What causes FANUC alarm 322?

The finishing shape profile in the subprogram moves in the wrong direction, crossing back over the G71/G72 cycle start point. The Z or X coordinate in the first move of the shape program is programmed beyond the cycle starting point instead of away from it. Incorrect sign on a coordinate value causes the tool path to reverse direction past the starting point. The shape program is written for G71 but used with G72 or vice versa, causing axis direction conflicts. Missing or incorrect incremental versus absolute mode setting causes the shape to extend past the cycle start position.

How do I fix FANUC alarm 322?

1. Open the shape subprogram called by G71 or G72 and identify the very first coordinate move. Verify it moves away from the cycle start point, not back toward or past it. 2. Check the cycle start point coordinates in your G71 or G72 block and compare them to the first point defined in the finishing shape. The shape must begin at or beyond the start point in the cutting direction. 3. Verify the axis direction of your shape profile matches the cycle type. G71 is for Z-axis stock removal so the shape should progress in Z, and G72 is for X-axis so the shape should progress in X. 4. Look for any coordinate sign errors such as a positive value where a negative is needed. A single wrong sign can flip the direction of the profile past the start point. 5. If using incremental programming in the shape, recalculate all incremental values to confirm the cumulative path does not cross back over the starting position. 6. Correct the offending coordinate or direction in the shape program, then dry run the cycle in single block mode to verify the tool path is valid before running the part.

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FANUC Controller

Program/G-code · Intermediate · 20-40 minutes

Alarm 322

Fanuc Alarm 322 - FINISHING SHAPE OVER STARTING POINT

Fanuc Alarm 322 occurs during G71 (turning roughing cycle) or G72 (facing roughing cycle) when the programmed finishing shape extends beyond the cycle starting point in an invalid manner. This is a programming error where the shape definition violates the geometric rules for stock removal cycles, typically when the finishing contour crosses or extends past the point where the cycle was initiated.

FANUCProgram/G-codeIntermediate20-40 minutes

322

Fanuc Alarm 322 - FINISHING SHAPE OVER STARTING POINT

PROGRAM ALARM 322

Root Cause Summary

Fanuc Alarm 322 occurs during G71 (turning roughing cycle) or G72 (facing roughing cycle) when the programmed finishing shape extends beyond the cycle starting point in an invalid manner. This is a programming error where the shape definition violates the geometric rules for stock removal cycles, typically when the finishing contour crosses or extends past the point where the cycle was initiated.

Causes and Fixes

1
Review the G71 or G72 program block and identify the cycle start point coordinates (absolute position before G71/G72 execution).
2
Examine all N-sequence blocks between the starting sequence number (P address) and ending sequence number (Q address) in the shape program. Verify no X coordinates (for G72) or Z coordinates (for G71) extend beyond the cycle initiation point.
3
Check parameter 5143 bit 0 (G71 type selection) to understand which G71 format is active. Type I and Type II have different geometry rules for shape definition.
4
Correct the finishing shape coordinates or reposition the cycle starting point to ensure the finish profile remains within valid boundaries for the selected roughing cycle type.

DIY Feasiblehigh confidence

Call a technician if:

·Parameter changes required beyond operator level
·Persistent alarm after geometry corrections
·Suspected control software issue

Prevention

Always use graphics simulation to verify G71/G72 cycles before running
Establish consistent work coordinate system procedures
Create standard templates for rough turning cycles
Regularly backup and document parameter settings

Common Mistakes

Programming finishing shape that extends past stock material
Mixing absolute and incremental coordinates in P-Q sequence
Forgetting to account for tool nose radius in finishing geometry
Using incorrect line numbers for P and Q references

Related Alarms

321 323 324 010 020

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