Siemens SINUMERIK codes
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Siemens SINUMERIK Controller

Servo/Axis · Intermediate · 30-60 minutes

Alarm 12580

Siemens 840D 12580 - Channel block not permissible for assignment in motion

The variable displayed must not be written in a motion synchronous action. Only selected variables are permitted here, e.g. DO $AA_IW[X]=10 is not allowed.

Siemens SINUMERIKServo/AxisIntermediate30-60 minutes

12580

Siemens 840D 12580 - Channel block not permissible for assignment in motion

Channel block not permissible for assignment in motion

The variable displayed must not be written in a motion synchronous action. Only selected variables are permitted here, e.g. DO $AA_IW[X]=10 is not allowed.

Safety

  • Refer to Siemens documentation
  • Ensure qualified technician performs repairs

Common Causes

  • Attempting to assign values to non-permitted variable types in motion synchronous blocks
  • Using input variables (IW) or other protected parameters in DO statements during active motion
  • Incorrect syntax or variable selection in motion-synchronized actions
  • Program logic error where assignment operation conflicts with simultaneous axis movement
  • Mixing incompatible variable types in motion synchronous context without proper synchronization mechanism

Troubleshooting Steps

  1. 1Review the program code at the indicated channel and block number to identify the problematic variable assignment
  2. 2Verify that only motion-permissible variables are being written in DO statements during active motion execution
  3. 3Consult the Siemens 840D/828D programming manual to confirm which variable types are permitted in motion synchronous actions
  4. 4Refactor the program to move non-permissible variable assignments outside of motion synchronous blocks or use alternative synchronization methods
  5. 5Test the corrected program on the CNC with motion validation enabled to confirm the alarm clears

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