344

Review the program lines immediately before the alarm. Identify the canned cycle block (G73, G76, G81-G89) and subsequent hole position calls.

Verify that the initial canned cycle block contains all required parameters: R (retract plane), Z (depth), F (feedrate), and Q (peck depth if applicable).

Check that subsequent hole positions either include all cycle parameters or that parameter setting 5101 bit 6 is set to allow single-axis specification. If bit is OFF, every cycle call must include R and Z values.

Modifying parameter 5101 affects all canned cycle operations. Consult machine builder documentation before changing.

Rewrite the canned cycle sequence with complete parameters on each line, or ensure the initial cycle properly establishes modal values: G81 X__ Y__ Z__ R__ F__ for first hole, then X__ Y__ for subsequent holes.

Search backward from the alarm point to locate the last active canned cycle command (G73, G74, G76, G81-G89). Check if G80 or program reset appears between that cycle and the alarm location.

If G80 was issued or the program restarted, insert a complete canned cycle definition with all parameters (G8X X__ Y__ Z__ R__ F__ Q__) before attempting to specify additional hole locations.

Verify the program structure does not use subprograms or jumps that skip the initial canned cycle definition. Trace program flow including M98 calls and GOTOs.

If using program restart or block search, ensure the restart point is at or before the complete canned cycle definition, not in the middle of a hole pattern.

Never restart a program mid-cycle without verifying modal conditions are properly established.

Examine the alarm line for Z-axis specification. In cycle repeat mode, Z should either match the original cycle depth or be omitted entirely unless redefining the complete cycle.

Check for plane selection commands (G17, G18, G19) within the canned cycle sequence. Plane must remain constant throughout the entire drilling pattern until G80 cancels the cycle.

Verify the R-plane value if specified in repeat lines. R must be at or above the Z-depth value. Confirm R > Z for proper retract positioning.

An R-plane below Z-depth will cause crashes or alarms. Always verify retract clearance.

Correct the program by removing conflicting axis data from repeat lines, keeping only X and Y positional changes, or provide a complete new cycle definition with all valid parameters.