Siemens SINUMERIK 840DiE sl Manual page 360

11 NCK Commissioning with HMI Advanced
11.5 Axes and spindles
Phase 1:
Synchronize by
overriding 2 reference
marks
Phase 2:
Traversing to the target
point
Determining the
absolute offset
11-360
The following machine data and interface signals are important:
S
MD34010: REFP_CAM_DIR_IS_MINUS (approach reference cam in nega-
tive direction)
S
MD34040: REFP_VELO_SEARCH_MARKER (referencing velocity)
S
MD34060: REFP_MAX_MARKER_DIST (maximum distance between 2
reference marks)
S
MD34300: ENC_REFP_MARKER_DIST (reference marker distance)
S
IS: DB21 .. 30, DBX36.2 ("All axes to be referenced are referenced")
S
IS: DB31, ... DBX4.7/DBX4.6 ("Traversing keys plus/minus")
S
IS: DB31, ... DBX12.7 ("Reference point approach delay")
S
IS: DB31, ... DBX60.4, DBX60.5 ("Referenced/synchronized 1, 2")
Properties of phase 1
S
If the machine axis traverses a distance defined in
– MD34300: REFP_MARKER_DIST (max. distance to the reference
mark)
without overtraveling the two reference marks, the machine axis stops and
– alarm 20004 "Reference mark missing"
is output.
The following machine data and interface signals are important:
S
MD34070: REFP_VELO_POS (reference point positioning velocity)
S
MD34090: REFP_MOVE_DIST_CORR (absolute offset)
S
MD34100: REFP_SET_POS (target point)
S
MD34330: REFP_STOP_AT_ABS_MARKER (with/without target point)
S
IS: DB31, ... DBX60.4, DBX60.5 ("Referenced/synchronized 1, 2")
Properties of phase 2
S
The feed rate override (feed rate switch) is active.
S
The feed stop (channel–specific and axis–specific) is active.
S
The machine axis can be stopped and restarted with NC–Stop/NC–Start.
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
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:
S
MD34090: REFP_MOVE_DIST_CORR = 0
© Siemens AG 2007 All Rights Reserved
SINUMERIK 840Di sl Manual (HBIsl) – 01/2007 Edition
01/2007