Siemens SINUMERIK 840D sl Commissioning Manual page 163

Phase 1: Synchronize by overriding 2 reference marks
The following machine data and interface signals are relevant:
● MD34010 REFP_CAM_DIR_IS_MINUS (approach reference cam in negative direction)
● MD34040 REFP_VELO_SEARCH_MARKER (referencing velocity)
● MD34060 REFP_MAX_MARKER_DIST (maximum distance between 2 reference marks)
● MD34300 ENC_REFP_MARKER_DIST (reference marker distance)
● IS: DB21 .. 30, DBX36.2 ("All axes to be referenced are referenced")
● IS: DB31, ... DBX4.7/DBX4.6 ("Traversing keys plus/minus")
● IS: DB31, ... DBX12.7 ("Reference point approach delay")
● IS: DB31, ... DBX60.4, DBX60.5 ("Referenced/synchronized 1, 2")
Properties of phase 1:
● If the machine axis travels from the initial position a distance defined in
Phase 2: Traversing to the target point
The following machine data and interface signals are relevant:
● MD34070 REFP_VELO_POS (target point positioning velocity)
● MD34090 REFP_MOVE_DIST_CORR (absolute offset)
● MD34100 REFP_SET_POS (target point)
● MD34330 REFP_STOP_AT_ABS_MARKER (with/without target point)
● IS: DB31, ... DBX60.4, DBX60.5 ("Referenced/synchronized 1, 2")
Properties of phase 2:
● The feed rate override (feed rate switch) is active.
● The feed stop (channelspecific and axisspecific) is active.
● The machine axis can be stopped and restarted with NC stop/NC start.
IBN CNC: NCK, PLC, drive
Commissioning Manual, 07/2007, 6FC5397-2AP10-3BA0
MD34300 REFP_MARKER_DIST (max. distance to the reference mark) without two
reference marks being overtraveled, then the machine axis stops and
the system issues alarm 20004 "Reference mark missing".
NCK start-up
10.5 Parameterize axis data
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