6 Assi
nin
Parameters to the Control and the PLC Pro
ram
6
03.96
6.9 Axes and spindles
6-139
Siemens AG 2000 All Rights Reserved
SINUMERIK 840D Installation and Start-Up Guide (IAD) – 04.00 Edition
When the encoder is switched on, the NC then synchronizes to an internal buff-
ered old absolute value (condition: Set MD 34210: ENC_REFP_STATE=2).
Axis movements are blocked internally until this synchronization is completed.
The spindles can continue to turn.
Note
This functionality is permanent linked to the axis signal “Fine exact positioning”.
Axes or spindles that do not use this signal cannot use this functionality.
Referencing of axes with distance-coded reference marks is executed in 2
phases:
Phase 1: Synchronize by overriding 2 reference marks
Phase 2: Traverse to target point
MD 34310: ENC_MARKER_INC (differential distance between two reference
marks)
MD 34320: ENC_INVERS (inverse measuring system)
MD 11300: JOG_INC_MODE_LEVELTRIGGRD (INC and REF in JOG mode)
MD 34040: REFP_VELO_SEARCH_MARKER (referencing speed)
MD 34060: REFP_MAX_MARKER_DIST (maximum path between two refer-
ence paths)
MD 34300: ENC_REFP_MARKER_DIST (reference mark distance)
IS “Traversing keys plus/minus” (DB31, ... DBX4.7, DBX4.6)
IS “Referenced/synchronized 1, 2” (DB31, ... DBX60.4, DBX60.5)
MD 34070: REFP_VELO_POS (target point approach speed)
MD 34090: REFP_MOVE_DIST_CORR (absolute offset)
MD 34330: REFP_STOP_AT_ABS_MARKER (with/without target point)
IS “Referenced/synchronized 1, 2” (DB31, ... DBX60.4, DBX60.5)
MD 34100: REFP_SET_POS (target point), for referencing to 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
See Section 6.9.6 for details of absolute encoders.
Reference point
approach 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
05.97
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