PLCFX5UVerification pending — cross-check with the official manual
FX5U 4D40H — Firmware update function error (Via engineering tool)
Warning — monitor
CAUSE
Why does it occur?
• Access to the flash ROM of the module to be updated has failed.
REMEDY · Step by step
How to fix it?
• Perform the firmware update to the target module again.
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.
Open official manual ↗CALLBACK
Request an expert callback
A 12-year automation/SI engineer responds directly. Reply within 1–3 business days.