During CNC machine operation, alarms may occasionally occur. To address these issues effectively, targeted troubleshooting and maintenance are required. This article provides a classification of common FANUC system alarms for reference, helping technicians respond correctly when problems arise.
FANUC Alarm Classification
FANUC system alarms refer to faults detected in CNC hardware or software. Alarms are classified according to their numbers as follows:
| Alarm Number Range | Category |
|---|---|
|
000~ |
Programming & Operation |
|
300~ |
Pulse Encoder |
|
400~ |
Servo |
|
500~ |
Overtravel |
|
700~ |
Overheat / Temperature Exception |
|
749~ |
Spindle Communication |
|
900~ |
CNC System |
|
5000~ |
Programming & Operation |
|
9000~ |
Spindle |
Examples:
- SV0409: Torque detection abnormal
- SV5136: FSSB amplifier shortage
- OH0701: Fan motor stopped
- SP9004: SSPA:04 Power phase loss / Fuse blown
Alarm Prefix Classification
| Alarm Prefixes | Types |
|---|---|
|
PSxxxx |
Program Operation Related |
|
BGxxxx |
Background Editing Related |
|
SRxxxx |
Communication Related |
|
SWxxxx |
Parameter Write Status |
|
SVxxxx |
Servo Related |
|
OTxxxx |
Overtravel Related |
|
IOxxxx |
Memory File Related |
|
PWxxxx |
Power Cut Request |
|
SPxxxx |
Spindle Related |
|
OHxxxx |
Overheat Related |
|
DSxxxx |
Other |
|
IExxxx |
Malfunction Prevention |
External Alarms
External alarms are defined by machine manufacturers based on external auxiliary equipment actions. They are output through PMC programs:
| Information Number Range | Number Range | Type Description |
|---|---|---|
|
1000~1999 |
Alarm Info Page Shows |
alarm info; CNC enters alarm state |
|
2000~2099 |
Operation Info Page Shows |
Operation Info |
|
2100~2999 |
Operation Info Page Shows |
Operation Info(no information number) Only displays content, no number |
Examples:
- EX1100: EMERGENCY
- EX1101: OVERLOAD THERMAL OR TRIP
- SLIDE OIL LEVEL LOW
- COUNTER COUNT UP
Note:
External alarms are manufacturer-defined and vary by model. Please refer to the machine manual for details.
Other Articles
Related Articles
Here are some related technical resources you may also find helpful:
- Fanuc Common Over Travel Alarm List
- FANUC G/ M Code for a Machining Center
- FANUC G/ M Code for lathe
- How to backup SRAM file
- How to backup All data
- How to Solve FANUC alarm 5523/5524
Technical Categories
Browse our full set of technical resources:
-
Common FANUC Alarms
-
G & M Code Reference
-
Technical Guides (Backup, Parameters, Settings)
- Repair Cases & Troubleshooting Examples
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