What causes Siemens SINUMERIK alarm 101020?

Part program contains an illegal or unsupported command for the current machine configuration. Parameter or machine data setting incompatible with the commanded operation. Required option or function not enabled on this SINUMERIK control. Incorrect axis assignment or configuration for the commanded function. Software version or compile cycle version mismatch.

How do I fix Siemens SINUMERIK alarm 101020?

1. Note the full alarm message including any parameter values shown (e.g., axis number, block number, channel). 2. Identify the program block or operation that triggered the alarm. 3. Review the SINUMERIK alarm manual for alarm 101020 to identify the specific cause and remedy. 4. Check the relevant machine data parameters referenced in the alarm. 5. If the alarm persists after correcting the program, contact Siemens technical support with the full alarm text and machine data backup.

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Siemens SINUMERIK Controller

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

Alarm 101020

Siemens 840D 101020 - Not possible to backup the HMI internal PLC status!

Alarm 101020 indicates a failure in backing up the HMI (Human Machine Interface) internal PLC status data. This typically occurs due to insufficient memory on the HMI compact flash card, corrupted file system structures, or PLC communication issues preventing the backup process from completing successfully.

Siemens SINUMERIKProgram/G-codeIntermediate30-120 minutes

101020

Siemens 840D 101020 - Not possible to backup the HMI internal PLC status!

Not possible to backup the HMI internal PLC status!

Root Cause Summary

Alarm 101020 indicates a failure in backing up the HMI (Human Machine Interface) internal PLC status data. This typically occurs due to insufficient memory on the HMI compact flash card, corrupted file system structures, or PLC communication issues preventing the backup process from completing successfully.

Safety

Refer to Siemens documentation
Ensure qualified technician performs repairs

Causes and Fixes

1
Access HMI service screen by pressing HMI softkey combination (usually Recall + Alarm + Help simultaneously) and navigate to file manager.
2
Check available free space on compact flash card (/card or /cf directory). Minimum 50MB free space required for PLC backup.
3
Delete old backup files from /user/sinumerik/backup/ directory and clear unnecessary log files from /user/log/ directory.
Create external backup copies of important files before deletion. Do not delete system files or directories.
4
Retry PLC backup operation from HMI commissioning menu or PLC > Backup function after freeing sufficient space.

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