What causes Siemens SINUMERIK alarm 16747?

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 16747?

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 16747 specific remedy.

axismd.ai

Siemens SINUMERIK Controller

Spindle · Intermediate · 30-120 minutes

Alarm 16747

Siemens 840D 16747 - Channel block spindle inserted gear stage for tapping not

Alarm 16747 occurs when G331 (tapping cycle) attempts to activate a gear stage in the second spindle gear stage data block that has not been physically installed or configured. The requested gear stage number exceeds the quantity of installed gear stages defined in machine data MD 35092 (NUM_GEAR_STEPS2), causing the spindle gear shift to fail during tapping cycle execution.

Siemens SINUMERIKSpindleIntermediate30-120 minutes

16747

Siemens 840D 16747 - Channel block spindle inserted gear stage for tapping not

Channel block spindle inserted gear stage for tapping not

Root Cause Summary

Alarm 16747 occurs when G331 (tapping cycle) attempts to activate a gear stage in the second spindle gear stage data block that has not been physically installed or configured. The requested gear stage number exceeds the quantity of installed gear stages defined in machine data MD 35092 (NUM_GEAR_STEPS2), causing the spindle gear shift to fail during tapping cycle execution.

Safety

Refer to Siemens documentation
Ensure qualified technician performs repairs

Causes and Fixes

1
Verify MD 35092 (NUM_GEAR_STEPS2) setting in NCK parameters. Access via HMI > Diagnostics > Machine Data > Spindle or via SINUMERIK Operate interface. Note the configured number of gear stages for second spindle.
2
Cross-reference the G331 tapping block (block %2) to identify the requested gear stage (%4). Check the NC program for GFPA or gear stage selection command preceding the tapping cycle.
3
Physically verify installed gear stages on the second spindle. Confirm that the requested gear stage hardware is mounted and coupled to the spindle drive. Compare to MD 35092 configuration.
Do not proceed with spindle rotation if gear stage hardware inspection reveals missing or damaged components.
4
If gear stage hardware is installed but MD 35092 is incorrect, update MD 35092 (NUM_GEAR_STEPS2) to match physical installation. Reset NCK via HMI > Machine > Reset or power cycle. Re-execute G331 tapping cycle.

Service Recommended confidence

Seeing Multiple Alarms?

Seeing another alarm with this one? Enter the code.

Get machine-aware diagnosis

AxisMD logs alarms against your actual machines, tracks patterns, and gives AI context your manual doesn't have.

Start free

Was this guide helpful?

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