Fanuc 16 and 18 Alarms and Error Codes

Fanuc 16 and 18 Alarms.

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These alarm codes relate to Model A , B & C.

(b) denotes model B additional alarms / (c) donotes model C additional alarms.

PMC Alarms

Alarm Code	Description of Alarm/Fault
ALARM NOTHING	Normal Status
ER00 PROGRAM DATA ERROR (ROM)	The sequence program in the ROM is not written correctly.
ER01 PROGRAM DATA ERROR (RAM)	The sequence program in the debugging RAM is defective
ER02 PROGRAM SIZE OVER	The size of sequence program exceeds the maximum size of LADDER (PMC-RC only)
ER03 PROGRAM SIZE ERROR (OPTION)	The size of sequence program exceeds the option specification size.
ER04 PMC TYPE UNMATCH	The PMC model setting of the sequence program is not corresponding to an actual model.
ER05 PMC MODULE TYPE ERROR	The module type of the PMC engine is not correct.
ER06 PROGRAM MODULE NOTHING	Both ROM for sequence program and the debugging RAM do not exist (PMC-RC only).
ER07 NO OPTION (LADDER STEP)	There is no step number option of LADDER.
ER 16 RAM CHECK ERROR (PROGRAM RAM)	The debugging RAM cannot be read/written normally.
ER17 PROGRAM PARITY	The parity error occured on the ROM for sequence program or the debugging RAM.
ER18 PROGRAM DATA ERROR BY I/O	Transferring the sequence program from offline programmer was interrupted by the power off etc.
ER19 LADDER DATA ERROR	Editing the LADDER was interrupted by the power off or by the switch to the CNC screen by the function key etc.

Background Edit Alarm

Alarm Code	Type	Description of Alarm/Fault
????	BP/S alarm	BP/S alarm occurs in the same number as the P/S alarm that occurs in ordinary program edit. ( 070, 071, 072, 073, 074, 085, 086, 087 etc)
140	BP/S alarm	It was attempted to select or delete in the background of a program being selected in the foreground ( Note: Use background editing correctly)

Note: Alarm in background is displayed in the key input line of the background edit screen instead of the ordinary alarm screen and is resettable by any of the MDI key operation.

Absolute Pulse Coder (APC) Alarm

Alarm Code	Type	Description of Alarm/Fault
300	nth-axis origin return	Manual reference position return is required for the nth axis (n=1-8)
301	APM alarm: nth axis communication	nth axis (n=1-8) APC communications error. Failure in data transmission.
302	APM alarm: nth axis over time	nth axis (n=1-8) APC overtime error. Failure in data transmission.
303	APM alarm: nth axis framing	nth axis (n=1-8) APC framing error. Failure in data transmission.
304	APM alarm: nth axis parity	nth axis (n=1-8) APC parity error. Failure in data transmission.
305	APM alarm: nth axis pulse error	nth axis (n=1-8) APC pulse error alarm. APC alarm.
306	APM alarm: nth axis battery voltage 0	nth axis (n=1-8) APC battery voltage has decreased to a low level so that the data cannot be held.
307	APM alarm: nth axis battery low 1	nth axis (n=1-8) APC battery voltage reaches a level where the battery must be renewed.
308	APM alarm: ntha xis battery low 2	nth axis (n=1-8) APC battery voltage has reached a level where the battery must be renewed. (including when the power is off).
309 (b) (c)	APC Alarm: n AXIS ZRN IMPOSSIBL	Return to the origin has been attempted without first rotating the motor one of more times. Before returning to the origin, rotate the motor one or more times then turn off the power.

Serial Pulse Coder (SPC) alarms

Alarm Code	Type	Description of Alarm/Fault
350	SPC ALARM: n AXIS PULSE CODER	The n axis ( axis 1-8) pulse coder has a fault.
351	SPC ALARM: n AXIS COMMUNICATION	n axis ( axis 1-8) serial pulse coder communciation error ( data transmission fault).

Servo Alarms

Alarm Code	Type	Description of Alarm/Fault
400	SERVO ALARM: n-TH AXIS OVERLOAD	The n-th axis (axis 1-8) overload signal is on.
401	SERVO ALARM: n-TH AXIS VRDY	The n-th xis (axis 1-8) servo amplifier READY signal (DRDY) went off.
404	SERVO ALARM: n-TH VRDY ON	Even though the n-th axis ( axis 1-8) READY signal (MCON) went off the servo amplifier READY signal (DRDY) is still on. Or when the power was turned on, DRDY went on even though MCON was off.
405	SERVO ALARM: ZERO POINT RETURN FAULT	Position control system fault. Due to an NC or servo system fault in the reference position return, there is the possiblity that the reference position return could not be executed correctly.
407	SERVO ALARM: EXCESS ERROR	The difference in synchronous axis position deviation exceeded the set value.
409 (b) (c)	SERVO ALARM: n AXIS TORQUE ALARM	Abnormal servo motor load has been detected. Alternatively, abnormal spindle motor load has been detected in Cs mode.
410	SERVO ALARM: n-TH AXIS EXCESS ERROR	The position deviation value when the n-th axis( axis 1-8) stops is larger than the set value.
411	SERVO ALARM: n-TH AXIS EXCESS ERROR	The position deviation value when the n-th axis( axis 1-8) moves is larger than the set value.
413	SERVO ALARM: n-TH AXIS LSI OVERFLOW	The contents of the error register for the n-th axis ( axis 1-8) exceeded + or -2 31 power. This error usually occurs due to the result of incorrectly set parameters.
414	SERVO ALARM: n-TH AXIS DETECTION RELATED ERROR	N-th axis ( axis 1-8) digital servo system fault.
415	SERVO ALARM: n-TH AXIS EXCESS SHIFT	A speed higher than 511875 units/s was attempted to be set in the n-th axis ( axis 1-8). This error occurs as the result of an improperly set CMR.
416	SERVO ALARM: n-TH AXIS DISCONNECTION	Position detection system fault in the n-th axis ( axis 1-8) pulse coder ( disconnection alarm).
417	SERVO ALARM: n-TH AXIS PARAMETER INCORRECT	This alarm occurs when the n-th axis ( axis 1-8) is in one of the conditions listed below ( Digital servo system alarm). The value set in Parameter No 2020 (motor form) is out of the specified limit. A proper value ( 111 0r -111) is not set in parameter No 2022 (motor revolution direction). Illegal data ( a value below 0, etc) was set in parameter N0.2023 ( number of speed feedback pulses per motor revolution). Illegal data ( a value below 0, etc) was set in parameter No.2024 ( number of position feedback pulses per motor revolution). Parameters No. 2084 and No.2085 ( flexible field gear rate) have not been set. A value outside the limit of {1 to the number of control axes} or a non continuous value ( Parameter 1023 ( servo axis number) contains a value out of the range from 1 to the number of axes, or an isolated value ( for example, 4 not preceeded by 3), was set in parameter No. 1023 ( servo axis number).
420 (b) (c)	SERVO ALARM: n AXIS SYNC TORQUE (M Series)	During simple synchronous control, the difference between the torque commands for the master and slave axes exceded the value set in parameter No 2031.
421 (b) (c)	SERVO ALARM: n AXIS EXCESSER (D)	The difference between the errors in the semi closed loop and closed loop has become excessive during dual positon feedback.

Over Travel Alarms

Alarm Code	Type	Description of Alarm/Fault
500	OVER TRAVEL: +n	Exceeded the n-th axis ( axis 1-8) + side stored stroke limit I.
501	OVER TRAVEL: -n	Exceeded the n-th axis ( axis 1-8) – side stored stroke limit I.
502	OVER TRAVEL: +n	Exceeded the n-th axis ( axis 1-8) + side stored stroke limit II.
503	OVER TRAVEL : -n	Exceeded the n-th axis ( axis 1-8) – side stored stroke limit II.
504	OVER TRAVEL: +n	Exceeded the n-th axis ( axis 1-8) + side stored stroke limit III.
505	OVER TRAVEL: -n	Exceeded the n-th axis ( axis 1-8) – side stored stroke limit III.
506	OVER TRAVEL: +n	Exceeded the n-th axis ( axis 1-8) + side hardware OT.
507	OVER TRAVEL: -n	Exceeded the n-th axis ( axis 1-8) – side hardware OT.
508	INTERFERENCE : +n	A tool moving in the positive direction along the n axis has fouled another tool post.
509	INTERFERENCE: -n	A tool moving in the negative direction along the n axis has fouled another tool post.
510	OVER TRAVEL: +n	Alarm for stroke check prior to movement. The end point specified in a block falls within the forbidden area defined with the stroke limit in the positive direction along the N axis. Correct the program.
511	OVER TRAVEL: -n	Alarm for stroke check prior to movement. The end point specified in a block falls within the forbidden area defined with the stroke limit in the negative direction along the N axis. Correct the program.

Overheat Alarms

Alarm Code	Type	Description of Alarm/Fault
700	OVERHEAT: CONTROL UNIT	Control unit overheat
701	OVERHEAT: FAN MOTOR	The fan motor on top of the cabinet for the control unit is overheated.
704	OVERHEAT: SPINDLE	Spindle overheat in the spindle fluctuation detection.

Rigid Tapping Alarms

740	RIGID TAP ALARM: EXCESS ERROR	The positional deviation of the stopped spindle has exceeded the set value during rigid tapping.
741	RIGID TAP ALARM: EXCESS ERROR	The positional deviation of the stopped spindle has exceeded the set value during rigid tapping.
742	RIGID TAP ALARM: LSI OVERFLOW	An LSI overflow has occured for the spindle during rigid tapping.

