Siemens SINUMERIK 840D Function Manual page 458

M3: Coupled axes
14.3 Master value coupling
Boundary conditions:
● No reference point is required to activate the coupling.
● A defined following axis cannot be traversed in the JOG mode (not even if the "Synchronized
run fine" or. "synchronized run coarse" interface signal is not there).
● An activated coupling must first be deactivated with LEADOF before it can be activated again
with LEADON. The settings in the following machine data are to be considered in this
connection:
MD20112 MC_START_MODE_MASK (definition of initial control system settings with NC-
START)
MD20110 $MC_RESET_MODE_MASK (definition of initial control settings after RESET/TP-
End)
Figure 14-6
Switch off
An axis master value coupling is deactivated with the model language command LEADOF.
When the axis master value coupling is deactivated, the following axis becomes the command
axis and a stop command is generated implicitly for the following axis. The stop command can
be overwritten by another command with a synchronous action.
Syntax:
LEADON(<FA>,<LA>)
458
Activating master value coupling
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA