Siemens Sinumerik 840DiE sl - Referencing an Axis

01/2007
11.5 Axes and spindles
11-355
© Siemens AG 2007 All Rights Reserved
SINUMERIK 840Di sl Manual (HBIsl) – 01/2007 Edition
11.5.19 Referencing an axis
When referencing a machine axis, the actual position value system of the ma-
chine axis is synchronized with the machine geometry. Depending on the en-
coder type used, the machine axis is referenced with or without traversing
movements.
For all machine axes which are not equipped with an encoder providing an ab-
solute actual position value, referencing is carried out by traversing the machine
axis, the so–called reference point approach.
The reference point approach can be carried out either manually in JOG mode,
submode REF or using a part program. Reference point approach is started
using traverse direction keys PLUS or MINUS (depending on the parameterized
reference point approach direction).
With incremental measuring systems, referencing is carried out using a refer-
ence point approach divided into 3 phases:
1. Traversing to the reference cam
2. Synchronizing to the encoder zero marker
3. Approach reference point
IS ”Approach ref. point delay”
(DB31, ... DBX12.7)
IS ”Travel command plus”
(DB31, ... DBX64.7)
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)
Zero–mark positioning
measurement system
Velocity
MD34020: REFP_VELO_SEARCH_CAM
Reference–point approach velocity
MD34040: REFP_VELO_SEARCH_MARKER
Reference–point shutdown velocity
MD34070: REFP_VELO_POS
Reference–point positioning velocity
Phase 2Phase 1 Phase 3
t
Fig. 11-23 Signal chart: Referencing with an incremental measuring system (principle)
Referencing
Reference point
approach
Incremental
measuring
systems
11 NCK Commissionin
g
with HMI Advanced