# Maximum permissible absolute radius difference (P-CHAN-00171)

P-CHAN-00171 | Maximum permissible absolute radius difference during circle programming
Description | The parameter is used to specify the permissible absolute radius difference for inactive circle centre point compensation (G164) of circle radii between the start point and target point. If the 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 Maximum permissible percentage radius difference (P-CHAN-00172) must be included for the percentage circle radius difference error.

Parameter | max_radius_diff_circle
Data type | UNS32
Data range | 0 < max_radius_diff_circle < 10000
Dimension | 0.1µm
Default value | 50
Remarks | CHAN-00171 is only active only when circle centre point compensation is inactive (G164). Parameterisation example: The circle radius error may be 0.01 mm. max_radius_diff_circle 100