Siemens SINUMERIK 840D sl Function Manual page 1173

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 cam is
parameterized for the machine axis.
Machine axis without reference cam
MD34000 $MA_REFP_CAM_IS_ACTIVE (axis with reference cam) = 0
Properties:
● Feed override active.
● The feed stop (channel-specific and axis-specific) is active.
● NC stop and NC start are active.
Machine axis with reference cam
MD34000 $MA_REFP_CAM_IS_ACTIVE (axis with reference 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 (channel-specific and axis-specific) 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 distance-coded 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 (size of the modulo range)
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
15.6 Referencing with distance-coded reference marks
R1: Referencing
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