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ErrorLib — Industrial Fault Code Library

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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.

Browse all codes in this manual (27)
Verified technical data. Last updated: April 2026

Related Faults

A10101Synchronous Input Data Refresh ErrorA295.09Indirect DM/EM Addressing ErrorA295.10Illegal Area Access Error
Source: Omron SYSMAC CJ2 CPU Unit
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