Reference Point Approach (R1)
18.3 Referencing with distancecoded reference markers
Turning, Milling, Nibbling
324 Function Manual, 11/2012, 6FC5397-1CP10-5BA0
18.3.4 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 the reference point approaching process is started, the machine axis accelerates to
the reference point shutdown speed set by means of parameter assignment:
MD34040 REFP_VELO_SEARCH_MARKER (reference point shutdown speed)
Once the number of reference markers set by means of parameter assignment 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 REFP_VELO_SEARCH_MARKER (reference point shutdown speed)
MD34010 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 number of reference markers set by means of parameter assignment 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 the reference point approaching process is started, the machine axis accelerates to
the reference point shutdown speed set by means of parameter assignment:
MD34040 REFP_VELO_SEARCH_MARKER (reference point shutdown speed)
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