Detailed description
2.5 Referencing with distancecoded reference marks
Basic logic functions: Reference Point Approach (R1)
30 Function Manual, 11/2006, 6FC5397-0BP10-2BA0
2.5.4 Phase 1: Travel across the reference marks with synchronization
Phase 1: Start
For information on starting reference point approach, refer to "Axis-specific referencing" and
"Channel-specific referencing."
reference cam
In measuring systems with distance-coded reference marks, reference cams are not
required for the actual referencing action. For functional reasons, however, a reference cam
is required for channel-specific reference point approach and reference point approach from
the part program (G74) before the traversing range end of the machine axis.
Phase 1: Sequence
Sequence without touching a reference cam
Once reference point approach is started, the machine axis accelerates to the assigned
reference point creep velocity:
MD34040 $MA_REFP_VELO_SEARCH_MARKER (reference point creep velocity)
Once the parameterized number of reference marks has been crossed, the machine axis is
stopped again and the actual value system of the machine axis is synchronized to the
absolute position calculated by the NC.
Sequence when starting from the reference cam
If the machine axis is at the reference cam at the start of the reference point traversing, it
accelerates to the parameterized reference point creep velocity against the parameterized
reference point approach direction:
MD34040 $MA_REFP_VELO_SEARCH_MARKER (reference point creep velocity)
MD34010 $MA_CAM_DIR_IS_MINUS (Reference point approach in minus direction)
That ensures that the machine axis does not reach the travel range limit before it has
crossed the parameterized number of reference marks.
Once the parameterized number of reference marks has been crossed, the machine axis is
stopped again and the actual value system of the machine axis is synchronized to the
absolute position calculated by the NC.
Sequence when contact is made with reference cam during referencing
Once reference point approach is started, the machine axis accelerates to the assigned
reference point creep velocity:
MD34040 $MA_REFP_VELO_SEARCH_MARKER (reference point creep velocity)
Before the machine axis travels over the parameterized number of reference marks, it
touches the reference cam. It is then reversed and reference mark search is restarted in the
opposite direction.
To Next Page
Loading...
Need help?
General
