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
It demonstrates how a mechanical transfer system is
replaced by an electronic transfer system. The
coupling and decoupling events are implemented as
static synchronized actions.
From the leading axis LW (stanchion shaft), transfer
axes and auxiliary axes are controlled as following
axes that are defined via curve tables.
Switching and coupling events are managed via real-
The actions that occur include, for example, the following synchronized actions:
• Activate coupling, LEADON(following axis, leading axis, curve table number)
• Deactivate coupling, LEADOF(following axis, leading axis)
• Set actual value, PRESETON(axis, value)
• Set marker, $AC_MARKER[i]= value
• Coupling type: real/virtual leading value
• Approaching axis positions, POS[axis]=value
Fast digital inputs, real-time variables $AC_MARKER and position comparisons are linked using
the Boolean operator AND for evaluation as conditions.
In the following example, line change, indentation and bold type are used for the sole purpose of
improving readability of the program. To the controller, everything that follows a line number
constitutes a single line.
Siemens AG 2000. All rights reserved
SINUMERIK 840D/840Di/810D/FM-NC Programming Guide Advanced (PGA) – 04.00 Edition
9.4 Axial leading value coupling, LEADON, LEADOF
Path Traversing Behavior
Feed or longitudinal axis
Closing or lateral axis
Roller feed, auxiliary axis
Guiding head, auxiliary axis
Greasing, auxiliary axis