Siemens SINUMERIK codes
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Siemens SINUMERIK Controller

Servo/Axis · Basic · 10-20 minutes

Alarm 15460

Siemens 840D 15460 - Channel block syntax error with modal function

The addresses programmed in the block are not compatible with the modal syntax-determining G function. Example: N100 G01. I. J. K. LF

Siemens SINUMERIKServo/AxisBasic10-20 minutes

15460

Siemens 840D 15460 - Channel block syntax error with modal function

Channel block syntax error with modal function

The addresses programmed in the block are not compatible with the modal syntax-determining G function. Example: N100 G01. I. J. K. LF

Safety

  • Refer to Siemens documentation
  • Ensure qualified technician performs repairs

Common Causes

  • G01 (linear interpolation) programmed with arc-specific parameters (I, J, K) which are only valid for G02/G03
  • Mixing incompatible modal functions in same block or carried over from previous block
  • Incorrect parameter syntax for the active G function mode
  • G-code post-processor error generating invalid parameter combinations
  • Manual programming error combining linear motion syntax with circular interpolation addresses

Troubleshooting Steps

  1. 1Review the NC program at the indicated block number and identify which G function is active (G01, G02, G03, etc.)
  2. 2Check for arc parameters (I, J, K) in blocks with linear functions (G01) or rapid moves (G00) and remove them
  3. 3Verify the G-code was generated correctly if using CAM software; regenerate and post-process the program
  4. 4Confirm modal state from previous blocks - arc parameters may be carried over; insert explicit G01 or G00 to clear modal arc state
  5. 5Test the corrected program by running a dry cycle before resuming production

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Always verify with your machine manual or a certified technician before performing service procedures.