Set command 6040 = 0xE, and then set another command 6040 = 0xF. Then you can switch the 
motor drive to Operation Enable. The Index 605A determines the direction of the lines from 
Operation Enable when the control mode changes from Quick Stop Active. When the setting value 
is 5–7, both direction lines are active, but when the setting value of 605A is not 1–3, once the motor 
drive is switched to Quick Stop Active, it is not able to switch back to Operation Enable...