Reference Point Approach (Axis) - Siemens SINUMERIK FM-NC Installation And Startup Manual

6 Assigning Parameters to the Control and the PLC Program
6.9 Axes and spindles
6.9.12

Reference point approach (axis)

General
machine data and
interface
signals
Reference point
approach for
incremental
measuring
systems
Machine data and
interface signals
for phase 1
Machine data for
phase 2
Machine data and
interface signals
for phase 3
Actual value
buffering via
Power Off
6-138
After the control has been switched on, it must be synchronized (referenced)
with the position measuring system of every machine axis.
Referencing must be carried out for axes with incremental measuring systems
and with distance-coded reference marks.
Referencing is started after selection of the "REF" function with traversing key
PLUS or MINUS (depending on reference point approach direction).
References: /FB/, R1, "Reference Point Approach"
MD 34000: REFP_CAM_IS_ACTIVE (axis with reference cam)
MD 34110: REFP_CYCLE_NR (axis sequence with channel-specific
reference point approach)
MD 30240: ENC_TYPE (encoder type)
MD 34200: ENC_REFP_MODE (referencing mode)
IS "Activate referencing" (DB21, ... DBX1.0)
IS "Reference active" (DB21, ... DBX33.0)
The reference point approach for incremental measuring systems is split into
three phases:
Phase 1: Approach reference cam
Phase 2: Synchronize with zero mark
Phase 3: Approach reference point
MD 11300: JOG_INC_MODE_LEVELTRIGGRD (INC/REF in JOG mode)
MD 34010: REFP_CAM_DIR_IS_MINUS (approach reference cam in minus
direction)
MD 34020: REFP_VELO_SEARCH_CAM (reference cam approach velocity)
MD 34030: REFP_MAX_CAM_DIST (maximum path to reference cam)
IS "Traversing keys plus/minus" (DB31, ... DBX4.7/DBX4.6)
IS "Reference point approach delay" (DB31, ... DBX12.7)
MD 34040: REFP_VELO_SEARCH_MARKER (creep speed)
MD 34050: REFP_SEARCH_MARKER_REVERSE (direction reversal to
reference cam)
MD 34060: REFP_MAX_MARKER_DIST (maximum path from cam to
reference mark)
MD 34070: REFP_VELO_POS (reference point approach speed)
MD 34080: REFP_MOVE_DIST (reference point distance zero speed)
MD 34090: REFP_MOVE_DIST_CORR (additive reference point offset)
MD 34100: REFP_SET_POS (reference point value)
IS "Reference point value 1...4" (DB31, ... DBX2.4, 2.5, 2.6, 2.7)
IS "Referenced/synchronized 1, 2" (DB31, ... DBX60.4, DBX60.5)
As from SW 4, it is possible to continue to run a conventional machine tool with
the original position information without explicit re-referencing after Power On/
Off.
A condition for correct referencing continuation of the axes after Power Off/On is
that the axes concerned have not been moved in the meantime.
SINUMERIK 840D Installation and Start-Up Guide (IAD) – 04.00 Edition
 Siemens AG 2000 All Rights Reserved
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