Methods 15 and 16: Reserved
These methods are reserved for future expansion of the homing mode.
Methods 17 to 30: Homing without an index pulse
These methods are similar to methods 1 to 14, except that the home position is not
dependent on the index pulse; it is dependent only on the relevant home or limit switch
transitions. For example, methods 19 and 20 are similar to methods 3 and 4, as shown in
the following diagram: