Siemens SINUMERIK 840D sl Programming Manual page 527

Variant 3:
The parameters correspond to those of variant 2 plus:
Approach mode
Variant 3 only affects modulo following axes that are coupled to modulo leading axes. Time
optimization takes account of velocity limits of the following axis.
Further Information
Description of the switch-in versions
Version 1:
The positions of the leading axes and following axis at the instant the grouping is switched
on are stored as "Synchronized positions". The "Synchronized positions" can be read with
the system variable
Version 2:
If modulo axes are contained in the coupling group, their position values are modulus-
reduced. This ensures that the next possible synchronized position is approached (so-called
relative synchronization
approached if "Enable following axis override" interface signal DB(30 + axis number), DBX
26 bit 4 is issued for the following axis. If it is not issued, the program stops at the
EGONSYN block and self-clearing alarm 16771 is output until the above mentioned signal is
set.
Version 3:
The tooth distance (deg.) is calculated like this: 360 * Zi/Ni. If the following axis is stopped at
the time of calling, path optimization returns responds identically to time optimization.
If the following axis is already in motion,
irrespective of the current velocity of the following axis. If the following axis is already in
motion,
following axis. The axis is also decelerated, if necessary.
Job Planning
Programming Manual, 03/2013, 6FC5398-2BP40-3BA1
The following modes can be used:
"NTGT"
"NTGP"
"ACN"
"ACP"
"DCT"
"DCP"
$AA_EG_SYN
: e.g. the next tooth gap). The synchronized position is only
will synchronize at the next tooth gap depending on the current velocity of the
NTGT
Approach next tooth gap time-optimized
Approach next tooth gap path-optimized
Traverse rotary axis in negative direction absolute
Traverse rotary axis in positive direction absolute
Time-optimized for programmed synchronous position
Distance-optimized to the programmed synchronous
position
.
will synchronize at the next tooth gap
NTGP
Axis couplings
11.4 Electronic gear (EG)
527