Siemens SINUMERIK codes
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Siemens SINUMERIK Controller

Servo/Axis · Intermediate · 30-45 minutes

Alarm 12470

Siemens 840D 12470 - Channel block G function is unknown

With indirectly programmed G functions, an invalid or non-allowed group number has been programmed. Allowed group number = 1. and 5 max. number of G groups. In the displayed block, a non-defined G function has been programmed. Only "real" G functions are checked, which begin with the address G, e.g.

Siemens SINUMERIKServo/AxisIntermediate30-45 minutes

12470

Siemens 840D 12470 - Channel block G function is unknown

Channel block G function is unknown

With indirectly programmed G functions, an invalid or non-allowed group number has been programmed. Allowed group number = 1. and 5 max. number of G groups. In the displayed block, a non-defined G function has been programmed. Only "real" G functions are checked, which begin with the address G, e.g.

Safety

  • Refer to Siemens documentation
  • Ensure qualified technician performs repairs

Common Causes

  • Invalid G function group number programmed (only groups 1 and 5 are allowed for indirect G functions)
  • Non-existent or unsupported G code used in the NC program
  • Syntax error in G function declaration or indirect programming structure
  • G function exceeds maximum of 5 groups defined in machine configuration
  • Corrupted or incorrectly formatted G function parameter in program block

Troubleshooting Steps

  1. 1Review the NC program at the specified block and channel; verify all G functions start with address G and use only allowed group numbers (1 or 5)
  2. 2Check machine tool documentation and control parameter settings to confirm which G functions are supported and properly defined in the configuration
  3. 3If using indirect G function programming, validate that group numbers do not exceed the configured maximum and conform to allowed values
  4. 4Verify NC program syntax and correct any malformed G function statements; re-upload corrected program and attempt cycle restart
  5. 5Contact Siemens support or machine builder if G function support appears correct but alarm persists; may require parameter adjustment or software update

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