Detailed Description
2.5 Referencing with distance-coded reference marks
Reference Point Approach (R1)
2-26 Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
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.
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.
Plausiblity check of the reference mark distance
During reference point approach, if the NC determines a distance greater than twice the
assigned reference mark distance:
MD34300 $MA_ENC_REFP_MARKER_DIST (reference mark distance)
for two consecutive reference marks, an error occurs.
The machine axis is then moved in the opposite direction at half the assigned reference point
creep velocity:
MD34040 $MA_REFP_VELO_SEARCH_MARKER (reference point creep velocity)
and the reference mark search is restarted.
If another incorrect reference mark is detected, the machine axis is stopped, reference point
approach is aborted and the following alarm is displayed:
Alarm 20003 "Error in measuring system"
Abort criterion
If the assigned number of reference marks is not detected within the assigned distance:
MD34060 $MA_REFP_MAX_ MARKER_DIST (maximum distance to reference mark)
the machine axis is stopped and reference point approach is aborted.
Features of phase 1
• After phase 1 is successfully completed, the actual value system of the machine axis is
synchronized.
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