Cause : Power units with illegal code numbers comes when the code numbers of the power units are not permissible. For parallel circuit configurations, only power units with identical power unit data may be used.

Possible causes:
- The code numbers of the power units do not match. For booksize drive units, the following additionally applies:
- a parallel connection is not possible for the power units being used.
- there are too many power units being used in the parallel connection.

• Fault value (r0949, interpret decimal):
• Parameter in which the inadmissible power unit code number was detected.
• Use power units with the same code number.
• For booksize drive units, the following additionally applies:
  - use power units which are permitted for a parallel connection.
  - reduce the number of power units being used in the parallel connection.