Siemens SINUMERIK codes
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Siemens SINUMERIK Controller

Servo/Axis · Intermediate · 20-45 minutes

Alarm 12290

Siemens 840D 12290 - Channel block arithmetic variable not defined

Only the R parameters are predefined as arithmetic variables. All other arithmetic variables must be defined with the DEF instruction before being used. The number of arithmetic parameters is defined via machine data. The names must be unambiguous and may not be repeated in the control (exception: l

Siemens SINUMERIKServo/AxisIntermediate20-45 minutes

12290

Siemens 840D 12290 - Channel block arithmetic variable not defined

Channel block arithmetic variable not defined

Only the R parameters are predefined as arithmetic variables. All other arithmetic variables must be defined with the DEF instruction before being used. The number of arithmetic parameters is defined via machine data. The names must be unambiguous and may not be repeated in the control (exception: l

Safety

  • Refer to Siemens documentation
  • Ensure qualified technician performs repairs

Common Causes

  • Arithmetic variable referenced in NC program without prior DEF instruction definition
  • Variable name conflicts or duplicate definitions in control memory or macro files
  • Incorrect variable naming convention or typo in variable reference
  • Machine data configuration limits number of available arithmetic variables exceeded
  • Carryover of undefined variables from previously loaded program or macro

Troubleshooting Steps

  1. 1Review the NC program at the specified block number and identify the undefined arithmetic variable name
  2. 2Search entire program and any called macros for DEF instruction defining the variable; add DEF statement before first use if missing
  3. 3Verify variable name spelling and syntax matches the DEF declaration exactly, checking for case sensitivity and special characters
  4. 4Check machine data settings for arithmetic variable allocation limits; verify current program does not exceed configured maximum variables
  5. 5Clear control memory or reload program from source to eliminate potential variable state conflicts from previous runs

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