This signal turns on if a battery alarm has occurred in the
robot or robot controller.
The battery alarm detects all encoders of axis 1 to axis 4 and
axis 6 and battery level in the main control board (X8YV).
This signal can always be used, irrespective of the master
mode selected by means of the MODE switch.
If the battery alarm has occurred, replace the battery
immediately by identifying a battery whose voltage has
dropped according to the alarm code indicated as an error and
referring to the Instruction Manual: Maintenance.