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4121

SP.CONTSW Instruction Executed in Incorrect Mode

Mitsubishi Electric · MELSEC-Q/L Common Instruction

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This error occurs if the SP.CONTSW instruction was executed by the standby system CPU module while operating in separate mode or if the instruction was executed when the CPU was in debug mode. Both scenarios represent prohibited conditions for performing system switching, preventing the instruction from completing successfully.

Häufige Ursachen

  • SP.CONTSW instruction executed by the standby system CPU module in separate mode.
  • SP.CONTSW instruction executed in debug mode.

Reparaturschritte & Checkliste

Klicken Sie auf Schritte, um Ihren Fortschritt zu verfolgen.

  1. 1

    Verify the operating mode of the standby system CPU module. Ensure it is not in separate mode during SP.CONTSW instruction execution.

  2. 2

    Verify the operating mode of the CPU module. Ensure the system is not in debug mode when the SP.CONTSW instruction is executed.

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Verifizierte technische Daten. Zuletzt aktualisiert: March 2026

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Quelle: Mitsubishi Electric MELSEC-Q/L Common Instruction