What causes Siemens SINUMERIK alarm 27024?

Parameter or machine data configuration error. Hardware fault on the NC or drive component. Part program error or illegal command. Communication fault between NC and drive or I/O modules. Software or firmware error requiring system restart.

How do I fix Siemens SINUMERIK alarm 27024?

1. Note the complete alarm text including any axis, channel, or block number values. 2. Check for related alarms active simultaneously in the SINUMERIK alarm list. 3. Power cycle the machine to clear transient faults. 4. Review the SINUMERIK machine data for parameters related to the alarm. 5. Consult the Siemens SINUMERIK alarm manual for alarm 27024 detailed remedy.

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Siemens SINUMERIK Controller

Servo/Axis · Intermediate · 30-120 minutes

Alarm 27024

Siemens 840D 27024 - Axis stop A triggered

Alarm 27024 (Stop A triggered) is a safety-critical alarm that activates when the NCK detects a cascading safety event, typically following Safe Velocity Exceeded (27011) or Safe Braking Ramp Exceeded (27013). This alarm indicates the axis has entered an emergency stop state due to safety threshold violations configured in $MA_SAFE_VELO_STOP_MODE and related machine data parameters.

Siemens SINUMERIKServo/AxisIntermediate30-120 minutes

27024

Siemens 840D 27024 - Axis stop A triggered

Axis stop A triggered

Root Cause Summary

Alarm 27024 (Stop A triggered) is a safety-critical alarm that activates when the NCK detects a cascading safety event, typically following Safe Velocity Exceeded (27011) or Safe Braking Ramp Exceeded (27013). This alarm indicates the axis has entered an emergency stop state due to safety threshold violations configured in $MA_SAFE_VELO_STOP_MODE and related machine data parameters.

Safety

Refer to Siemens documentation
Ensure qualified technician performs repairs

Causes and Fixes

1
In Siemens HMI, navigate to Diagnosis > Alarms > Archive and note the timestamp sequence of Alarm 27011 preceding 27024.
2
Check machine data: MD 33000 $MA_SAFE_VELO_LIMIT (per axis) and MD 33080 $MA_SAFE_VELO_STOP_MODE. Verify the safe velocity threshold is appropriate for the axis load and servo tuning.
Do not modify safety-related MD without SIL certification review.
3
Verify servo loop gain (MD 32100 $MA_GAIN_FACTOR) and axis acceleration (MD 30100 $MA_ACCEL) are not causing overshoot that violates the safe velocity window.
4
Review NC program for rapid axis movements (G00, G01 with high feed rate) near the safety limit and validate Feed Override settings in operator panel.

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