16111

Review the part program block referenced in alarm (block %2). Verify an S-word with numeric value is present before M3/M4 command. Example: S1200 M3 (correct) vs. M3 (incorrect).

Check if S0 was programmed - zero speed values may be rejected depending on MD 35100 (SpindleControlType) configuration.

If S-word exists, verify it contains a valid numeric value. Symbolic speed references (e.g., S=VAR1) require prior variable assignment in the program.

Variables must be assigned before use; undefined references trigger this alarm.

Check if the spindle command is in a subroutine or macro call. Ensure S-word is programmed in the scope where M3/M4 executes, not only in the calling program.

Edit the NC program to add the S-word with appropriate spindle speed (e.g., S800 M3). Save and reload the program to NCK memory via HMI or DNC interface.

Navigate to Siemens HMI → Diagnostics → Parameters → MD 31010. Verify SpindleSpeedControl setting (0=open loop, 1=closed loop). Document current value.

Check MD 35100 (SpindleControlType) and MD 35110 (SpindleSpeedFeedback). If MD 35100=1 (analog voltage) or =2 (frequency), confirm MD 31020 does not suppress S-word requirement.

Some configurations allow speed-override-only mode, but NCK validation may still enforce S-word presence per machine builder settings.

If spindle speed should be controlled entirely by handwheel/potentiometer override, consult machine builder documentation to confirm if dummy S-word (e.g., S1000) is required as a placeholder in the program.

Add explicit S-word to NC program block triggering alarm. Re-test spindle command execution.

Identify if the NC program uses multiple spindles (spindle %3 in alarm). Review program structure around tool changes or spindle index commands. Verify each spindle has an S-word programmed before its first M3/M4.

Check parameter MD 32100 (NumberOfSpindles) and spindle assignment logic. Ensure spindle index commands (SPINDL=n) are followed by speed programming (S-word) in the same block or next logical block.

Multi-spindle systems require speed context per spindle; omitting S-word after spindle switch causes 16111.

For spindle orientation (M19), confirm that a speed value was programmed in a prior block still in active memory. If program uses local spindle variables, ensure MD 20070 (SpindleSpeedValue) is properly initialized.

Restructure NC program: program S-word explicitly in the block where spindle command (M3/M4/M19) appears. Test on machine in simulation mode first (NC → Automatic → Single Block).