Siemens SINUMERIK 804D sl Commissioning Manual page 154

NCK start-up
10.5 Parameterize axis data
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.
Determining the absolute offset
To determine the absolute offset between the measuring system zero point and the machine
zero, the following procedure is recommended:
1. Determining the actual position of the measuring system
• MD34090 REFP_MOVE_DIST_CORR = 0
1. Determine the absolute machine actual position
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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".
After two reference marks following one after the other (synchronized) have been
overtraveled, the actual position of the length measuring system can be read on the user
interface at "Actual position".
The absolute offset must be zero at this time:
CNC Part 1 (NCK, PLC, drive)
Commissioning Manual, 11/2006, 6FC5397-2AP10-2BA0