Siemens Sinumerik 840D sl Programming Manual page 624

Motion synchronous actions
10.4 Actions in synchronized actions
Activate access with synchronized actions RELEASE
The axis to be coupled is released for synchronized action access by invoking the RELEASE
function for the axis.
Example:
RELEASE (XKAN)
ID=1 every SR1==1 to LEADON(CACH,XKAN,1)
OVW=0 (default value) )
Without a resynchronization, no new curve table can be specified for an existing coupling. A
change of the curve table requires the previous deactivation of the existing coupling and a
reactivation with the changed curve table number. This causes a resynchronization of the
coupling.
Changing the curve table for an existing coupling using OVW=1
OVW=1 can be used to specify a new curve table to an existing coupling. No
resynchronization is performed. The following axis attempts as fast as possible to follow the
position values specified by the new curve table.
Example of on-the-fly parting
An extruded material which passes continuously through the operating area of a cutting tool
must be cut into parts of equal length.
X axis: Axis in which the extruded material moves. WCS
X1 axis: Machine axis of extruded material, MCS
Y axis: Axis in which cutting tool "tracks" the extruded material
It is assumed that the infeed and control of the cutting tool are controlled via the PLC. The
signals at the PLC interface can be evaluated to determine whether the extruded material and
cutting tool are synchronized.
Actions
Activate coupling, LEADON
Deactivate coupling, LEADOF
Set actual values, PRESETON
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Programming Manual, 02/2011, 6FC5398-2BP40-1BA0
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