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Siemens SINUMERIK Controller
Spindle · Intermediate · 30-120 minutes
Siemens 840D 16830 - Channel block incorrect position programmed for axis/spindle
Alarm 16830 fires when a position value outside the valid modulo range (0-359.999°) is programmed for a rotary axis configured as a modulo axis in the NC part program. This violation occurs during block interpretation in the NCK when the interpreter detects an out-of-range position command for an axis with modulo arithmetic enabled (typically spindle or rotary axes with MD32000 configured for modulo behavior).
16830
Siemens 840D 16830 - Channel block incorrect position programmed for axis/spindle
Channel block incorrect position programmed for axis/spindle
Siemens SINUMERIK 840D alarm 16830: Channel block incorrect position programmed for axis/spindle. This alarm indicates a program or channel-level error on the SINUMERIK control. The part program or machine function cannot be executed as commanded.
Root Cause Summary
Alarm 16830 fires when a position value outside the valid modulo range (0-359.999°) is programmed for a rotary axis configured as a modulo axis in the NC part program. This violation occurs during block interpretation in the NCK when the interpreter detects an out-of-range position command for an axis with modulo arithmetic enabled (typically spindle or rotary axes with MD32000 configured for modulo behavior).
Safety
- Refer to Siemens documentation
- Ensure qualified technician performs repairs
Causes and Fixes
- 1
Review the NC part program block %2 cited in the alarm. Locate the axis position command (e.g., 'A=370' or 'C=-45') for axis %3 and verify the programmed value is within 0-359.999°.
Check both absolute (G90) and incremental (G91) modes; incremental moves may compound to out-of-range values.
- 2
Verify axis %3 modulo configuration by accessing Diagnostics > Parameters > Machine Data (MD) and checking MD32000 (axis-specific) and related MD35100 series entries. Confirm bits defining modulo behavior match the axis type.
Modulo axes are typically spindles or rotary axes; standard linear axes should not have modulo enabled.
- 3
Correct the NC program to use modulo-compliant positions. For values >360°, apply modulo arithmetic (e.g., 370° becomes 10°). Use FRAC() function or manual calculation: Position_Corrected = Position_Programmed MOD 360.
- 4
Re-download and verify the corrected program via the NCK. Test with a dry-run (JOG mode with feedrate override =0%) to confirm block interpretation without alarm 16830.
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