Okuma Alarm A-1097 – Safety Speed Monitor Error
Alarm A-1097 indicates a malfunction in the Safety Speed Monitor system during guard-close operation in production mode.
The Safety Speed Monitor signal did not turn ON within the specified time after the safety guard was closed.
Alternatively, the CNC control received an incorrect mode signal (production / setting / test).
This alarm is related to the machine’s safety monitoring circuit and prevents operation when spindle or axis speed verification fails.
Common causes include:
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Faulty Safety Speed Monitor unit
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Incorrect safety mode signal
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Wiring or connector issue
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Guard switch malfunction
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PLC or safety circuit fault
The machine stops to ensure operator safety.
Recommended actions:
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Check guard interlock switches.
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Verify safety circuit status in diagnostics.
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Inspect Safety Speed Monitor wiring and signals.
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Confirm correct machine mode selection.
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Restart the machine after resolving the issue.
If the alarm persists, inspect the safety monitoring hardware and PLC interface.
