What causes KUKA Robot alarm KRC0662?

A higher priority task has locked a resource needed by the current program. The target module or function was closed/terminated before the PRIO task could access it. Priority level mismatch between requesting task and available resources. Concurrent access conflict where multiple PRIO tasks compete for the same resource. System initialization incomplete or resource not properly allocated before PRIO execution.

How do I fix KUKA Robot alarm KRC0662?

1. Check the program logic and verify PRIO task scheduling and resource dependencies 2. Review the priority levels assigned to conflicting tasks and reorder execution sequence if necessary 3. Ensure all required modules and functions are properly initialized and opened before PRIO execution 4. Examine the complete call stack to identify which object is blocked and why it is closed 5. Verify that no higher-priority background tasks are holding locks on required resources 6. Restart the KRC controller and reload the program to reset resource states and priority queues

KUKA Robot codes

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KUKA Robot Controller

System · Basic

Alarm KRC0662

KUKA Robot KRC0662 - “PRIO” 4080 CLOSED 1616

This alarm indicates a priority-based resource conflict where a process or module marked as PRIO (priority) has encountered a closed or unavailable resource at priority level 4080, with internal error code 1616. The system has detected an attempt to access a locked or terminated object that cannot be executed at the requested priority level.

KUKA RobotSystemBasic

KRC0662

KUKA Robot KRC0662 - “PRIO” 4080 CLOSED 1616

“PRIO” 4080 CLOSED 1616

Common Causes

A higher priority task has locked a resource needed by the current program
The target module or function was closed/terminated before the PRIO task could access it
Priority level mismatch between requesting task and available resources
Concurrent access conflict where multiple PRIO tasks compete for the same resource
System initialization incomplete or resource not properly allocated before PRIO execution

Troubleshooting Steps

1Check the program logic and verify PRIO task scheduling and resource dependencies
2Review the priority levels assigned to conflicting tasks and reorder execution sequence if necessary
3Ensure all required modules and functions are properly initialized and opened before PRIO execution
4Examine the complete call stack to identify which object is blocked and why it is closed
5Verify that no higher-priority background tasks are holding locks on required resources
6Restart the KRC controller and reload the program to reset resource states and priority queues

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