PLCXEMVerification pending — cross-check with the official manual
XEM E022 — Memory Backup Fail
Critical — power cycle required
CAUSE
Why does it occur?
Data backup failure
REMEDY · Step by step
How to fix it?
Replace battery
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
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