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CPU Down Error with Device Access Issue

Mitsubishi Electric · MELSEC System Q/L Series

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The CPU module has experienced a runaway condition or failure, potentially due to electrical noise, a hardware fault, or (for Universal model QCPU) accessing outlying devices with device range checks disabled (SM237 = 1) during BMOV, FMOV, or DFMOV instruction execution. This error specifically affects QCPU and LCPU modules.

Häufige Ursachen

  • Runaway or failure of CPU module.
  • Malfunctioning due to noise or other external reasons.
  • Hardware fault within the CPU module.
  • Universal model QCPU accessed outlying devices with device range checks disabled (SM237 = 1) during BMOV, FMOV, or DFMOV instruction execution.

Reparaturschritte & Checkliste

Klicken Sie auf Schritte, um Ihren Fortschritt zu verfolgen.

  1. 1

    Implement noise reduction measures for the control system environment.

  2. 2

    Reset the CPU module and attempt to RUN it again.

  3. 3

    If the same error is displayed again after resetting, diagnose for a CPU module hardware fault.

  4. 4

    For Universal model QCPU, check devices specified by BMOV, FMOV, and DFMOV instructions and correct device settings.

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Verifizierte technische Daten. Zuletzt aktualisiert: March 2026

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Quelle: Mitsubishi Electric MELSEC System Q/L Series