Siemens Sinumerik 840DiE sl - Page 359

01/2007
11.5 Axes and spindles
11-359
© Siemens AG 2007 All Rights Reserved
SINUMERIK 840Di sl Manual (HBIsl) – 01/2007 Edition
When clearance–coded reference marks are used, referencing is divided into 2
phases:
1. Synchronize by overriding 2 reference marks
2. Traverse to target point
IS ”Approach ref. point delay”
(DB31, ... DBX12.7)
IS ”Travel command minus”
(DB31, ... DBX64.6)
IS ”Travel command plus/minus”
(DB31, ... DBX4.7 and 4.6)
IS Referenced/synchronized”
(DB31, ... DBX60.4 and 60.5)
Reference mark length measuring
system
Velocity
MD34040:
REFP_VELO_SEARCH_MARKER
(Reference–point shutdown velocity)
MD34070: REFP_VELO_POS
(Reference–point positioning velocity)
Phase 2Phase 1
t
Fig. 11-24 Signal chart: Distance–coded reference marks (principle)
The following machine data and interface signals are independent with re-
spect to the individual phases of reference point approach:
S MD11300: JOG_INC_MODE_LEVELTRIGGRD (INC/REF in jog mode)
S MD34000: REFP_CAM_IS_ACTIVE (axis with reference cam)
S MD34110: REFP_CYCLE_NR (axis sequence for channel–specific refer-
ence point approach)
S MD30240: ENC_TYPE (encoder type)
S MD34200: ENC_REFP_MODE (referencing mode)
S MD34310: ENC_MARKER_INC (interval between two reference marks)
S MD34320: ENC_INVERS (inverse measuring system)
S IS: DB21, ... DBX1.0 (”Activate referencing”)
S IS: DB21, ... DBX33.0 (”Referencing active”)
Distance–coded
Reference marks
Phase–independent
data
11 NCK Commissionin
g
with HMI Advanced