
APPENDIX
B–63505EN/02
A. ALARM LIST
317
(These alarms cannot be reset with reset key.)
Number Message Contents
900 ROM PARITY F–ROM parity error in a ROM file (control software), such as CNC,
macro, or digital servo. The F–ROM module may be defective.
910 DRAM PARITY : (Low) DRAM parity error
911 DRAM PARITY: (High)
The main board may be defective.
912 SRAM PARITY: (Low) For an SRAM parity error, initialize the memory. If the error subse-
quently recurs, or in the case of a DRAM parity error, replace the
913 SRAM PARITY : (High)
quently recurs, or in the case of a DRAM parity error, replace the
FROM and SRAM modules or memory or spindle modules.
Subsequently, set the parameters and all other data again.
920 SERVO ALARM (1/2 AXIS) Servo alarm (1st or 2nd axis). A watchdog alarm or a RAM parity
error in the servo module occurred.
Replace the servo control module on the main CPU board.
921 SERVO ALARM (3/4 AXIS) Servo alarm (3rd or 4th axis). A watchdog alarm or a RAM parity
error in the servo module occurred.
Replace the servo control module on the main CPU board.
924 SERVO MODULE SETTING
ERROR
The digital servo module is not installed.
Check that the servo control module on the main board is mounted
securely.
930 CPU INTERRUPUT CPU error (abnormal interrupt)
The main board is faulty.
940 PCB ERROR PCB ID error. The main board or the memory module may be
defective.
950 PMC SYSTEM ALARM Fault occurred in the PMC. The PMC control module on the main
board or the RAM module may be defective.
960 DC24V POWER OFF The abnormal 24VDC input power may be defective.
971 NMI OCCURRED IN SLC An alarm condition occurred in the interface with an I/O unit.
Check the connection between the PMC control module on the main
board and the I/O Unit. Also, check that the power of the I/O Unit is
on and that the interface module is operating normally.
973 NON MASK INTERRUPT NMI occurred for an unknown reason.
The printed board of the power unit or the main board may be defec-
tive. Or, there may be noise interference.
974 BUS ERROR Bus error
The main board may be defective.
(10) System alarms