. For PMC-
RA1, PMC-RA2, and PMC-RB, check that the PMC control module on
the main CPU board is conneted to the I/O unit securely. For PMC-RC,
check that the PMC control module on the option 3 board is connected
to the I/O unit is supplied with power and that the interface module is intact.

RAM parity error or NMI occurred in the PMC-RB module.
The main CPU board is faulty.

An error occurred in the PMC. (Watchdog alarm) The motherboard may be faulty.

An error occurred in the PMC. The PMC control circuit on the motherboard may be faulty.

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.