Okuma Alarm-B 2724 Invalid ATC sub arm
When tool extraction or insertion by sub arm was attempted, the sub arm was not located either in ready station or magazine position.
1->In tool extraction by sub arm, the sub arm position was lost.
2->In tool insertion by sub arm, the sub arm position was lost.
Probable Faulty Locations
1)Sub arm ready station position input is OFF.
2)Sub arm magazine position input is OFF.
In selective or step operation, the start button was pressed for tool extraction/insertion by sub arm.
Measures to Take
Check the ATC input bit with the check data screen.