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Locate the program block number shown in the alarm display and identify the move commands before and after the ,R specification.

Calculate the actual length of each line segment forming the corner using the coordinate differences between points.

Verify the ,R radius value does not exceed the shorter of the two line segments. As a rule, R should be less than 50% of the shortest segment length.

Reduce the ,R value to a smaller radius that fits within the geometric constraints and re-run the program.

Examine the alarmed block for proper ,R formatting. Correct syntax is a comma followed immediately by R and the radius value (e.g., G01 X100. Y50. ,R5.).

Verify there are no spaces between the comma and R, and that the radius value is a positive non-zero number with proper decimal formatting.

Check that the ,R command appears at the end of the G01 linear move block that approaches the corner, not on the block after the corner.

Correct any syntax errors, ensure proper placement, and verify the program in graphics mode before running.

Verify that the ,R command is only used with G01 linear interpolation blocks, not with G00, G02, or G03 commands.

Ensure there is a valid following G01 move block after the corner rounding command to define the second leg of the corner.

Check that corner rounding is not applied at program start, program end, or where there is no subsequent linear move to create a corner.

Remove ,R from incompatible blocks or restructure the program to use only G01 linear moves for corner rounding sequences.

Do not attempt to use corner rounding with rapid positioning moves as this may cause unexpected motion behavior.