Siemens SINUMERIK FM-NC Installation And Startup Manual page 139

05.97
03.96
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.
Reference point
Referencing of axes with distance-coded reference marks is executed in 2
approach with phases:
Phase 1: Synchronize by overriding 2 reference marks
distance-coded
Phase 2: Traverse to target point
reference markers
General
MD 34310: ENC_MARKER_INC (differential distance between two reference
machine data marks)
MD 34320: ENC_INVERS (inverse measuring system)
Machine data and
MD 11300: JOG_INC_MODE_LEVELTRIGGRD (INC and REF in JOG mode)
interface signals
MD 34040: REFP_VELO_SEARCH_MARKER (referencing speed)
for phase 1
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)
Machine data and
MD 34070: REFP_VELO_POS (target point approach speed)
interface signals MD 34090: REFP_MOVE_DIST_CORR (absolute offset)
MD 34330: REFP_STOP_AT_ABS_MARKER (with/without target point)
for phase 2
IS "Referenced/synchronized 1, 2" (DB31, ... DBX60.4, DBX60.5)
MD 34100: REFP_SET_POS (target point), for referencing to target.
Referencing with
If an axis uses an absolute encoder as its measuring system, then it only needs
absolute encoders to be referenced when the encoder is readjusted.
Note
See Section 6.9.6 for details of absolute encoders.
 Siemens AG 2000 All Rights Reserved
SINUMERIK 840D Installation and Start-Up Guide (IAD) – 04.00 Edition
6 Assigning Parameters to the Control and the PLC Program
6.9 Axes and spindles
6-139
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