What causes FANUC alarm 327?

Machine system or function indicated by the alarm name has detected a fault. Control parameter or configuration error related to the alarm condition. Hardware component fault on the CNC or machine. Part program error or illegal operation for the indicated function. Machine interlock or safety condition not satisfied.

How do I fix FANUC alarm 327?

1. Note the alarm number and check the Fanuc alarm screen for any sub-code or additional details. 2. Identify the specific machine system or function from the alarm name. 3. Power cycle the machine to clear transient faults. 4. Consult the Fanuc parameter or operator manual for alarm 327 specific remedy. 5. Contact Fanuc service if the alarm persists after basic troubleshooting.

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FANUC Controller

Program/G-code · Intermediate · 15-30 minutes

Alarm 327

Fanuc Alarm 327 - MODAL CANNOT EXECUTE MULTIPLE REPETITIVE CYCLES

Fanuc Alarm 327 occurs when a multiple repetitive canned cycle (G70-G76 for turning, or G72-G73 for milling) is commanded while another modal canned cycle or incompatible G-code is already active. The control cannot execute multiple canned cycles simultaneously or in conflicting modal states. This is strictly a programming error where cycle calls are improperly nested or modal conditions are not cancelled before invoking a new cycle.

FANUCProgram/G-codeIntermediate15-30 minutes

327

Fanuc Alarm 327 - MODAL CANNOT EXECUTE MULTIPLE REPETITIVE CYCLES

SYSTEM ALARM 327

Root Cause Summary

Fanuc Alarm 327 occurs when a multiple repetitive canned cycle (G70-G76 for turning, or G72-G73 for milling) is commanded while another modal canned cycle or incompatible G-code is already active. The control cannot execute multiple canned cycles simultaneously or in conflicting modal states. This is strictly a programming error where cycle calls are improperly nested or modal conditions are not cancelled before invoking a new cycle.

Causes and Fixes

1
Review the program at the alarm line and preceding blocks. Identify all active canned cycles by tracing backwards from the alarm point to find G70-G76 commands that were not cancelled with G80 or a positioning G-code (G00/G01).
2
Insert G80 (canned cycle cancel) or G00 positioning move before the new multiple repetitive cycle command to explicitly cancel the previous modal cycle state.
3
Verify that multiple repetitive cycles are not nested within each other. Each G70-G76 cycle must complete and be cancelled before another can be invoked.
4
Check parameter 5101 (G-code system setting) to confirm the control is using the expected G-code system (A/B/C). Some cycles behave differently across systems and may cause modal conflicts.

DIY Feasiblehigh confidence

Call a technician if:

·Parameter changes required
·Persistent alarm after program corrections
·Machine-specific OEM restrictions identified

Prevention

Always program canned cycles in main program
Establish modal states before cycle initiation
Use consistent coordinate systems throughout cycles
Avoid G52 local coordinates with repetitive cycles

Common Mistakes

Programming cycles within subroutines
Changing H-codes during cycle repetitions
Using G91 incremental mode with multiple cycles
Activating G52 during repetitive operations

Related Alarms

326 328 010 020

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