FANUC SV1067 Alarm: FSSB Configuration Error Software Troubleshooting

FANUC SV1067 alarm usually means the actual servo amplifier hardware connection does not match the FSSB parameter configuration. The key checks are the amplifier connection status, parameter P1902, servo axis number settings P987/P988, servo axis valid setting P11802#4, FSSB automatic or manual setting, and amplifier/system compatibility.

This alarm is often caused by a mismatch between the connected servo amplifier type and the FSSB setting value. Before replacing hardware, first use the FSSB setting screen to confirm which amplifier is recognized and which amplifier or axis is abnormal.

What Does FANUC SV1067 Alarm Mean?

FANUC SV1067 is an FSSB configuration error. It means the CNC system has detected that the hardware connection condition and the parameter configuration do not match.

In practical troubleshooting, SV1067 often appears after servo amplifier replacement, CNC parameter loss, FSSB parameter modification, incorrect axis setting, or when the connected servo amplifier version is not compatible with the CNC system version.

Main Alarm Information

Common Causes of SV1067 Alarm

• The actual servo amplifier connection does not match the FSSB setting
• The connected amplifier type is different from the parameter configuration
• FSSB automatic setting was not completed correctly
• FSSB manual setting values are incorrect
• Servo axis number setting is incorrect
• P987/P988 servo axis number setting does not match the machine configuration
• P11802#4 servo axis valid setting is incorrect
• Amplifier version is not compatible with the CNC system version
• Parameter loss or wrong parameter backup after CNC maintenance

Recommended Troubleshooting Order

1. Check the actual servo amplifier hardware connection.
2. Use the FSSB setting screen to confirm which amplifiers are recognized.
3. Set parameter P1902 to 0, restart the machine, and confirm whether all amplifiers are detected.
4. Set the correct number of servo axes with P987/P988.
5. Confirm that the servo axis is valid by setting P11802#4 = 0.
6. Use the FSSB screen to perform automatic FSSB setting.
7. If automatic setting does not work, use manual FSSB setting methods such as Manual 1/2.
8. Check whether the connected servo amplifier version is compatible with the CNC system version.

Step 1: Confirm the Actual Servo Amplifier Connection

First, check the real hardware connection of all servo amplifiers. Confirm the amplifier order, FSSB optical cable connection, amplifier model, axis connection, and whether each amplifier is powered and connected correctly.

Then enter the system FSSB setting screen and check the detected amplifier status. This helps identify which amplifier or axis is inconsistent with the current FSSB parameter setting.

Step 2: Check Parameter P1902 and Restart

Set parameter P1902 to 0 and restart the machine. After restart, check the FSSB screen again to confirm whether all connected amplifiers can be recognized by the system.

If some amplifiers are not detected, check the amplifier hardware connection, optical cable connection, power supply, and amplifier compatibility before adjusting other parameters.

Step 3: Check Servo Axis Number Settings P987/P988

Check whether the correct number of servo axes is set in P987/P988. If the servo axis number setting does not match the actual machine configuration, the system may report SV1067.

This is especially important after adding, removing, replacing, or rearranging servo amplifiers.

Step 4: Confirm Servo Axis Valid Setting P11802#4

Check the servo axis valid setting. In this case, confirm that P11802#4 = 0 so that the servo axis is enabled correctly.

If the servo axis valid setting is wrong, the system may not match the real amplifier connection with the FSSB configuration.

Step 5: Perform FSSB Automatic Setting

After confirming the hardware connection and servo axis number settings, use the FSSB screen to perform automatic FSSB setting.

Automatic setting is useful when the amplifier connection is normal and the system can detect all connected amplifiers correctly.

Step 6: Use Manual FSSB Setting If Needed

If automatic FSSB setting cannot correctly match the machine configuration, use manual FSSB setting methods such as Manual 1/2. The related setting procedure can be referenced from the FANUC connection function manual, such as section 1.4.3 of B-64603.

Manual setting is often needed when the machine has special axis configuration, additional axes, unusual amplifier arrangement, or when automatic setting does not match the actual machine structure.

Step 7: Check Amplifier and System Version Compatibility

Check whether the connected servo amplifier version is compatible with the CNC system version. If the amplifier type or version is not supported by the system, the FSSB setting may not match correctly and SV1067 may occur.

This should be checked carefully when the alarm appears after replacing a servo amplifier with a different model, series, or hardware version.

SV1067 Diagnostic Table

When Does SV1067 Commonly Appear?

• After replacing a servo amplifier
• After changing FSSB optical cable connection
• After CNC parameter loss
• After restoring parameters from an incorrect backup
• After modifying FSSB-related parameters
• After changing servo axis number settings
• After using an incompatible amplifier version

Important Notes Before Changing FSSB Parameters

Before changing FSSB-related parameters, back up the original CNC parameters first. Incorrect FSSB settings may cause servo axis mismatch, amplifier recognition problems, or additional servo alarms.

If the machine has special axis configuration, gantry axis, rotary axis, loader axis, or custom machine builder settings, compare the current parameters with the original machine backup before performing automatic or manual FSSB setting.

Parts and Areas Related to SV1067 Alarm

• FANUC servo amplifier
• FSSB optical cable connection
• FSSB setting screen
• Servo axis number parameters P987/P988
• Parameter P1902
• Parameter P11802#4
• CNC system version and amplifier compatibility
• Original machine parameter backup

Need Help with FANUC SV1067 Alarm?

REACO CNC provides technical support for FANUC FSSB configuration errors, servo amplifier recognition problems, FSSB automatic and manual setting issues, servo axis assignment checking, and FANUC CNC spare parts supply. If your machine shows SV1067 alarm, our team can help you analyze whether the issue is caused by hardware connection mismatch, incorrect FSSB parameters, servo axis number setting, amplifier compatibility, or CNC parameter loss.

You can contact REACO CNC and send us photos of the alarm screen, CNC system model, FSSB setting screen, servo amplifier model, amplifier connection order, optical cable connection, P987/P988 values, P1902 setting, P11802#4 status, and recent maintenance history. We can help confirm the likely cause and recommend suitable troubleshooting, repair, or replacement options for your FANUC CNC system.

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