Detailed Description
2.5 Referencing with distance-coded reference marks
Reference Point Approach (R1)
2-28 Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
Features of phase 2
Irrespective of whether a reference point cam is parameterized for the machine axis, phase 2
exhibits different properties:
• Machine axis without reference point cam
MD34000 $MA_REFP_CAM_IS_ACTIVE (axis with reference point cam) = 0
Properties:
– Feed override active.
– Feed stop (channel-specific and axis-specific) is active.
– NC STOP and NC START are active.
• Machine axis with reference point cam
MD34000 $MA_REFP_CAM_IS_ACTIVE (axis with reference cam) = 1
Properties:
– Feedrate correction is not active.
Machine axis moves internally when feedrate override = 100%.
If a feedrate override of 0% is specified, an abort occurs.
– Feed stop (channel-specific and axis-specific) is active.
– NC STOP and NC START are not active.
– After the reference cam is exited, 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.
Special features of rotary measuring systems
On rotary distancecoded measuring systems, the absolute position can only be determined
uniquely within one revolution. Depending on the mechanical mounting of the encoder, the
overtravel of the absolute position in the hardware does not always coincide with the
traversing range of the rotary axis.
Special features of modulo rotary axes
With module rotary axes, the reference point position is mapped on the parameterized
modulo range:
MD30330 $MA_MODULO_RANGE (extent of modulo range)
MD30340 $MA_MODULO_RANGE_START (starting position of modulo range)
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