Mitsubishi Electric MELFA FR CR800 Series User Manual page 605

Reversed
Sets whether or not to reverse the movement of child items. When set to [Reversed], the direction of rotation or
the direction of movement is reversed.
By creating joints of [Not Reversed] and [Reversed] and assigning them to the same axis, it becomes possible
to make symmetrical movement.
21-605
Figure 21-146 Joint type of joint(Axis linear)
Figure 21-147 Reversed of Joint
21-605