What causes FANUC alarm 145?

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 145?

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 145 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 145

Fanuc Alarm 145 - ILLEGAL USE OF G12.1/G13.1

Alarm 145 occurs when G12.1 (polar coordinate interpolation ON) or G13.1 (polar coordinate interpolation OFF) is programmed with an invalid axis specification or plane selection that doesn't match the machine configuration. This typically happens when the specified axes for polar interpolation are not properly configured as a valid plane, or when attempting polar interpolation on an axis combination not supported by the control parameters.

FANUCProgram/G-codeIntermediate15-30 minutes

145

Fanuc Alarm 145 - ILLEGAL USE OF G12.1/G13.1

SYSTEM ALARM 145

Root Cause Summary

Alarm 145 occurs when G12.1 (polar coordinate interpolation ON) or G13.1 (polar coordinate interpolation OFF) is programmed with an invalid axis specification or plane selection that doesn't match the machine configuration. This typically happens when the specified axes for polar interpolation are not properly configured as a valid plane, or when attempting polar interpolation on an axis combination not supported by the control parameters.

Causes and Fixes

1
Review the program line causing the alarm. Verify G12.1/G13.1 syntax matches format: G12.1 or G12.1 I__ J__ (center coordinates). Check that axis addresses specified exist in machine configuration.
2
Navigate to SYSTEM > PARAM and check parameter 1022 (number of controlled axes). Verify the axes referenced in polar interpolation command do not exceed this value.
3
Verify plane selection G-code (G17/G18/G19) is active before G12.1 command. G12.1 uses the currently selected plane. Check parameters 1022-1025 for valid plane axis assignments.
4
Correct program to use valid axis combination. Standard: G17 (X-Y plane), G18 (Z-X plane), G19 (Y-Z plane) before issuing G12.1. Ensure only two axes are involved in the polar interpolation plane.
Never use G12.1 without first selecting a valid plane with G17, G18, or G19

DIY Feasiblehigh confidence

Call a technician if:

·Parameter changes don't resolve the issue
·Software options are missing or expired
·Axis configuration requires hardware changes

Prevention

Always specify plane selection (G17/G18/G19) before using G12.1/G13.1
Verify axis names match machine configuration before programming polar interpolation
Test polar coordinate programs in single block mode first

Common Mistakes

Using axis names not configured on the machine
Forgetting to specify working plane before polar interpolation
Mixing up axis numbers and axis names in polar commands

Related Alarms

010 011 020 501

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