Siemens sinumerik 840D sl Function Manual page 626

3.2 Speed/torque coupling (up to SW 5.x)
3.2.1 Axis replacement
An axis replacement can be performend considering the following restrictions:
For activating or deactivating a coupling, the channels of the master and slave axes must be
in "RESET" state. The states of the default channels of the axes are scanned prior to
activation/deactivation. At the time of activation and deactivation, the axes must be located in
the default channel assigned by MD30550. A change of axis is possible in between times,
even if the coupling is active.
3.2.2 Rotary axis modulo, spindles
Modulo rotary axes
Master and slave axes can also be rotary axes. Please note the following:
For the slave axis, the actual value in the "Diagnosis" menu, "Service" softkey, exceeds 360
degrees, even if modulo operation is set for the axis in the following machine data:.
MD30310 $MA_ROT_IS_MODULO
The automatic basic display and the service display do not show the actual value modulo
360 until the coupling is deactivated.
Spindles
If a master-slave coupling is activated with spindles, the slave axis is in speed control mode.
In this case too, the actual value of the slave axis exceeds 360 degrees in the service
display. No modulo calculation is active. However, the value shown in the automatic basic
display is modulo 360 degrees.
3.2.3 Simultaneous operation of master/slave coupling and clearance control function
The "speed/torque coupling (master-slave)" and "clearance control" functions can be
operated simultaneously with the following restriction:
An axis that is traversed by the clearance control must be neither a master nor a slave axis
in the master-slave function.
Special functions: Speed/Torque Coupling, Master-Slave (TE3)
Function Manual, 11/2006, 6FC5397-2BP10-2BA0
3.2 Speed/torque coupling (up to SW 5.x)
Constraints
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