Siemens SINUMERIK 840D sl Commissioning Manual page 161

Phase 2: Synchronizing to the encoder zero mark
The following machine data and interface signals are relevant:
● MD34040 REFP_VELO_SEARCH_MARKER (creep velocity)
● MD34050 REFP_SEARCH_MARKER_REVERSE (direction reversal to reference cam)
● MD34060 REFP_MAX_MARKER_DIST (maximum distance from cam to reference mark)
Properties of phase 2:
● Feed override (the feed override switch) is not active.
● Feed stop (channel-specific and axis-specific) is active.
● Alarm 20005 "Reference point approach canceled"
● NC-Stop/NC-Start is inactive.
● With IS: DB31, ... DBX12.7 ("Reference point approach delay") = 0, the machine axis
Phase 3: Approach reference point
The following machine data and interface signals are relevant:
● MD34070 REFP_VELO_POS (reference point positioning velocity)
● MD34080 REFP_MOVE_DIST (reference point distance to zero mark)
● MD34090 REFP_MOVE_DIST_CORR (reference point offset, additive)
● MD34100 REFP_SET_POS (reference point value)
● IS: DB31, ... DBX2.4, 2.5, 2.6, 2.7 ("Reference point value 1...4")
● IS: DB31, ... DBX60.4, DBX60.5 ("Referenced/synchronized 1, 2")
Properties of phase 3:
● Feed override (the feed override switch) is active.
● Feed stop (channel-specific and axis-specific) is active.
● NC-Stop/NC-Start is active.
Literature
Function Manual Basic Functions; Reference point approach: Referencing with incremental
measurement systems
IBN CNC: NCK, PLC, drive
Commissioning Manual, 07/2007, 6FC5397-2AP10-3BA0
If a feed override of 0% is selected via the feed override switch, the traverse movement is
stopped.
On a feed stop, the traverse movement is stopped and the alarm displayed:
traverses a distance parameterized in the following machine data after leaving the
reference cam.
– MD34060 REFP_MAX_MARKER_DIST (max. distance to the reference mark)
Without the zero mark being detected, the machine axis stops and the following alarm
is displayed:
Alarm 20002 "Zero mark missing"
NCK start-up
10.5 Parameterize axis data
161