2400

File Set Error (Boot Setting)

Mitsubishi Electric · MELSEC-Q/L Common Instruction

What does 2400 mean?

This error occurs when the boot setting has not been configured in the PLC parameter, preventing the execution of a program replaced by the PSWAPP instruction. The system expects a program to be designated for boot. This ultimately prevents the newly swapped program from running, indicating a missing or incorrect system configuration for program execution.

Common Causes

  • The PLC parameter's boot setting is not configured for a specific program name.
  • Attempting to execute a program swapped by the PSWAPP instruction without a corresponding boot setting in PLC parameters.
  • The program setting in the PLC parameter for the corresponding program name is incorrect or undefined.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Access the PLC parameters via the programming software.

  2. 2

    Configure the boot setting in the PLC parameter to the program name intended for execution.

  3. 3

    If the program setting in the PLC parameter is also incorrect, update it for the corresponding program name.

  4. 4

    If the program was recently modified or transferred, write the correct program to the CPU module again after adjusting boot and program settings.

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Verified technical data. Last updated: March 2026

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Source: Mitsubishi Electric MELSEC-Q/L Common Instruction