Siemens SINUMERIK 840D sl Programming Manual page 519

The leading axis is the axis which supplies the input values for the curve table. The following
axis is the axis, which takes the positions calculated by means of the curve table.
Actual value and setpoint coupling
The following can be used as the master value, i.e. as the output values for position
calculation of the following axis:
● Actual values of the leading axis position: Actual value coupling
● Setpoints of the leading axis position: Setpoint value coupling
The master value coupling always applies in the basic coordinate system.
For information on the creation of curve tables, see Section "Curve tables".
Syntax
LEADON(<following axis>,<leading axis>,<n>)
LEADOF(<following axis>,<leading axis>)
or deactivation without specifying the leading axis:
LEADOF(<following axis>)
The master value coupling can be activated/deactivated both from the part program and also
during motion from synchronized actions.
Meaning
LEADON
LEADOF
<following axis>
<leasing axis>
<n>
$SA_LEAD_TYPE
Deactivate master value coupling, LEADOF
When you deactivate the master value coupling, the following axis becomes a normal
command axis again!
Axial master value coupling and different operating states, RESET
Depending on the setting in the machine data, the master value couplings are deactivated
with RESET.
Example of master value coupling from synchronous action
In a pressing plant, an ordinary mechanical coupling between a leading axis (stanchion
shaft) and axis of a transfer system comprising transfer axes and auxiliary axes is to be
replaced by an electronic coupling system.
It demonstrates how a mechanical transfer system is replaced by an electronic transfer
system. The coupling and decoupling processes are implemented as static synchronized
actions.
Job Planning
Programming Manual, 03/2013, 6FC5398-2BP40-3BA1
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11.3 Axial master value coupling (LEADON, LEADOF)
Activate master value coupling
Deactivate master value coupling
Following axis
Leading axis
Curve table number
Switching between setpoint and actual value coupling
Axis couplings
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