It's an offset of the Home sensor. After the zero search is finished the motor is positioned to the
“Home Position” and the position is set to zero.
A zero search is split in 2 phases. First the motor is moving with the specified "Home velocity" and
direction towards the sensor and finds this and set the
position to zero. Next step is setting "P_SOLL"=0 and "P_IST" to "Home Position"
and change mode to Position mode and the motor is now moving
to position zero.