Okuma Alarm A-1122 – Safety Controller Error
Okuma Alarm A-1122 indicates a malfunction in the machine’s safety controller system.
This alarm occurs when the CNC control detects an error in the safety controller responsible for supervising critical safety functions of the machine.
The safety controller monitors various safety-related signals such as emergency stop circuits, door interlocks, safety relays, and other protective systems. If the controller detects an internal fault or receives invalid safety signals, the CNC system triggers Alarm A-1122 to prevent unsafe machine operation.
Possible causes
Several issues may trigger this alarm:
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Internal fault in the safety controller module
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Failure of safety relays or safety circuits
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Emergency stop circuit malfunction
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Safety door switch or interlock problem
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Wiring or connector issues in the safety circuit
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Communication error between the safety controller and CNC control
What happens when this alarm appears
When Alarm A-1122 occurs, the CNC system detects that the safety monitoring system is not functioning correctly.
For safety reasons, the machine will usually stop operation and prevent further movement until the issue is resolved.
Recommended actions
To troubleshoot this alarm, the following steps are recommended:
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Restart the CNC machine and check if the alarm appears again.
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Verify that all emergency stop buttons are released.
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Check safety door switches and interlock circuits.
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Inspect safety wiring and connectors for damage or loose contacts.
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Test the safety controller module and related safety relays.
Professional repair service
If the alarm persists, the issue may be caused by a faulty safety controller module or damaged control electronics.
Our technicians specialize in Okuma CNC electronics diagnostics and repair, including control boards, safety controllers, and other CNC electronic modules.
