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1001
CPU Down Error with Device Access Issue
Mitsubishi Electric · MELSEC System Q/L Series
¿Qué significa 1001 ?
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.
Causas comunes
- 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.
Pasos de reparación & Lista de verificación
Haga clic en los pasos para seguir su progreso.
- 1
Implement noise reduction measures for the control system environment.
- 2
Reset the CPU module and attempt to RUN it again.
- 3
If the same error is displayed again after resetting, diagnose for a CPU module hardware fault.
- 4
For Universal model QCPU, check devices specified by BMOV, FMOV, and DFMOV instructions and correct device settings.
Datos técnicos verificados. Última actualización: March 2026
Fallas relacionadas
Fuente: Mitsubishi Electric MELSEC System Q/L Series