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Siemens SINUMERIK Controller
Spindle · Intermediate · 30-120 minutes
Siemens 20211 - Block spindle support point beyond range limits
Alarm 20211 fires when the NCK calculates a support point for centerless grinding operation that exceeds the physical machine limits defined in MD 21518 (upper limit) or MD 21520 (lower limit). This occurs during TRACLG (traverse along contour for centerless grinding) when geometric calculations or workpiece positioning push the support point beyond configurable range boundaries.
20211
Siemens 20211 - Block spindle support point beyond range limits
Block spindle support point beyond range limits
The support point calculated for centerless grinding is beyond the range limits. Machine data: Modify MD21518 $MC_TRACLG_CONTACT_UPPER_LIMIT Modify MD21520 $MC_TRACLG_CONTACT_LOWER_LIMIT Control reaction: Alarm display.
Root Cause Summary
Alarm 20211 fires when the NCK calculates a support point for centerless grinding operation that exceeds the physical machine limits defined in MD 21518 (upper limit) or MD 21520 (lower limit). This occurs during TRACLG (traverse along contour for centerless grinding) when geometric calculations or workpiece positioning push the support point beyond configurable range boundaries.
Safety
- Spindle hazard: ensure the spindle is at standstill before working near it; follow lockout/tagout procedures.
Causes and Fixes
- 1
Access Siemens HMI > Diagnostic > Alarms > Archive and note the block number (%3) and spindle identifier (%2) from alarm 20211 message.
- 2
Navigate to NCK Parameters > Machine Data > Spindle Data (MD 21500-21599 range) and verify current values: MD 21518 (upper) and MD 21520 (lower). Document existing limits.
- 3
Review part program block (%3) in editor; calculate expected support point position based on workpiece diameter and grinding wheel geometry using TRACLG syntax.
- 4
Increase MD 21518 or decrease MD 21520 incrementally (e.g., ±5mm per adjustment) to accommodate calculated support point; verify range against physical machine stroke capability; re-execute NC block to confirm alarm clears.
Do not extend limits beyond actual machine mechanical range or collision will occur.
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