Siemens SINUMERIK 840D sl Function Manual page 408

S9: Setpoint switchover
7.2 Startup
Transfer conditions
• Axis standstill of all axes involved.
• Special functions such as reference point approach, measuring, travel to fixed stop,
function generator, star/delta changeover, drive parameter set changeover are not active
in the axis with drive control.
• No sign-of-life error and no faults pending on PROFIBUS drive.
The PLC interface provides constant information about the current state of the exchange. At
any one time, only one axis has drive control DB31, ... DBX96.5=1.
During exchange, servo enables on all axes involved are automatically withdrawn by the
control.
Axes without drive control are not in closed-loop control. Therefore, a brake control must be
set up for vertical axes.
Special cases
If a number of transfer requests are made simultaneously, exchange will not take place. The
last axis used remains in control of the drive. This is also the case if there are no transfer
requests pending.
If there are no transfer requests during machine power-up, drive control is assigned to the first
machine axis located with the same logical drive number. The interface signal
DB31, ... DBX24.5 (change setpoint output assignment) must be set explicitly in advance to
be able to traverse the axis. Logical drive numbers are scanned in ascending order.
MD30110 $MA_CTRLOUT_MODULE_NR[0,AX1] = 1
MD30110 $MA_CTRLOUT_MODULE_NR[0,AX2] = 2
MD30110 $MA_CTRLOUT_MODULE_NR[0,AX3] = 3
MD30110$MA_CTRLOUT_MODULE_NR[0,AX4] = 4 ; Drive control during power-up
MD30110 $MA_CTRLOUT_MODULE_NR[0,AX5] = 4
408
Function Manual, 09/2011, 6FC5397-2BP40-2BA0
Special Functions