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FANUC Controller
Program/G-code · Basic · 10-20 minutes
Fanuc Alarm 319 - END POINT COMMAND ILLEGAL IN DRILLING CYCLE
Fanuc Alarm 319 occurs when a G74 (peck drilling cycle for facing) or G75 (outer diameter/inner diameter grooving cycle) is programmed with a zero travel distance (depth per cut) but specifies a non-zero endpoint value in U or W. This creates a logical conflict where the cycle has an endpoint to reach but no incremental movement per cycle to get there.
319
Fanuc Alarm 319 - END POINT COMMAND ILLEGAL IN DRILLING CYCLE
SYSTEM ALARM 319
Fanuc alarm 319: SYSTEM ALARM 319. This alarm indicates a fault condition detected by the Fanuc control. Refer to the alarm number and name to identify the specific system or function involved.
Root Cause Summary
Fanuc Alarm 319 occurs when a G74 (peck drilling cycle for facing) or G75 (outer diameter/inner diameter grooving cycle) is programmed with a zero travel distance (depth per cut) but specifies a non-zero endpoint value in U or W. This creates a logical conflict where the cycle has an endpoint to reach but no incremental movement per cycle to get there.
Causes and Fixes
- 1
Review the G74 or G75 block in the active program. For G74, verify format G74 R(retract) G74 X(or Z) I(depth increment) K(depth increment) U(endpoint) W(endpoint). For G75, verify similar syntax with appropriate axis assignments per your Fanuc lathe configuration.
- 2
Check if the first I or K value (depth per cut) is programmed as zero or omitted while U or W has a non-zero value. Example of incorrect code: G74 R1.0; G74 Z-50. I0 K10. U-20.; where I0 creates the alarm.
- 3
Correct the program by specifying a non-zero incremental depth value (I or K) that matches the axis of motion, or remove the U/W endpoint command if no endpoint offset is intended. Example correction: G74 Z-50. I5. K10. U-20.; with I5 providing proper peck depth.
- 4
Execute a program check (PROGRAM > EDIT mode, then press RESET and search for G74/G75 cycles) to verify all drilling/grooving cycles have proper incremental and endpoint values before running in AUTO mode.
Call a technician if:
- ·Custom macro programs are involved
- ·Parameter modifications are suspected
- ·Alarm persists after program corrections
Prevention
- Always use G80 to cancel drilling cycles before starting new ones
- Avoid mixing zero travel distances with non-zero endpoint coordinates
- Use program simulation to verify drilling cycle parameters before execution
Common Mistakes
- Programming U/W values when only simple drilling is needed
- Not clearing modal values between different drilling operations
- Misunderstanding I/K travel distance vs U/W endpoint relationship
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