# Maximum permissible percentage radius difference (P-CHAN-00172)

P-CHAN-00172 | Maximum permissible percentage radius difference during circle programming
Description | The parameter is used to specify the permissible radius difference for inactive circle centre point compensation (G164) with respect to the circle radius in per mill. If the relative radius difference of a programmed circle is below the limit value defined by the parameter, the circle radius is transferred linearly from the start radius to the target radius, otherwise, the error message ID 21758 is output.

If the parameter is unassigned, the default value applies.
If the value is set to 0, no radius difference is permitted.

The parameter P-CHAN-00171 must be included for the effectively active circle radius difference error.

Parameter | max_proz_radius_diff_circle
Data type | UNS32
Data range | 0 < max_proz_radius_diff_circle < 500
Dimension | 0.1%
Default value | 0.1
Remarks | P-CHAN-00172 is only effective in combination with G164 and the channel parameter P-CHAN-00171 . Parameterisation example: The percentage circle radius error may only be maximum 1%. Circle radius 100mm -> permissible relative circle radius difference 1mm.

max_proz_radius_diff_circle 10