What causes Siemens SINUMERIK alarm 16780?

Part program contains an illegal or unsupported command for the current machine configuration. Channel or axis configuration does not support the programmed function. Required machine option not enabled for the commanded function. Axis assignment or transformation configuration error. Program execution sequence error.

How do I fix Siemens SINUMERIK alarm 16780?

1. Identify the program block that triggered the alarm — note the channel and block number. 2. Review the commanded function against the SINUMERIK programming manual. 3. Check if the required machine option is enabled for this function. 4. Verify axis assignments and transformation settings are correct for the application. 5. Consult the Siemens SINUMERIK alarm manual for alarm 16780 specific remedy.

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Siemens SINUMERIK Controller

Spindle · Intermediate · 30-120 minutes

Alarm 16780

Siemens 840D 16780 - Channel block following spindle/axis missing

Alarm 16780 occurs when a part program references a spindle or axis in a synchronized motion command (e.g., SPOS, SPOSA, or thread-cutting functions) without that spindle/axis being declared or configured in the channel. This is a program syntax error where the NCK cannot locate the specified spindle/axis identifier in the active channel's axis/spindle configuration.

Siemens SINUMERIKSpindleIntermediate30-120 minutes

16780

Siemens 840D 16780 - Channel block following spindle/axis missing

Channel block following spindle/axis missing

Root Cause Summary

Alarm 16780 occurs when a part program references a spindle or axis in a synchronized motion command (e.g., SPOS, SPOSA, or thread-cutting functions) without that spindle/axis being declared or configured in the channel. This is a program syntax error where the NCK cannot locate the specified spindle/axis identifier in the active channel's axis/spindle configuration.

Safety

Refer to Siemens documentation
Ensure qualified technician performs repairs

Causes and Fixes

1
Review the part program block listed in alarm message (block %2). Identify the axis or spindle reference (e.g., S1, SPOS, FGROUP command). Check the syntax and spindle/axis name used.
2
In Siemens HMI, navigate to Maintenance > Machine Data and verify MD 32010 (Spindle assignment to channel) and MD 33010 (Axis assignment to channel) contain the referenced spindle/axis. Cross-reference with MD 37100 (Channel assignment table).
3
If the spindle/axis exists but is not in the active channel, either add it via machine data configuration or specify the correct spindle/axis name in the part program that matches the channel's configuration.
Machine data changes require machine restart via POWER ON cycle.
4
Verify spindle/axis names are case-sensitive and match exactly (e.g., 'S1' vs 's1' or 'MAIN' vs 'Main'). Reload the part program into the NCK buffer after corrections.

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