Siemens SINUMERIK 840Di Function Manual page 1532

Detailed Description
2.2 Reference/Synchronize
Special features for synchronization with BERO
The position falsification caused by the signal delay with BERO can be corrected internally in
the NC by entering a signal runtime compensation.
A signal runtime compensation (dead time) for positive and negative directions of motion in
conjunction with the machine data setting:
MD34200 $MA_ENC_REFP_MODE = 2 or 7
is entered in machine data:
MD31122 $MA_BERO_DELAY_TIME_PLUS
or
MD31123 $MA_BERO_DELAY_TIME_MINUS.
• Setting:
2-28
Note
During synchronization of the spindle, all four possible reference point values and
reference point offsets are effective as appropriate to the measurement system selected.
The measurement system offset has the same effect.
The following machine data must be observed:
MD34080 $MA_REFP_MOVE_DIST
(reference point distance/end point for distance-coded system)
MD34090 $MA_REFP_MOVE_DIST_CORR
(reference point offset/absolute offset, distance-coded)
MD34100 $MA_REFP_SET_POS
(reference point value, of no relevance in the case of distance-coded system).
If a non-homed spindle with SPOS=IC(...) and a path < 360 degrees is positioned, it
may be the case that the zero mark is not crossed and the spindle position is still not
synchronized with the zero mark.
This can happen:
- After POWER ON
- By setting the axial NC/PLC interface signals:
DB31, ... DBX17.5 (resynchronize spindle at position 2)
and
DB31, ... DBX17.4 (resynchronize spindle at position 1)
MD34200 $MA_ENC_REFP_MODE = 7
executes position synchronization only at a fixed velocity/speed defined in machine data:
MD34040 $MA_REFP_VELO_SEARCH_MARKER.
The velocity defined in machine data:
MD34040 $MA_REFP_VELO_SEARCH_MARKER
is also effective when homing in operating mode JOG-REF and through the part program
with G74.
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
Spindles (S1)