246

Identify the exact line number where alarm 246 occurred by checking the control's alarm history or program position display.

Review the flagged program line for syntax errors such as missing decimal points, invalid address letters, out-of-range values, or unsupported G/M codes for your specific control model.

Cross-reference the command against the Fanuc programming manual for your specific control series (0i, 16i, 31i, etc.) to verify proper syntax and parameter ranges.

Correct the program line with proper syntax or replace unsupported codes with valid alternatives, then reset the alarm and restart the program.

Always dry-run or single-block execute modified programs to verify corrections before automatic operation.

Locate the program block containing the macro command or variable operation where the alarm occurred.

Check for common macro errors: undefined variables (#0 or uninitialized variables), division by zero operations, excessive nesting depth (IF/WHILE statements), or missing GOTO destinations.

Verify all macro variable numbers are within the valid range for your control (typically #1-#999 for common variables, #100-#999 for user-accessible range) and properly assigned before use.

Test the macro logic by adding debug output using DPRNT or alarm messages, or simplify complex calculations into multiple steps to isolate the error condition.

Macro errors can be intermittent based on variable values; test with actual production values and edge cases.

Check if the program line contains work offset commands (G54-G59.3) or external work offset numbers and verify these offsets are properly registered in the control's offset tables.

Review parameters 1220-1227 to confirm the number of available work coordinate systems matches the program requirements, especially for extended offsets (G54.1 P1-P48).

Modifying coordinate system parameters requires machine manufacturer authorization and may affect other programs.

Verify that G52 local coordinate system or G92 coordinate system setting commands have valid numerical values and are not attempting to set positions beyond machine travel limits.

If using programmable offset changes (G10 L2), confirm the P-address specifies a valid offset number and all axis values are within allowable ranges per machine parameters.