Dynamixel 320 set_angle_limit


I4m trying to set new values for the angle limits of my dynamixel 320 motor.

the following command :
gives me ((-150.0, 150.0),)

then I set new values :
dxl_io.set_angle_limit({1: (100.0, -100.0)})

and when I get the angle limit again, nothing is changed, the values returned by dxl_io.get_angle_limit({1}) are still ((-150.0, 150.0),)

How can I change these limits ? What is the maximal values to respect to avoid damaging motors ? Is this motor usable as a servo with a full 360° of range ?

Thank you for your help,