Technical data

Configuration
CPU 317T: Technology Functions
A5E00251798-03
4-51
Time-based execution of the reference point approach
• Phase 1: Synchronization to BERO
The axis starts its reference point approach at the configured approach velocity
and in the direction set in "Direction of reference point approach."
Synchronization ends at the BERO (phase 1) when the configured signal
transition (configured at the drive component) is detected at the BERO signal.
The axis position is set to the default value minus the homing position offset
value defined in "Homing position coordinate" (Mode = 0) or at input parameter
Position (Mode = 1.)
You can also monitor the distance an axis travels between the start of
reference point approach and detection of the signal edge by setting the "Max.
distance to BERO" check box. Homing is canceled with error if the edge is not
detected between the start of reference point approach and the end of the
configured distance.
• Phase 2:
Approach to homing position
After the configured signal edge is detected, the axis accelerates / decelerates
at shutdown velocity to the homing point coordinate.
If a homing position offset was configured, the axis approaches the homing
position along the corresponding distance, starting at the synchronization
position. The traversing direction is determined by the sign of the homing point
offset value and by the length of the deceleration ramp after zero mark
detection, if the homing position lies within the deceleration ramp.
Active homing in "Zero mark only" mode