What causes Siemens SINUMERIK alarm 61912?

Parameter configuration error in the machine data for the affected axis or channel. Hardware fault on the axis drive or control module. Incorrect axis assignment or configuration in the SINUMERIK machine data. Software or firmware version incompatibility. Communication fault between NC and drive system.

How do I fix Siemens SINUMERIK alarm 61912?

1. Check the SINUMERIK alarm list for any sub-alarms or related alarms active at the same time. 2. Review the machine data parameters referenced in the alarm description for the affected axis. 3. Power cycle the machine to reset transient faults. 4. Check the SINAMICS drive diagnostics for the affected axis. 5. Consult the Siemens SINUMERIK alarm manual for alarm 61912 for detailed remedy instructions.

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Siemens SINUMERIK Controller

Servo/Axis · Intermediate · 30-120 minutes

Alarm 61912

Siemens 840D 61912 - Channel block: No path to generate

Alarm 61912 indicates the NCK cannot generate a valid tool path geometry for the specified block due to mathematical impossibility or constraint violations in the programmed motion. This occurs when interpolation parameters, axis limits, or kinematic constraints prevent path generation between the current and target positions.

Siemens SINUMERIKServo/AxisIntermediate30-120 minutes

61912

Siemens 840D 61912 - Channel block: No path to generate

Channel block: No path to generate

Root Cause Summary

Alarm 61912 indicates the NCK cannot generate a valid tool path geometry for the specified block due to mathematical impossibility or constraint violations in the programmed motion. This occurs when interpolation parameters, axis limits, or kinematic constraints prevent path generation between the current and target positions.

Safety

Refer to Siemens documentation
Ensure qualified technician performs repairs

Causes and Fixes

1
Review the NC program block listed in alarm (%2). Check for G02/G03 arc commands with I/J/K parameters where the calculated radius does not match the endpoint geometry.
Use SINUMERIK Operate panel Diagnostics > Program > Block Info to display parsed block parameters and interpolator state.
2
Verify spline blocks (BSPLINE, NURBSPLINE) contain sufficient definition points and valid degree/knot vectors. Check parameter MD30240 (InterpolationMethod) and MD30250 (SplineCheckTolerance).
3
For contour path commands with tangency constraints, validate that feed rates and axis limits allow smooth transition. Review MD32100 (MaxPathVelocity) and relevant axis velocity parameters (MD32110-MD32130).

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