What causes Siemens SINUMERIK alarm 100154?

Normal control operation generated this status message. User action or program command triggered this notification. System configuration or commissioning activity produced this message. Machine data or parameter change created this notification.

How do I fix Siemens SINUMERIK alarm 100154?

1. Read the complete message text on the SINUMERIK screen — note any parameter values shown. 2. If action is required, follow the instructions in the message. 3. Acknowledge the message on the operator panel to continue operation. 4. Consult the Siemens SINUMERIK alarm documentation for message 100154 if clarification is needed. 5. If this message appears unexpectedly, review recent parameter or configuration changes.

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Siemens SINUMERIK Controller

Program/G-code · Intermediate · 30-120 minutes

Alarm 100154

Siemens 840D 100154 - USB device no longer available, of Extcall no longer

SIEMENS alarm 100154 occurs when a USB device that was previously connected and being used by an external call (Extcall) function becomes unavailable during operation. This typically happens when USB communication is interrupted while the SINUMERIK system is executing external programs or accessing USB-stored data.

Siemens SINUMERIKProgram/G-codeIntermediate30-120 minutes

100154

Siemens 840D 100154 - USB device no longer available, of Extcall no longer

USB device no longer available, of Extcall no longer

Root Cause Summary

SIEMENS alarm 100154 occurs when a USB device that was previously connected and being used by an external call (Extcall) function becomes unavailable during operation. This typically happens when USB communication is interrupted while the SINUMERIK system is executing external programs or accessing USB-stored data.

Safety

Refer to Siemens documentation
Ensure qualified technician performs repairs

Causes and Fixes

1
Check USB physical connection
Verify USB device is properly seated in the USB port on the NCU or HMI unit. Check for loose connections or damaged USB connectors.
Ensure machine is in a safe state before checking connections
2
Verify USB device status
Navigate to HMI > Diagnostics > Hardware > USB to check if the USB device is recognized by the system.
USB devices should show as 'Connected' status in the hardware diagnostics
3
Reset Extcall function
Clear the alarm and restart the Extcall function from the part program or through the HMI interface to re-establish USB communication.

DIY Feasiblehigh confidence

Call a technician if:

·USB hardware replacement needed
·NCU/HMI hardware diagnostics required
·System software corruption suspected

Prevention

Use high-quality USB devices with proper power ratings
Implement proper Extcall timeout values
Regularly check USB connections during maintenance
Avoid removing USB devices during active operations

Common Mistakes

Removing USB device while Extcall is active
Using low-quality or incompatible USB devices
Not setting appropriate timeout values for USB operations
Ignoring USB power supply requirements

Related Alarms

100153 100155 61000

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