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6 Programming the control
6.9
Axes and spindles
Referencing with
distance-coded
reference markers
General machine
data
Machine data and
interface signals for
phase 1
Machine data and
interface signals for
phase 2
Referencing with
absolute encoders
6-114
When the encoder is switched on, NCK then synchronizes with an internally
buffered old absolute value (condition: MD 34210: ENC_REFP_STATE=2).
Axis motions are internally disabled until this synchronization process is termi-
nated; spindle operation can continue.
Note
This functionality is permanently linked to the axis signal "Exact stop fine".
Axes or spindles not using this signal cannot use this functionality.
Referencing with axes with distance-coded reference markers is divided into
2 phases:
Phase 1:
Synchronize by traveling over 2 reference markers
Phase 2:
Move to target
MD 34310: ENC_MARKER_INC (distance between two reference markers)
MD 34320: ENC_INVERS (measuring system in opposite direction)
MD 11300: JOG_INC_MODE_LEVELTRIGGRD (INC and REF in Jog mode)
MD 34040: REFP_VELO_SEARCH_MARKER (referencing velocity)
MD 34060: REFP_MAX_MARKER_DIST (maximum distance between 2 refe-
rence markers)
MD 34300: ENC_REFP_MARKER_DIST (distance from reference marker)
NST "Traverse buttons plus/minus" (DB31, ... DBX4.7/DBX4.6)
NST "Referenced/synchronized 1, 2" (DB31, ... DBX60.4, DBX60.5)
MD 34070: REFP_VELO_POS (target move-in velocity)
MD 34090: REFP_MOVE_DIST_CORR (absolute move)
MD 34330: REFP_STOP_AT_ABS_MARKER (with/without target)
NST "Referenced/synchronized 1, 2" (DB31, ... DBX60.4, DBX60.5)
MD 34100: REFP_SET_POS (target) if referencing on target.
If an axis uses an absolute encoder as its measuring system, then it only needs
to be referenced when the encoder is readjusted.
Note
For absolute encoder, see subsection 6.9.6.
SINUMERIK 840D/810D Start-Up Guide (IADC) – 03/2006 Edition
© Siemens AG 2006 All Rights Reserved
03/2006
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