What causes FANUC alarm 3012?

Corrupted or missing data server files. Ethernet communication issues between the CNC and data server. Insufficient data server memory or storage capacity. Incompatible software versions between the CNC and data server.

How do I fix FANUC alarm 3012?

1. Check the Ethernet connection between the CNC and data server. Ensure the cables are properly connected and not damaged. 2. Verify the data server is powered on and functioning correctly. Check for any error messages or status indicators on the data server. 3. Inspect the data server for any file system issues or corrupted data. Try rebooting the data server and see if the alarm clears. 4. Review the data server configuration and settings to ensure they match the CNC requirements. Update any outdated software or firmware if necessary. 5. If the issue persists, consult the Fanuc documentation or contact Fanuc technical support for further assistance in diagnosing and resolving the data server alarm. 6. As a last resort, you may need to perform a factory reset or reinstallation of the data server software to resolve any underlying issues.

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FANUC Controller

System · Intermediate · 30 minutes to 1 hour

Alarm 3012

FANUC Alarm 3012 - Data Server Alarm

Alarm 3012 indicates the Data Server function has encountered an error during file operations, network communication, or memory management. This is typically caused by corrupted files on the CNC, Ethernet communication timeouts, or Data Server software buffer overflow. The alarm often appears during FOCAS/Ethernet operations or when the internal file system is accessed improperly.

FANUCSystemIntermediate30 minutes to 1 hour

3012

FANUC Alarm 3012 - Data Server Alarm

Root Cause Summary

Alarm 3012 indicates the Data Server function has encountered an error during file operations, network communication, or memory management. This is typically caused by corrupted files on the CNC, Ethernet communication timeouts, or Data Server software buffer overflow. The alarm often appears during FOCAS/Ethernet operations or when the internal file system is accessed improperly.

Causes and Fixes

1
Power cycle the control completely (wait 30 seconds after shutdown) to clear Data Server buffers and reset the service.
Ensure no programs are running and machine is in a safe state before cycling power
2
Check parameter 20152 (Data Server buffer size) and increase if set below default value of 256KB. Typical range is 256-512KB depending on application.
Parameter changes require control restart to take effect
3
Reduce polling frequency or data request size from any connected FOCAS applications, HMIs, or IoT devices communicating with the Data Server.
4
Disable Data Server function temporarily (parameter 20150 bit 0 = 0) to confirm if alarm clears, then re-enable and monitor for recurrence.

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