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FANUC Robot Controller
System · Intermediate · 15-60 minutes
Fanuc Robot SYST-010 - Max num task reached
SYST-010 occurs when the R-30iA/R-30iB controller exceeds its maximum concurrent task limit (typically 10-15 tasks depending on controller configuration and software options). This alarm indicates that TP programs, Karel programs, or background logic tasks have accumulated beyond the system's capacity, preventing new task execution until existing tasks are terminated or complete naturally.
SYST-010
Fanuc Robot SYST-010 - Max num task reached
Max num task reached
The maximum number of simultaneously running tasks has been reached. The robot controller cannot start an additional background task or Karel program.
Root Cause Summary
SYST-010 occurs when the R-30iA/R-30iB controller exceeds its maximum concurrent task limit (typically 10-15 tasks depending on controller configuration and software options). This alarm indicates that TP programs, Karel programs, or background logic tasks have accumulated beyond the system's capacity, preventing new task execution until existing tasks are terminated or complete naturally.
Safety
- Always verify robot is in a safe stopped state before entering the work envelope
- Use T1 mode when testing after clearing servo or motion alarms
Causes and Fixes
- 1
Access task manager and identify all active tasks
Press MENU > STATUS > Program > [SHOW] (F1 key) > Task. This displays all currently running tasks with their status. Look for task counts approaching 10-15 simultaneous entries. Note any tasks showing 'Running' status that should have completed.
Press F5 [DETAIL] on any task entry to see the program name, line number, and parent task relationship. This helps identify which main program is spawning multiple children.
- 2
Check for programs using RUN vs CALL instructions
Review your main cycle programs for RUN instructions. RUN starts programs as independent background tasks that persist even after the calling program ends. Navigate to the program and search for 'RUN' statements. Replace with CALL where sequential execution is acceptable.
Use MENU > SELECT > [FIND] (F5) and search for 'RUN' across all programs to quickly locate potential task spawning instructions.
- 3
Verify Karel program termination logic
Karel programs without proper termination conditions will remain in task list indefinitely. Check Karel source code for WHILE TRUE loops without break conditions or programs waiting on conditions that may never occur. Ensure all Karel programs have definitive END_PROG statements or ABORT_TASK calls.
Karel programs launched with RUN_TASK from TP programs are particularly prone to accumulation. Always implement timeout logic or completion flags in Karel background tasks.
- 4
Force terminate hung or unnecessary tasks
From MENU > STATUS > Program > Task display, highlight the unwanted task and press F2 [ABORT]. This immediately terminates the task and frees the slot. Abort tasks starting from child tasks upward to parent tasks to avoid orphaned processes.
Aborting tasks during active motion or I/O operations may leave the system in an unexpected state. Ensure robot is in a safe hold condition before aborting production tasks.
- 5
Review and optimize program architecture
Implement a state machine architecture where one main program controls flow and calls subroutines sequentially rather than spawning multiple concurrent tasks. Use PAUSE conditions and flags instead of multiple simultaneous programs monitoring conditions.
For applications requiring true background monitoring, limit to 2-3 essential Karel background tasks and use shared Position Registers or Flags for communication instead of spawning additional TP programs.
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