PLCFX5UVerification pending — cross-check with the official manual
FX5U 4000H — Common error
Warning — monitor
CAUSE
Why does it occur?
• Serial communication sum check error.
REMEDY · Step by step
How to fix it?
• Connect the serial communication cable correctly. • Take measures to reduce noise.
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.