State of the rectifier module. It is an enumeration type: If the enumeration value is 1, it indicates that the rectifier module is in the normal state; If the enumeration value is 2, it indicates that a fault occurs on the rectifier module; If the enumeration value is 3, it indicates the automatic protection of the rectifier module; If the enumeration value is 4, it indicates that communication of the rectifier module fails; If the enumeration value is 5, it indicates that the rectifier module is shut down; If the enumeration value is 6, it indicates that the rectifier module is invalid; If the enumeration value is 7, it indicates that this rectifier is not configured; If the enumeration value is 254, it indicates rectifier alarm resume; If the enumeration value is 255, it indicates rectifier operation status unknown.