Siemens SINUMERIK codes
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Siemens SINUMERIK Controller

Servo/Axis · Intermediate · 30-45 minutes

Alarm 14120

Siemens 840D 14120 - Channel block plane determination for programmed orientation

The programmed orientation vectors (direction vectors) in the beginning of block and end of block point include an angle of 180 degrees. Therefore the interpolation plane cannot be determined. Example: N50 TRAORI (1) N55 A3=0 B3=0 C3=1 N60 A3=0 B3=0 C3=-1; the vector of this block is precisely oppo

Siemens SINUMERIKServo/AxisIntermediate30-45 minutes

14120

Siemens 840D 14120 - Channel block plane determination for programmed orientation

Channel block plane determination for programmed orientation

The programmed orientation vectors (direction vectors) in the beginning of block and end of block point include an angle of 180 degrees. Therefore the interpolation plane cannot be determined. Example: N50 TRAORI (1) N55 A3=0 B3=0 C3=1 N60 A3=0 B3=0 C3=-1; the vector of this block is precisely oppo

Safety

  • Refer to Siemens documentation
  • Ensure qualified technician performs repairs

Common Causes

  • Programmed orientation vectors (A3, B3, C3) at block start and end differ by 180 degrees
  • Contradictory direction vectors specified in TRAORI blocks causing ambiguous plane definition
  • Incorrect vector calculation in CAM output resulting in opposite normal vectors
  • Manual G-code entry with inverted orientation vectors between consecutive blocks

Troubleshooting Steps

  1. 1Review the NC program around the specified block number and verify orientation vectors (A3, B3, C3) at block start and end do not point in opposite directions
  2. 2Recalculate or regenerate the CAM program to ensure continuous orientation vectors without 180-degree inversions between blocks
  3. 3Modify the program to introduce a transitional block with intermediate orientation vector if a tool orientation change is required
  4. 4Verify TRAORI parameters and orientation mode match the intended machining operation and geometric requirements
  5. 5Test the corrected program in simulation mode before resuming machine execution

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