Applicable Systems
MAZATROL MATRIX
MAZATROL Smooth
INTEGREX
Symptoms
Alarm 1021: Ethernet Link Down. The Ethernet connection to the CNC has been lost. DNC and remote access are unavailable.
Possible Causes
- Hardware or software issue related to: Ethernet Link Down
- Component failure or communication error
- Environmental factor (temperature, power, contamination)
- Configuration or parameter error
Troubleshooting Steps
- Step 1: Read alarm 1021 on the Mazak CNC display and note the full message
Alarm code and description captured for diagnosis - Step 2: Check machine status and identify any visible mechanical, electrical, or pneumatic issues
Fault condition identified or confirmed as intermittent - Step 3: Consult the Mazak maintenance manual for alarm-specific procedures
Root cause identified per Mazak guidelines - Step 4: Apply the recommended fix and reset the alarm
Alarm cleared and machine resumed normal operation
How to Reset
To reset alarm 1021: 1) Address the root cause. 2) Press the RESET key on the CNC panel. 3) If alarm persists, cycle power to the control. Caution: Repeated alarms without fixing the cause may cause damage.
Frequently Asked Questions
- Q: What does Mazak alarm 1021 mean?
Alarm 1021 indicates: Ethernet Link Down. The Ethernet connection to the CNC has been lost. DNC and remote access are unavailable.
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Source: Mazak MAZATROL Matrix/SmoothX Maintenance Manual, helmanCNC.com
Category: CNC
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