Siemens SINUMERIK 840D sl Programming Manual page 520

Axis couplings
11.3 Axial master value coupling (LEADON, LEADOF)
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 longitudinal 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,
● Deactivate coupling,
● Set actual value,
● Set marker,
● Coupling type: real/virtual master value
● Approaching axis positions,
Conditions
Fast digital inputs, real-time variables
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 controller, everything that follows a
line number constitutes a single line.
Comment
Program code
N2 $AC_MARKER[0]=0 $AC_MARKER[1]=0 $AC_MARKER[2]=0 $AC_MARKER[3]=0 $AC_MARKER[4]=0 $AC_MARKER[5]=0
$AC_MARKER[6]=0 $AC_MARKER[7]=0
N10 IDS=1 EVERY ($A_IN[1]==1) AND ($A_IN[16]==1) AND ($AC_MARKER[0]==0)
DO LEADON(X,LW,1) LEADON(YL,LW,2) LEADON(ZL,LW,3) $AC_MARKER[0]=1
N20 IDS=11 EVERY ($A_IN[1]==1) AND ($A_IN[5]==0) AND ($AC_MARKER[5]==0)
DO LEADON(U,LW,4) PRESETON(U,0) $AC_MARKER[5]=1
N21 IDS=12 EVERY ($A_IN[1]==1) AND ($A_IN[5]==0) AND ($AC_MARKER[6]==0)
DO LEADON(V,LW,4) PRESETON(V,0) $AC_MARKER[6]=1
520
LEADON(<following axis>,<leading axis>,<curve table number>)
LEADOF(<following axis>,<leading axis>)
PRESETON(<axis>,<value>)
$AC_MARKER[i]=<value>
POS[<axis>]=<value>
Comment
; Defines all static synchronized actions.
; ****Reset marker
; **** E1 0=>1 transfer ON
; **** E1 0=>1 coupling roller feed ON
; **** E1 0->1 coupling alignment head ON
; **** E1 0->1 lubrication coupling ON
and position comparisons are linked using
$AC_MARKER
Programming Manual, 03/2013, 6FC5398-2BP40-3BA1
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