What causes FANUC alarm 314?

Parameter No. 7610 has an invalid or undefined tool rotation axis number assigned for polygon turning. The axis specified for polygon turning conflicts with an existing spindle or axis configuration in the system. Polygon turning sync ratio or axis pairing is incorrectly set, causing a mismatch between spindle and tool rotation axis. The G51.2 command in the program references an axis that does not exist or is not configured for polygon use. Required option for polygon turning is not enabled, causing any axis assignment to be rejected as invalid.

How do I fix FANUC alarm 314?

1. Check parameter No. 7610 and verify the tool rotation axis number matches an actual configured axis on the machine. The value must correspond to a valid axis number, not zero or an out-of-range value. 2. Review the G51.2 block in the part program and confirm the axis address and sync ratio values are correctly formatted and within allowed limits for your control version. 3. Verify that the polygon turning option is properly enabled on the control. Contact your Fanuc dealer if the option bit is not set, as this alarm can trigger when the feature is unlocked incorrectly. 4. Cross-check all spindle-related parameters (No. 3716, 3717) to ensure the spindle used for polygon sync is not also assigned as a feed axis, which causes a conflict. 5. After correcting any parameter values, perform a power cycle and re-run the program from the beginning to confirm the alarm clears before resuming production.

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FANUC Controller

Spindle · Advanced · 30-60 minutes

Alarm 314

Fanuc Alarm 314 - ILLEGAL SETTING OF POLYGONAL AXIS

Alarm 314 occurs during polygon turning operations when the rotary tool axis specification conflicts with the configured parameters or when the polygon axis setup is incompatible with the active spindle configuration. This is typically caused by incorrect parameter 7610 (tool rotation axis designation), mismatch between programmed axis and parameter settings, or attempting polygon turning without proper C-axis or rotary tool configuration.

FANUCSpindleAdvanced30-60 minutes

314

Fanuc Alarm 314 - ILLEGAL SETTING OF POLYGONAL AXIS

SPINDLE ALARM 314

Root Cause Summary

Alarm 314 occurs during polygon turning operations when the rotary tool axis specification conflicts with the configured parameters or when the polygon axis setup is incompatible with the active spindle configuration. This is typically caused by incorrect parameter 7610 (tool rotation axis designation), mismatch between programmed axis and parameter settings, or attempting polygon turning without proper C-axis or rotary tool configuration.

Causes and Fixes

1
Navigate to SYSTEM > PARAM and search for parameter 7610. Verify the tool rotation axis is correctly specified (typically C-axis for main spindle or C2 for sub-spindle).
2
Cross-reference parameter 7610 setting with parameter 1020 (axis name assignment) to confirm the specified axis actually exists in your machine configuration.
3
Verify parameter 5440#0 (C-axis control enable) is set to 1 if using C-axis for polygon turning. For rotary tool configurations, confirm parameter 5431 (rotary axis number) matches the axis in 7610.
4
After correcting parameter 7610, power cycle the control (full power OFF/ON) to ensure parameter changes take effect, then retest polygon turning operation with G51.2.
Parameter write enable (PWE) must be active. Set parameter 3202#0=1 temporarily or use key switch.

DIY Feasiblehigh confidence

Call a technician if:

·Parameter changes don't resolve alarm
·Software options are missing
·Mechanical axis configuration issues

Prevention

Always verify axis configuration before programming polygon turning
Document parameter 7610 settings for each machine
Test polygon turning setup with simple programs first

Common Mistakes

Setting parameter 7610 to linear axis instead of rotary axis
Forgetting to power cycle after parameter changes
Using G51.2 without verifying axis availability

Related Alarms

313 315 320 321

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