Siemens SINUMERIK 840C - Manual (Page 377)

6 NC Machine Data (NC MD), NC Setting Data (NC SD) 07.97
6.7.1 Axis-specific MD bits 2 (axial bits 2)
7 6 5 4 3 2 1 0
Bit No.
NC MD
1848*
Synchroni-
zation in
tooth pitch
(as from
SW 6)
Block change
after position
reached (as
from SW 5)
Block
change
when
synchroniz.
achieved
Division-
related FA
overlay
Suppres-
sion of
accel. limit.
Block
change with
synchro-
nism fine
Reserved Reserved
The bits below apply to following axes only and are active immediately.
Bit 7 Bit 7=1 The synchronization path of following rotary axes is limited to 1
revolution/denominator of the 1st GI link ratio. The synchronous position is
approached along the shortest path or by deceleration, depending on the
setting in MD 1856*, bit 4.
Bit 7=0 The synchronous position of following rotary axes is limited to 1 revolution .
Above half the maximum speed the synchronous position is reached by
deceleration, below half the maximum speed, along the shortest path.
Note:
If bit 4 is set in MD 1856*/531*, synchronization must never be performed when the tool or
wheel are in use.
Bit 6 Bit 6=1 Block change of a block with position-related switch on/off (G402/G400) is
delayed until the switch on/off position is reached.
Bit 6=0 Block change of a block with position-related switch on/off (G402/G400) is
performed immediately.
Bit 5 Block change after synchronization (with on-the-fly synchronization)
Bit 5=1 On-the-fly synchronization with G403: Block change only after the
synchronous position has been reached (see also PLC signal,
"Synchronous position reached").
Bit 5=0 Block change immediately, i.e., as soon as synchronization is triggered.
Synchronization does not start if PLC signal "Disable LINK ON" is active.
Bit 4 Division-related following axis overlay
Bit 4=1 Overlaid movements of the following axis are within the indexing grid.
However, any movements of the following axis caused by the leading axis
are not used to determine the set indexing position. Link and
synchronization function as before.
The following axis must be defined as an indexing axis for this function to
work. The indexing grid is defined in MD 1104* and MD 1108*.
Bit 4=0 Indexing grid ignored for overlay movements of the following axis.
6–192 © Siemens AG 1992 All Rights Reserved 6FC5197- AA50
SINUMERIK 840C (IA)