Siemens SINUMERIK 828D Function Manual page 551

Master-slave
During the block search, only the link status should be updated without calculating the associated positions of the
coupled axis.
A system ASUB can be started automatically after the block search is finished. In this subroutine, the user can
control the link status and the associated axis positions subsequently. The information needed can be read from
additional block search system variables.
System variable for master/slave
The following system variables are needed for the position offset between the axes to be coupled with the
desired link status:
NCK variables
$P_SEARCH_MASLD[X] Slave*
$P_SEARCH_MASLC[X] Slave*
$AA_MASL_STAT[X] Slave*
Slave* for slave axis identifier
Note
This block search for the master/slave link is effective only if the position offset between the
axes can be determined.
In order to determine the programmed positions, the axes to be linked must be in the same
channel at the time of the block search. If this is not the case, the block search is aborted with
alarm 15395.
Variables $P_SEARCH_MASLD, $P_SEARCH_MASLC and $AA_MASL_STAT are cleared
on MASLON.
For further information about the master/slave link, see:
References:
/FB3/ Function Manual Special Function; Speed/Torque Coupling (TE3), Master-Slave
The system ASUB is called progevent.spf and must be available in the /_N_CMA_DIR directory. The contents
might be as follows:
progevent.spf
X=Master axis, Y=Slave axis
Programming
N10 IF(($S_SEARCH_MASLC[Y]< >0) AND ($AA_MASL_STAT[Y]< >0))
N20 MASLOF(Y)
N30 SUPA Y=$AA_IM[X]-$P_SEARCH_MASLD[Y]
N40 MASLON(Y)
N50 ENDIF
N60 REPOSA
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
K1: Mode group, channel, program operation, reset response
Description
Position offset between slave and master axis when the
link is closed.
Current status of a master/slave link was changed
during block search.
Current status of a master/slave link active.
9.8 Block search Type 5 SERUPRO
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