14751

Common Causes

• Machine data parameters $MC_MM_IPO_BUFFER_SIZE, $MC_MM_NUM_BLOCKS_IN_PREP, $MC_MM_NUM_SAFE_SYNC_ELEMENTS, or $MC_MM_NUM_SYNC_ELEMENTS configured too low for program complexity
• Part program contains excessive motion synchronous actions (WAITM, WHEN/DO, M-function synchronization) exceeding configured buffer capacity
• Rapid successive synchronous commands without adequate resource allocation in machine data
• Incompatible machine data configuration after system update or parameter reset
• Memory allocation conflict from overlapping synchronous element definitions

Troubleshooting Steps

1. 1Review the part program at block %2 in channel %1 to identify the specific motion synchronous action causing resource exhaustion
2. 2Access machine data editor and verify current values for $MC_MM_IPO_BUFFER_SIZE, $MC_MM_NUM_BLOCKS_IN_PREP, $MC_MM_NUM_SAFE_SYNC_ELEMENTS, and $MC_MM_NUM_SYNC_ELEMENTS against machine specifications and program requirements
3. 3Incrementally increase insufficient machine data parameters by 10-20% and test with problematic program block to determine adequate resource levels
4. 4Check system logs and alarm history to identify if configuration changed recently or if alarm correlates with program modifications
5. 5If issue persists after parameter adjustment, verify no syntax errors in WAITM or synchronous M-function declarations and consider simplifying synchronous action sequence in the part program