What causes FANUC alarm 175?

An axis specified in the G07.1 block is not configured or enabled for cylindrical interpolation in the machine parameters.. More than one axis was programmed in a single G07.1 block, which is not allowed - only one rotary axis can be specified at a time.. A linear axis was specified instead of the correct rotary axis for cylindrical interpolation.. The rotary axis name used in the G07.1 block does not match the axis name defined in the CNC parameters for cylindrical interpolation.. The G07.1 command was used on a machine or control configuration that does not have the cylindrical interpolation option enabled..

How do I fix FANUC alarm 175?

1. Open the part program and find the G07.1 block causing the alarm. Verify that only one axis is specified in that block and that it is the correct rotary axis name (typically A, B, or C). 2. Check that you are not specifying a linear axis (X, Y, Z) in the G07.1 command. The axis must be a rotary axis configured for cylindrical interpolation. 3. If only one axis is specified and it looks correct, check machine parameter 1022 to confirm the axis type assignments and verify the rotary axis is properly defined in the control. 4. Confirm the cylindrical interpolation option is enabled on this control by checking the option parameters or contacting your machine tool builder if you are unsure. 5. Correct the G07.1 block in the program to specify only the valid rotary axis, then cancel cylindrical interpolation with G07.1 axis 0 at the end of the cycle and rerun the program.

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FANUC Controller

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

Alarm 175

Fanuc Alarm 175 - ILLEGAL G07.1 AXIS

Alarm 175 occurs when the G07.1 (Cylindrical Interpolation) command contains an improperly specified axis or multiple axes in the activation block. The CNC requires only a single rotary axis to be designated as the cylindrical axis, and linear axes X, Y, Z must be capable of coordinated movement with it according to parameter settings.

FANUCProgram/G-codeIntermediate15-30 minutes

175

Fanuc Alarm 175 - ILLEGAL G07.1 AXIS

Circular Interpolation Plane Error

Root Cause Summary

Alarm 175 occurs when the G07.1 (Cylindrical Interpolation) command contains an improperly specified axis or multiple axes in the activation block. The CNC requires only a single rotary axis to be designated as the cylindrical axis, and linear axes X, Y, Z must be capable of coordinated movement with it according to parameter settings.

Safety

Incorrect interpolation can cause unexpected tool movement and potential collisions
Before making any changes to the program or machine parameters, ensure you understand the potential consequences. Incorrect changes can lead to unexpected machine behavior and potential damage or injury.
Be aware of the machine's rapid traverse rate. Incorrect arc programming can cause the machine to move unexpectedly at high speed. Keep your hand on the feed hold button.
Ensure that the workholding is secure and that the workpiece is properly clamped before running the program. Unexpected machine movements can dislodge the workpiece.
If the machine is equipped with a safety door or light curtain, ensure that it is functioning correctly before running the program. This will help to prevent injury in the event of an unexpected machine movement.
Electrical Hazard: Power down and lock out the machine before performing any electrical troubleshooting or component replacement. Only qualified personnel should perform electrical work.
Ensure the machine is powered off or in a safe mode before making any changes to avoid accidental movement.
Wear appropriate personal protective equipment (PPE) when accessing the control interface.

Causes and Fixes

1
Review the program line containing G07.1. Correct format is 'G07.1 C_' where C is the rotary axis. Remove any additional axis specifications (X, Y, Z, or additional rotary axes) from this block.
2
Verify parameter 1022 bit 5 (CYL) is set to 1 to enable cylindrical interpolation function. Access via SYSTEM > PARAM > [1022] and check bit configuration.
3
Confirm the specified rotary axis matches the axis designated in parameter 1025 (Cylindrical Interpolation Axis Number). Common setting is 3 for C-axis on mill-turn machines.
4
Test with simplified G07.1 block specifying only the single rotary axis, followed by G07.1 IP0 (cancel) to verify proper modal activation.

DIY Feasiblehigh confidence

Call a technician if:

·Parameter 1006 modification required
·Cylindrical interpolation option not installed
·Machine builder parameter configuration needed

Prevention

Always verify axis capabilities before programming G07.1
Use machine documentation to confirm supported interpolation modes
Test cylindrical interpolation programs in single block mode first

Common Mistakes

Programming three or more axes in G07.1 block
Using linear axes only without rotary axis
Not cancelling conflicting modal G-codes before G07.1

Related Alarms

010 011 020

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