What causes Siemens SINUMERIK alarm 100155?

Required machine data or parameter not configured for the requested function. Option bit not set in SINUMERIK to enable the required functionality. Program references a function or axis that has not been configured. Machine commissioning incomplete — required setup step was not performed. Configuration data cleared or lost due to a parameter reset or hardware change.

How do I fix Siemens SINUMERIK alarm 100155?

1. Read the full alarm message to identify what is missing (axis name, parameter number, function name). 2. Consult the SINUMERIK alarm manual for alarm 100155 for the specific configuration requirement. 3. Check the relevant machine data group and set the required parameter. 4. If a specific option is required, verify it is licensed and enabled in the SINUMERIK option settings. 5. Power cycle after making configuration changes to apply the new settings.

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Siemens SINUMERIK Controller

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

Alarm 100155

Siemens 840D 100155 - USB device no longer available, editing is. The last changes

SIEMENS alarm 100155 occurs when a USB storage device is unexpectedly disconnected or becomes inaccessible during active file editing operations on the SINUMERIK control. This interrupts the data transfer process and forces the system to abort the current editing session to prevent data corruption.

Siemens SINUMERIKProgram/G-codeIntermediate30-120 minutes

100155

Siemens 840D 100155 - USB device no longer available, editing is. The last changes

USB device no longer available, editing is. The last changes

Root Cause Summary

SIEMENS alarm 100155 occurs when a USB storage device is unexpectedly disconnected or becomes inaccessible during active file editing operations on the SINUMERIK control. This interrupts the data transfer process and forces the system to abort the current editing session to prevent data corruption.

Safety

Refer to Siemens documentation
Ensure qualified technician performs repairs

Causes and Fixes

1
Check USB device connection
Verify the USB device is properly inserted into the SINUMERIK control's USB port and the connection LED (if present) is active.
Use only industrial-grade USB devices rated for CNC environments to avoid connection issues.
2
Test USB device functionality
Navigate to HMI > Services > USB and verify the device appears in the file manager. Check if files can be accessed normally.
Do not remove USB devices during active file operations to prevent data loss.
3
Restart editing session
Close any open editors, reinsert the USB device if needed, and restart the program editing from HMI > Program Manager.
Save work frequently to local memory before transferring to USB to minimize data loss.

DIY Feasiblehigh confidence

Call a technician if:

·Multiple USB ports fail with known good devices
·Power supply voltages are out of specification
·Hardware diagnostics show USB interface faults

Prevention

Use only industrial-grade USB devices rated for CNC environments
Safely eject USB devices through HMI before physical removal
Regularly backup programs to control memory before USB transfer
Avoid using high-capacity or USB 3.0 devices that may exceed power limits

Common Mistakes

Removing USB devices during active file operations
Using consumer-grade USB devices in industrial environments
Ignoring file system errors on USB devices
Not checking USB device compatibility before use

Related Alarms

100150 100151 100156

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Always verify with your machine manual or a certified technician before performing service procedures.