CPU Down Error with Device Access Issue

What does 1001 mean?

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.

• 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.

Click steps to track your progress.

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.