Cause : Toggle abnormality error comes when a toggle abnormality monitoring error occurred. This error suggests that the drive has detected an inconsistency or malfunction in how a toggle function or related input is behaving.

"ArF" fault in Fuji FRENIC-VG drive indicate "Toggle abnormality error". This means an issue related to the toggle function or operation, which may involve input signals or control logic within the drive. 

• Check if the CPU of the host PLC is stopped.