Siemens SINUMERIK codes
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Siemens SINUMERIK Controller

Servo/Axis · Intermediate · 20-40 minutes

Alarm 12170

Siemens 840D 12170 - Channel block identifier defined repeatedly

The symbol shown in the error message has already been defined in the active part program. Note that user-defined identifiers may occur more than once if the multiple definition occurs in other (sub)programs, i.e. local variables may be redefined with the same name if the program has been exited (su

Siemens SINUMERIKServo/AxisIntermediate20-40 minutes

12170

Siemens 840D 12170 - Channel block identifier defined repeatedly

Channel block identifier defined repeatedly

The symbol shown in the error message has already been defined in the active part program. Note that user-defined identifiers may occur more than once if the multiple definition occurs in other (sub)programs, i.e. local variables may be redefined with the same name if the program has been exited (su

Safety

  • Refer to Siemens documentation
  • Ensure qualified technician performs repairs

Common Causes

  • Duplicate identifier declaration in the same program block or scope
  • Global variable redefined without proper scope management or local variable handling
  • Subroutine or subprogram variables not properly isolated from parent program namespace
  • Copy-paste programming error creating duplicate symbol definitions
  • Incomplete program editing or merge leaving duplicate declarations

Troubleshooting Steps

  1. 1Review the part program at the specified block number and identify the duplicate identifier mentioned in the error message
  2. 2Search the entire active program and all called subprograms for all instances of the duplicate identifier to locate where it is first and second defined
  3. 3Verify scope rules: confirm whether the identifier should be local (redefinable in subprograms) or global (single definition only)
  4. 4Remove or rename the duplicate identifier declaration, ensuring variable names are unique within their required scope
  5. 5Verify subprogram structure and ensure local variables are properly contained within their respective subprogram scope before restarting the program

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