A259.12

Task Error

Omron · SYSMAC CJ2 CPU Unit

What does A259.12 mean?

This flag indicates a general Task Error. This occurs when an unspecified error is detected during the execution of a program task within the CPU. This can encompass a range of runtime issues.

Common Causes

  • Uncaught runtime error within a specific program task (e.g., division by zero, null pointer dereference, out-of-bounds array access).
  • Task scheduling conflicts or resource contention issues.
  • External interrupt or event handler failure within a task context.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Isolate the program task where the error occurs and meticulously debug its logic, focusing on data manipulation and control flow.

  2. 2

    Check task execution order and priorities in the PLC setup to identify potential conflicts or deadlocks.

  3. 3

    Enable detailed error logging for the specific task if available to gain more insight into the runtime fault.

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Verified technical data. Last updated: March 2026

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