Serial Spindle Alarms

Alarm Code	Type	Description of Alarm/Fault
749	S-SPINDLE LSI ERROR	It is serial communication error while system is executing after power supply on.
750	SPINDLE SERIAL LINK START FAULT	This alarm is generated when the spindle control unit is not ready for starting correctly when the power is turned on in the system with the serial spindle.
751	FIRST SPINDLE ALARM DETECTION ( AL-XXX)	This alarm indicates in the NC that an alarm is generated in the spindle unit of the system with serial spindle. The alarm is displayed in form AL-XX ( XX is a number).
752	FIRST SPINDLE MODE CHANGE	This alarm is generated if the system does not properly terminate a mode change.
754	SPINDLE 1 ABNORMAL TORQUE ALARM	Abnormal first spindle motor load has been detected.
761	SECOND SPINDLE ALARM DETECTION (AL-XXX)	Refer to alarm No 751
762	SECOND SPINDLE MODE CHANGE FAULT	Refer to alarm No 752
764	SPINDLE-2 ABNORMAL TORQUE ALARM	Same as alarm No 754
771	SPINDLE-3 ALARM DETECT (AL-XXX)	Same as alarm No 751
772	SPINDLE- 3 MODE CHANGE ERROR	Same as alarm No 752
774	SPINDLE 3- ABNORMAL TORQUE ALARM	Same as alarm No 754

System Alarms ( These alarms cannot be reset with a reset key)

Alarm Code	Type	Description of Alarm/Fault
900	ROM PARITY	ROM parity error (CNC/OMM/Servo). Replace the number of ROM.
910	ROM PARITY : (4N)	RAM parity error in the tape memory RAM module. After this operation reset all the data including the parameters.
911	ROM PARITY : (4N+1)	RAM parity error in the tape memory RAM module.After this operation reset all the data including the parameters.
912	ROM PARITY : (4N+2)	RAM parity error in the tape memory RAM module. After this operation reset all the data including the parameters.
913	ROM PARITY : (4N+3)	RAM parity error in the tape memory RAM module. After this operation reset all the data including the parameters.
914 (b) (c)	SRAM PARITY: (2N)	A RAM parity error occured in RAM for part program storage or additional SRAM. Clear the memory, or replace the main CPU board or additional SRAM. Then set all data including parameters again.
915 (b) (c)	SRAM PARITY: (2+1)	A RAM parity error occured in RAM for part program storage or additional SRAM. Clear the memory, or replace the main CPU board or additional SRAM. Then set all data including parameters again.
916 (b) (c)	DRAM PARITY	RAM parity error in DRAM module. Replace the DRAM module.
920	SERVO ALARM (1/2 AXIS)	Servo alarm (3rd or 4th axis). A wathdog alarm or RAM parity error in the servo module occured. Replace the servo control module on the main CPU board.
920 (b)	SERVO ALARM (1/2/3/4 AXIS)	Servo alarm (1st to 4th axis). A wathdog alarm or RAM parity error in the servo module occured.
920 (c)	SERVO ALARM (MAIN)	Servo alarm (main CPU board). A watchdog alarm or a RAM parity error in the servo module occured. 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 occured. Replace the servo control module on the main CPU board.
922	SERVO ALARM (5/6 AXIS)	Servo alarm (5th or 6th axis). A watchdog alarm or a RAM parity error in the servo module occured. Replace the servo control module on the option 2 board.
922 (b)	SERVO ALARM (5/6/7/8 AXIS)	Servo alarm (5th to 8th axis). A watchdog aalrm or a RAM parity error in the servo module occured.
922 (c)	SERVO ALARM (OPT2)	Servo alarm (option 2 board). A watchdog alarm or a RAM parity error in the servo module occured. Replace the servo control module on the option 2 board.
923	SERVO ALARM (7/8 AXIS)	Servo alarm (7th or 8th axis). A watchdog alarm or a RAM parity error in the servo module occured. Replace the servo control module on the option 2 board.
924	SERVO MODULE SETTING ERROR	The digital servo module is not installed. Check that the serbo module or servo interface module on the main CPU or option 2 board is mounted securely.
926 (b)	SERVO ALARM (1/2/3/4/5/6/ AXIS)	Servo alarm ( 1st to 6th axis). A watchdog alarm was issued, or a RAM parity error occured in the servo module.
930	CPU INTERRUPT	CPU error ( abnormal interrupt). The main CPC board is faulty.
945	SERIAL SPINDLE COMMUNICATION ERROR	Communications error occured in the serial spindle. The optical fiber maybe be disconnected.
950	PMC SYSTEM ALARM	Fault occured in the PMC. The PMC control module on the main CPU board or option 3 board may be faulty.
951	PMC-RT WATCH DOG ALARM	Fault occured in the PMC-RC ( watchdog alarm). Option 3 board may be faulty.
970	NMI OCCURED IN BOC	RAM parity error or NMI occured in the RMC-RB or PMC-RA2 module.
971	NMI OCCURED IN SLC	An alarm condition occured 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 connected 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.
972	NMI OCCURED IN OTHER MODULE	NMI occured in a board other than the main CPU board.
973	NON MASK INTERRUPT	NMI occured for an unknown reason.
974 (b) (c)	F-BUS ERROR	FANUC BUS is error.
975 (b) (c)	BUS ERROR (MAIN)	MAIN CPU board is BUS error.