1124

Navigate to EDIT mode and display the macro program that generated the alarm. Press SYSTEM > ALARM to confirm the O-number and line number where alarm occurred.

Search backward from the END statement to locate the corresponding DO statement. Count nested DO-END pairs to ensure proper pairing (each DO must have exactly one END).

If DO statement is missing, insert the proper DO statement with correct loop counter format: DO#i=#j,#k,#m (where #i=loop variable, #j=start value, #k=end value, #m=increment).

Reset alarm (RESET key), verify macro syntax using MDI test call (G65 P####), and confirm proper execution with single block and dry run enabled.

Review the entire macro program structure and identify all DO-END pairs. Use paper or notepad to manually trace each DO with its matching END, numbering nested levels (DO1-END1, DO2-END2, etc.).

Verify that inner nested loops are completely contained within outer loops. Check that no GOTO or M99 statements jump out of loops without proper END closure.

Correct the nesting structure by repositioning END statements or adding missing END statements for inner loops. Ensure each DO has its dedicated END before any outer loop's END.

Test the corrected macro incrementally by temporarily disabling outer loops (comment out outer DO-END) and testing inner loops first, then progressively enabling outer nesting levels.

Examine all GOTO statements, IF-THEN conditionals (IF[#i EQ #j]GOTO), and sequence number labels (N-codes) in the macro program. Trace potential execution paths that could bypass DO statements.

Verify that no GOTO target label (N-code) exists between a DO statement and its body, which would allow jumping into the middle of a loop structure. All loop entries must pass through the DO statement.

Restructure conditional logic to ensure DO statements are never bypassed. Place GOTO targets outside of DO-END structures or use IF-THEN to conditionally execute the entire DO-END block as a unit.

Clear alarm with RESET, validate program flow using parameter 3117 bit 1 (macro statement display) if available on your control, and test all conditional branches with different macro variable values.

Parameter 3117 bit 1 requires power cycle to take effect on some Fanuc series