What causes Siemens SINUMERIK alarm 12240?

Multiple tool orientation definitions in same NC block (e.g., both Euler angles and axis endpoints specified). Direction vectors combined with Euler angles in single block. Redundant orientation syntax from CAM post-processor error. Manual programming error with mixed orientation formats. Copied block containing multiple orientation statements without cleanup.

How do I fix Siemens SINUMERIK alarm 12240?

1. Review the NC code at the specified block number and identify all tool orientation definitions present in that single block 2. Verify which orientation method is required: Euler angles (A2, B2, C2), axis endpoints, or direction vectors (e.g., VECTOR statement) 3. Remove redundant orientation definitions, keeping only one method per block; move additional orientations to separate subsequent blocks if needed 4. Check CAM post-processor settings for tool orientation output and correct any configuration causing multiple statements per block 5. Verify syntax matches machine kinematics documentation and test modified program with dry run before production

Siemens SINUMERIK codes

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Siemens SINUMERIK Controller

Servo/Axis · Intermediate · 20-45 minutes

Alarm 12240

Siemens 840D 12240 - Channel block tool orientation defined repeatedly

Only 1 tool orientation can be programmed per DIN block. This can either be defined via the 3 Euler angles, or the end points of the axes, or through direction vectors.

Siemens SINUMERIKServo/AxisIntermediate20-45 minutes

12240

Siemens 840D 12240 - Channel block tool orientation defined repeatedly

Channel block tool orientation defined repeatedly

Only 1 tool orientation can be programmed per DIN block. This can either be defined via the 3 Euler angles, or the end points of the axes, or through direction vectors.

Safety

Refer to Siemens documentation
Ensure qualified technician performs repairs

Common Causes

Multiple tool orientation definitions in same NC block (e.g., both Euler angles and axis endpoints specified)
Direction vectors combined with Euler angles in single block
Redundant orientation syntax from CAM post-processor error
Manual programming error with mixed orientation formats
Copied block containing multiple orientation statements without cleanup

Troubleshooting Steps

1Review the NC code at the specified block number and identify all tool orientation definitions present in that single block
2Verify which orientation method is required: Euler angles (A2, B2, C2), axis endpoints, or direction vectors (e.g., VECTOR statement)
3Remove redundant orientation definitions, keeping only one method per block; move additional orientations to separate subsequent blocks if needed
4Check CAM post-processor settings for tool orientation output and correct any configuration causing multiple statements per block
5Verify syntax matches machine kinematics documentation and test modified program with dry run before production

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