Pressbrake CNC Control Setup Questions

case 0:
                if (axis_home_switch(axis)) {
                    axis_pos_cmd_out(axis) = axis_home_offset(axis) * 2;
                    axis_vel_cmd(axis) = axis_home_search_velocity(axis);
                    home_state = 1;
                } else {
                    axis_index_enable(axis) = 1;
                    axis_pos_cmd_out(axis) = -1 * axis_home_offset(axis);
                    axis_vel_cmd(axis) = axis_home_search_velocity(axis);
                    home_state = 2;
                }
                break;
            case 1: // searching down, Press Up
                if (! axis_home_switch(axis)){
                    [color=#c0392b][u]axis_pos_cmd_out(axis) = 0;[/u][/color]
                    home_state = 0;
                }
                break;
            case 2: // searching up, Press Down
                if (! axis_index_enable(axis)){
                    offset(axis) = axis_pos_fb_in(axis) - axis_home_offset(axis);
                    [color=#c0392b][u]axis_pos_cmd_out(axis) = 0;[/u][/color]
                    home_state = 0;
                    state = 0;
                }
                break;

case HOME_INDEX_ONLY_START:
        /* This state is used if the machine has been pre-positioned
           near the home position, and simply needs to find the
           next index pulse.  It starts a move at latch_vel, and
           sets index-enable, which tells the encoder driver to
           reset its counter to zero and clear the enable when the
           next index pulse arrives. */
        /* is the joint already moving? */
        if (joint->free_tp.active) {
            /* yes, reset delay, wait until joint stops */
            H[joint_num].pause_timer = 0;
            break;
        }
        /* has delay timed out? */
        if (H[joint_num].pause_timer < (HOME_DELAY * servo_freq)) {
            /* no, update timer and wait some more */
            H[joint_num].pause_timer++;
            break;
        }
        H[joint_num].pause_timer = 0;
        /* Although we don't know the exact home position yet, we
           we reset the joint coordinates now so that screw error
           comp will be appropriate for this portion of the screw
           (previously we didn't know where we were at all). */
        /* set the current position to 'home_offset' */
        offset = H[joint_num].home_offset - joint->pos_fb;
        /* this moves the internal position but does not affect the
           motor position */
        joint->pos_cmd += offset;
        joint->pos_fb += offset;
        joint->free_tp.curr_pos += offset;
        joint->motor_offset -= offset;
        /* set the index enable */
        H[joint_num].index_enable = 1;
        /* set up a move at 'latch_vel' to find the index pulse */
        home_start_move(joint, H[joint_num].home_latch_vel);
        /* next state */
        H[joint_num].home_state = HOME_INDEX_SEARCH_WAIT;
        break;