21760

Common Causes

• More than the maximum permissible auxiliary functions (M, H, or D codes) programmed in a single block
• Motion synchronous actions combined with auxiliary functions exceeding system limits
• Programming error where multiple auxiliary functions were stacked in one NC block without distribution across blocks
• Custom macro or subroutine generating excessive auxiliary function calls in a single motion block

Troubleshooting Steps

1. 1Review the NC program at the specified channel and block number to identify all programmed auxiliary functions (M, H, D codes)
2. 2Redistribute auxiliary functions across multiple sequential blocks, placing only the maximum permissible number per block
3. 3If motion synchronous actions are present, verify they do not combine with auxiliary functions to exceed limits; consider separating them into non-motion blocks
4. 4Consult the machine builder documentation for the specific auxiliary function limit configured for this control
5. 5Recompile and reload the corrected program, then verify proper execution without alarm recurrence