What causes FANUC alarm 5218?

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 5218?

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 5218 specific remedy. 5. Contact Fanuc service if the alarm persists after basic troubleshooting.

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FANUC Controller

System · Intermediate · 30-60 minutes

Alarm 5218

Fanuc Alarm 5218 - ILLEGAL PARAMETER (INCL. COMP)

Fanuc alarm 5218 indicates an illegal parameter configuration related to inclination compensation functionality, typically on machines with rotary axes (A, B, C). This occurs when compensation parameters are inconsistent, out of range, or incompatible with the current machine configuration or control software version.

FANUCSystemIntermediate30-60 minutes

5218

Fanuc Alarm 5218 - ILLEGAL PARAMETER (INCL. COMP)

SYSTEM ALARM 5218

Root Cause Summary

Fanuc alarm 5218 indicates an illegal parameter configuration related to inclination compensation functionality, typically on machines with rotary axes (A, B, C). This occurs when compensation parameters are inconsistent, out of range, or incompatible with the current machine configuration or control software version.

Causes and Fixes

1
Navigate to SYSTEM > PARAM and search for parameter 19500 (inclination compensation enable). Verify bit settings match your machine's rotary axis configuration (typically bit 0=A-axis, bit 1=B-axis, bit 2=C-axis enable).
2
Check parameters 19501-19510 for compensation axis assignment and direction codes. Valid values are typically 0-5 representing +/-X, +/-Y, +/-Z axes. Values outside this range trigger the alarm.
3
Review parameters 19520-19599 containing compensation data tables. Each entry must be within machine travel limits and monotonically increasing. Use SYSTEM > PARAM > [SRCH] function to locate and verify each table entry.
4
If parameters appear valid, perform a parameter backup, then reset inclination compensation parameters to default (set P19500 to 0, clear all data tables). Power cycle and re-enable compensation incrementally to isolate the problematic parameter.
Disabling inclination compensation will affect machining accuracy on parts requiring rotary axis positioning. Notify production before making changes.

DIY Feasiblehigh confidence

Call a technician if:

·Software option requires enabling
·Parameter corruption persists after restoration
·Machine geometry measurements needed

Prevention

Maintain current parameter backups
Monitor battery voltage regularly
Document inclination settings during installation
Verify software options before parameter changes

Common Mistakes

Setting inclination angles without measuring actual machine tilt
Enabling compensation without proper software option
Using incorrect parameter number ranges
Forgetting to power cycle after parameter changes

Related Alarms

5000 5010 5200

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