Siemens SINUMERIK 840D sl Function Manual page 628

TE3: Speed/torque coupling, master-slave
16.8 Supplementary conditions
The movement away of the slave axis from the limit switch must be performed via the traversing
of the master axis. Switching off the coupling (MASLOF) and traversing the slave axis is not
possible. The coupling cannot be switched off until the cause of the error has been removed.
NOTICE
Power Off/On or warm restart (reset (po)) after overtravel of the software or hardware limit
switch and switching off the coupling with MASLOF
If the software or hardware limit switch is overtraveled by a slave axis and an attempt is made
to switch off the coupling with MASLOF while the slave axis is still behind the limit switch, the
message "Waiting for coupled slave axis" is displayed. The coupling can only be switched off
by means of a Power Off/On or warm restart (reset (po)).
Block search
Static coupling
The "Block search with calculation" function (SERUPRO) can be used without any restrictions
in conjunction with a static master-slave coupling.
Dynamic coupling (only 840D sl)
For a dynamic coupling, the following restrictions must be observed with regard to the program
commands MASLON and MASLOF:
● The coupled axes must be on the same NCU.
● The coupled axes must be in the same channel when the block search is executed.
● After the block search has been completed, the coupling state, the associated axis positions
and speeds must be subsequently influenced by the user via the system ASUB
"PROGEVENT.SPF". System variables are available for this purpose.
– $P_PROG_EVENT: This variable provides information about the event which activated
– $P_SEARCH_MASLC[slave axis name]: This variable stands for alteration of the
– $P_SEARCH_MASLD[slave axis name]: This variable indicates the positional offset
– $AA_MASL_STAT[slave axis name]: This variable indicates the current coupling state.
628
the subprogram. A value of 5 stands for block search.
coupling status during a block search.
calculated in the block search between the slave and master axes at the instant the
coupling was closed.
Function Manual, 01/2015, 6FC5397-2BP40-5BA2
Special functions