The sensors do not need to be "homed" for their function since the position feedback is fixed in reference to its body. Regarding the system they are installed in, it is good practice to "calibrate" their position feedback to the relative position of the system to compensate for any offset incurred during the installation process of the sensor.

Ron-Festo Inciong So in essence... it needs to be calibrated one time and moving forward only needs to be calibrated again if it gets bumped out of position. I think of it similar to a set of digital dial calipers.