Siemens sinumerik 840D sl Function Manual page 609

Detailed description
2.1 Speed/torque coupling, master-slave (SW 6 and higher)
Hardware and software limit switches
Crossing of hardware and software limit switches is detected in coupled axes; in the coupled
state, the software limit switch is generally crossed on slave axes. The alarm is output on the
slave axis, while braking is initiated via the master axis.
The path traveled after detection of the slave software limit switch equals the distance
required by the master axis to brake the coupling.
The master axis controls the movement away from the limit switch, since the coupling cannot
be disconnected until the cause of the alarm has been eliminated.
Block search
The SERUPRO "block search with calculation" function can be used without restriction in
combination with a permanent master-slave coupling in the machine data:
MD37262 $MA_MS_COUPLING_ALWAYS_ACTIVE=1 (permanent master-slave coupling)
The following restrictions apply when the coupling is programmed using MASLON and
MASLOF commands:
• The coupled axes must be in the same channel when the block search is executed. If
• The coupled axes are operated on the same NCU.
• Once the block search has been completed, the associated axis positions and speeds
$P_PROG_EVENT
This variable provides information about the event, which activated the subroutine. A value
of 5 stands for block search.
$P_SEARCH_MASLC[slave axis identifier]
The variable stands for alteration of the coupling status during a block search.
$P_SEARCH_MASLD[slave axis identifier]
This variable indicates the positional offset calculated in the block search between the slave
and master axes at the instant the coupling was closed.
$AA_MASL_STAT[slave axis identifier]
This variable indicates the current coupling status.
• The system ASUB "PROGEVENT.SPF" must be stored under
22
they are not in the same channel, the block search is aborted with alarm 15395.
must be modified subsequently by the user via a system ASUB (asynchronous
subroutine) "PROGEVENT.SPF" of the coupling status. System variables are available
for this purpose.
/_N_CMA_DIR/_N_PROG_EVENT_SPF so that it can be accessed by the control system.
Special functions: Speed/Torque Coupling, Master-Slave (TE3)
Function Manual, 11/2006, 6FC5397-2BP10-2BA0