What causes Siemens SINUMERIK alarm 10820?

Parameter or machine data configuration error. Hardware fault on the NC or drive component. Part program error or illegal command. Communication fault between NC and drive or I/O modules. Software or firmware error requiring system restart.

How do I fix Siemens SINUMERIK alarm 10820?

1. Note the complete alarm text including any axis, channel, or block number values. 2. Check for related alarms active simultaneously in the SINUMERIK alarm list. 3. Power cycle the machine to clear transient faults. 4. Review the SINUMERIK machine data for parameters related to the alarm. 5. Consult the Siemens SINUMERIK alarm manual for alarm 10820 detailed remedy.

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Siemens SINUMERIK Controller

Spindle · Intermediate · 30-120 minutes

Alarm 10820

Siemens 840D 10820 - Channel rotary axis/spindle not defined

Alarm 10820 fires when a revolutional feed (FGROUP or F with spindle reference) is programmed for a contouring/synchronous axis or spindle, but the referenced rotary axis/spindle is not configured in the NCK axis definition table. This occurs because the interpolator cannot resolve the feed calculation without a valid axis reference.

Siemens SINUMERIKSpindleIntermediate30-120 minutes

10820

Siemens 840D 10820 - Channel rotary axis/spindle not defined

Channel rotary axis/spindle not defined

Root Cause Summary

Alarm 10820 fires when a revolutional feed (FGROUP or F with spindle reference) is programmed for a contouring/synchronous axis or spindle, but the referenced rotary axis/spindle is not configured in the NCK axis definition table. This occurs because the interpolator cannot resolve the feed calculation without a valid axis reference.

Safety

Refer to Siemens documentation
Ensure qualified technician performs repairs

Causes and Fixes

1
Access Siemens HMI > Diagnosis > System > Axis list to verify all active axes and spindles. Confirm the referenced axis name from the alarm parameter %2 appears in the configured axis table.
Do not edit axis definitions while machine is in operation or program is running.
2
Check MD20050 (Names of axes/spindles) and MD20100 (Type of axis, default: linear=1, rotary=2) in the Siemens NCK Parameter Editor. Verify the spindle/rotary axis referenced in the NC program matches exactly (case-sensitive).
3
If the axis is missing, add it to the axis configuration via HMI > Machine > Axis Configuration. Assign axis type MD20100=2 for rotary axes. Save and restart the NCK.
Configuration changes require a warm restart; some systems may require a cold restart.
4
Reload the NC program and verify the axis name in the F-word or FGROUP command matches the configured axis name exactly (including spindle index if multiple spindles exist).

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