Siemens SINUMERIK 828D Function Manual page 1227

No travel to target position
The machine axis is now referenced. To identify this, the NC sets an interface signal for the measuring system
that is currently active:
DB31, ... DBX60.4 / 60.5 (Referenced/Synchronized 1/2) = 1
Features of phase 2
Phase 2 will display different characteristics, depending on whether a reference point cam is parameterized for
the machine axis.
Machine axis without reference point cam
MD34000 $MA_REFP_CAM_IS_ACTIVE (Axis with reference point cam) = 0
Properties:
• Feed override active.
• The feed stop (channel­specific and axis­specific) is active.
• NC STOP and NC START are active.
Machine axis with reference point cam
MD34000 $MA_REFP_CAM_IS_ACTIVE (Axis with reference point cam) = 1
Properties:
• Feedrate override is not active.
Machine axis moves internally when feedrate override = 100%.
If a feedrate override of 0% is specified, an abort occurs.
• The feed stop (channel­specific and axis­specific) is active.
• NC-STOP and NC-START are not active.
• If the parameterized number of reference marks is not detected within the parameterized distance after the
exit of the reference cam, the machine axis will be stopped.
MD34060 $MA_REFP_MAX_ MARKER_DIST (max. distance to the reference mark)
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)
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
15.6 Referencing with distance­coded reference marks
R1: Reference point approach
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