Siemens SINUMERIK 840Di - Page 355

06.03
10.5 Axes and spindles
10-355
 Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
When clearance-coded reference marks are used, referencing is divided into 2
phases:
1. Synchronizing by overtraveling 2 reference marks
2. Traversing to target point
IS “Reference point approach delay”
(DB31, ... DBX12.7)
IS “Traversing command minus”
(DB31, ... DBX64.6)
IS “Traversing key plus/minus”
(DB31, ... DBX4.7 and 4.6)
IS “Referenced/synchronized”
(DB31, ... DBX60.4 and 60.5)
Reference marks of length measuring
system
Velocity
MD 34040:
REFP_VELO_SEARCH_MARKER
(Reference-point shutdown velocity)
MD 34070: REFP_VELO_POS
(Reference-point positioning velocity)
Phase 2Phase 1
t
Fig. 10-26 Clearance-coded reference marks
The following machine data and interface signals are independent with re-
spect to the individual phases of reference point approach:
 MD11300: JOG_INC_MODE_LEVELTRIGGRD (INC/REF in jog mode)
 MD34000: REFP_CAM_IS_ACTIVE (axis with reference cam)
 MD34110: REFP_CYCLE_NR (axis sequence with channel-specific refer-
ence point approach)
 MD 30240: ENC_TYPE (encoder type)
 Set MD 34200: ENC_REFP_MODE (referencing mode)
 MD 34310: ENC_MARKER_INC (interval between two reference marks)
 MD 34320: ENC_INVERS (inverse measuring system)
 IS: DB21, ... DBX1.0 (“Activate referencing”)
 IS: DB21, ... DBX33.0 (“Referencing active”).
The following machine data and interface signals are important:
 MD34010: REFP_VELO_SEARCH_CAM (reference cam approach in the
negative direction)
Clearance-coded
reference marks
Phase-independent
data
Phase 1:
Synchronizing by
overtraveling 2
reference marks
10 NC Start-U
p
with HMI Advanced