# Referencing with motion away from cam

## Notice

Referencing takes place on the falling edge using a simple method, i.e. by inverting the motion direction during referencing (ref_richt) and the cam switch signal level (cam_level). Providing the cam switch is operated at the start of homing, this is then a 3-phase homing.

This method has advantages if the reference position is outside the corresponding software limit switch in the method described above. The following changes result for the above example:

Parameterisation | P-AXIS-00038 (cam_level) | 0
| P-AXIS-00158 (ref_richt) | 0

Referencing at motion away from reference cam (without zero pulse)