PLCFX5UVerification pending — cross-check with the official manual
FX5U 4412H — Security function error
Warning — monitor
CAUSE
Why does it occur?
- • The security key cannot be registered to the CPU module due to failure of the internal memory where the security key is registered
- Or, the security key of the CPU module cannot be deleted
REMEDY · Step by step
How to fix it?
- • Hardware failure of the CPU module
- Replace the CPU module
Do not reset repeatedly before identifying the cause. Repeated resets while ignoring a trip/alarm can cause secondary damage (IGBT failure, motor winding damage, etc.).
SOURCE
Related manual page
Summary based on the official Mitsubishi Electric manual. For accurate and complete information, always consult the official manual.
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