Siemens SINUMERIK 840D sl Programming Manual page 601

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.
From the leading axis LV (stanchion shaft), transfer axes and auxiliary axes are controlled as
following axes that are defined via curve tables.
Following axes
X feed or master value axis
YL closing or transverse axis
ZL lifting axis
U roll feed, auxiliary axis
V guide head, auxiliary axis
W greasing, auxiliary axis
Actions
The actions that occur include, for example, the following synchronized actions:
● Activate coupling, LEADON(following axis, leading axis, curve table
● Deactivate coupling, LEADOF(following axis, leading axis)
● Set actual value, PRESETON(axis, value)
● Set marker, $AC_MARKER[i]= value
● Coupling type: real/virtual master value
● Approaching axis positions, POS[axis]=value
Conditions
Fast digital inputs, real-time variables $AC_MARKER and position comparisons are linked
using the Boolean operator AND for evaluation as conditions.
Note
In the following example, line change, indentation and bold type are used for the sole
purpose of improving readability of the program. To the control, everything that follows a line
number constitutes a single line.
Job Planning
Programming Manual, 06/2009, 6FC5398-2BP20-0BA0
number)
9.3 Axial leading value coupling (LEADON, LEADOF)
Axis couplings
601