How do I fix and clear Mazak alarm 256?

Check the milling spindle tool clamping sensor. If the alarm cannot be cleared by this procedure, please contact the nearest Mazak Technical Center or Technology Center. Clearing procedure: Fix cause → press RESET.

ALARMSMazatrol Assistant

CRITICALAlarm code

256

TOOL CLAMP SENSOR MALFUNCTION

Q: What does Mazak alarm 256 mean?

Mazak alarm 256 is "TOOL CLAMP SENSOR MALFUNCTION". The milling spindle tool clamping sensor has not turned on within 5 seconds after the issue of a milling spindle tool clamp command. Error type: Machine (PLC) — machine failure. Machine state: Feed hold — feed stopped, machine ready.

What it means

The milling spindle tool clamping sensor has not turned on within 5 seconds after the issue of a milling spindle tool clamp command.

What to do

1Check the milling spindle tool clamping sensor.
2If the alarm cannot be cleared by this procedure, please contact the nearest Mazak Technical Center or Technology Center.

Codebook — decoded

FError typeMachine (PLC) — machine failure

KStop statusFeed hold — feed stopped, machine ready

OClearingFix cause → press RESET

Still faulted after these steps? Do not restart under load — ask the Mazatrol assistant.

Still stuck? Ask the Mazatrol assistant →