Okuma Alarm A-1104 – DeviceNet Slave in Idle Mode
Alarm A-1104 indicates that a DeviceNet slave station has entered Idle mode.
DeviceNet is an industrial communication network used for data exchange between the CNC control and peripheral devices such as I/O modules, drives, sensors, tool changers, or loaders. When this alarm appears, one of the slave devices on the DeviceNet network is not in active communication mode and has switched to Idle state.
When this alarm occurs:
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Communication with the affected slave device is inactive
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Related machine functions may not operate
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I/O signals from that device may not update
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Automatic operation may be interrupted
Possible causes include:
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Slave device powered off
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Communication cable disconnected or damaged
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Network configuration mismatch
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Incorrect node address
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DeviceNet master/slave synchronization failure
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Hardware fault in the slave module
Recommended actions:
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Verify that the slave device is powered on.
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Check DeviceNet cables and connectors.
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Inspect network status LEDs on master and slave units.
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Confirm correct node address settings.
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Restart the machine to reinitialize the network.
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Perform DeviceNet diagnostics if the issue persists.
This alarm typically indicates a communication state issue rather than a fatal hardware failure, but machine operation may remain limited until the network returns to active mode.
