Siemens sinumerik 840D sl Function Manual page 607

Detailed description
2.1 Speed/torque coupling, master-slave (SW 6 and higher)
Weight counterbalance
The additional torque for the electronic weight counterbalance
MD32460 $MA_TORQUE_OFFSET
is computed in the slave axis irrespective of the coupling status.
Gear stage change with active master-slave coupling
An automatic gear stage change in a coupled slave spindle is not possible and can only be
implemented indirectly using the master spindle. The point in time at which the gear stage is
changed is then derived from the master spindle. The oscillating motion of the coupled slave
spindle is generated implicitly via the oscillating motion of the master spindle.
in contrast to the master spindle, the associated parameter block must be explicitly selected
in the coupled slave spindle. To enable the parameter block to be specified, the following
machine data must be set to the value 2:
MD35590 $MA_PARAMET_CHANGE_ENABLE
In the event of a gear stage change for the master/slave spindle, the associated parameter
set index can be activated by the PLC via the VDI interface.
Note
For more information about gear stage change and parameter sets for changes in spindle
mode, see:
References:
/FB1/ Description of Functions, Basic Functions; Spindles (S1)
/FB1/Function Manual Basic Functions; Various Interface Signals (A2)
Interface signals from/to axis/spindle
Axis container
If a coupled slave axis is configured in an axis container, alarm "4025 Switch axis container
%3 not permitted: Master-slave active channel %1 Axis %2" is output. The axis container
may not be advanced because the coupling is active.
SW 6.4 and higher
In the event that masters change, dynamic configuration can be used to match the relevant
spindle the master spindle following a rotation of the axis container. Both master and slave
spindles can be container spindles.
For a coupling to be closed after container rotation using a different spindle in each case, the
old coupling must be disconnected before the rotation, the configuration deleted and the new
coupling closed after the rotation.
20
Special functions: Speed/Torque Coupling, Master-Slave (TE3)
Function Manual, 11/2006, 6FC5397-2BP10-2BA0