234

Review the part program at the line number indicated in the alarm. Identify the G31 skip block and any G-codes in the same block or immediately following blocks.

Check for prohibited commands such as G28/G30 (reference return), G52/G53 (work coordinate changes), G65/G66 (macro calls), or canned cycles (G73-G89) within or immediately after the G31 block.

Separate the G31 skip command from the prohibited G-code by placing them in different blocks. Insert the skip function, then program the next operation in a subsequent block after skip completion.

Verify the program logic ensures the G31 skip completes and the control returns to normal motion mode before executing additional G-code commands. Test the modified program in single block mode.

Always verify probe or skip clearances after program modifications to prevent workpiece or probe damage.

Search the program for multiple G31 commands in consecutive blocks or within macro/subprogram calls that may be active during another skip operation.

Verify that each G31 skip function completes fully (skip signal received or block endpoint reached) before the next skip command is initiated.

If using subprograms (M98) or macros (G65) that contain skip functions, ensure they are not called from within an active G31 block. Restructure the program to call routines only between skip operations.

Add intermediate positioning moves (G00/G01) between skip operations to allow the control to complete the previous skip cycle and reset internal skip flags before beginning the next operation.

Ensure adequate clearance moves between probing operations to prevent accidental contact.

Examine the program for G43/G44 (tool length compensation), G54-G59 (work coordinate selection), or G68/G69 (coordinate rotation) commands in the same block as G31 or in blocks immediately following skip commands.

Move all coordinate system setup commands, tool length compensation activation, and rotation commands to program blocks that execute before the G31 skip function is initiated.

Ensure work coordinate systems and tool offsets are fully established and stable before entering any skip operation. Verify this by reviewing program initialization blocks (typically near program start).

If coordinate changes are necessary after probing, program them in a separate block following the G31 operation with at least one intermediate motion command to allow skip cycle completion.

Changing coordinate systems immediately after probing may affect measured position values; store skip positions (#5061-#5065) before making coordinate changes.