6 Pro
rammin
the control
6
03/2006
6.9 Axes and spindles
6-113
© Siemens AG 2006 All Rights Reserved
SINUMERIK 840D/810D Start-Up Guide (IADC) – 03/2006 Edition
6.9.12 Referencing an axis
Once the control has been switched on, it must be synchronized (referenced)
with the position measuring system of each 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).
Reference material: /FB1/ R1 Functional description of the basic machines,
Referencing
MD 34000: REFP_CAM_IS_ACTIVE (axis with reference cam)
MD 34110: REFP_CYCLE_NR (order of the axes for channel-specific
referencing)
MD 30240: ENC_TYPE (encoder type)
MD 34200: ENC_REFP_MODE (referencing mode)
NST “Activate referencing” (DB21, ... DBX1.0)
NST “Referencing active” (DB21, ... DBX33.0)
Referencing for incremental measuring systems is divided into 3 phases:
Phase 1: Move onto reference cam
Phase 2: Synchronize with zero marker
Phase 3: Move to 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 approachvelocity)
MD 34030: REFP_MAX_CAM_DIST (maximum distance from reference cam)
NST “Traverse buttons plus/minus” (DB31, ... DBX4.7/DBX4.6)
NST “Referencing delay” (DB31, ... DBX12.7)
MD 34040: REFP_VELO_SEARCH_MARKER (cut-out velocity)
MD 34050: REFP_SEARCH_MARKER_REVERSE (change of direction at
reference cam)
MD 34060: REFP_MAX_MARKER_DIST (maximum distance from cam to
reference marker)
MD 34070: REFP_VELO_POS (reference point move-in velocity)
MD 34080: REFP_MOVE_DIST (distance from reference point to zero marker)
MD 34090: REFP_MOVE_DIST_CORR (reference point move, additive)
MD 34100: REFP_SET_POS (reference point value)
NST “Reference point value 1...4” (DB31, ... DBX2.4, 2.5, 2.6, 2.7)
NST “Referenced/synchronized” 1, 2” (DB31, ... DBX60.4, DBX60.5)
It is possible to continue to operate a conventional machine tool, for example,
with the original position information without explicitly rereferencing after Power
Off/On.
To ensure that axes can continue operating properly referenced after the power
has been switched off and on again, it is essential that they are not moved while
the power is switched off.
General machine
data and interface
signals
Referencing 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 buffer-
ing via Power Off
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