Siemens sinumerik 840d Programming Manual page 320

Path Traversing Behavior
9
9.4 Axial leading value coupling, LEADON, LEADOF
840D 840D
NCU 571 NCU 572
NCU 573
Sequence
Leading value coupling requires synchronization of
the leading and the following axes. This
synchronization can only be achieved if the following
axis is inside the tolerance range of the curve
definition calculated from the curve table when the
leading value coupling is activated.
The tolerance range for the position of the following
axis is defined via machine data 37200
COUPLE_POS_TOL_COARSE.
If the following axis is not yet at the correct position
when the leading value coupling is activated, the
synchronization run is automatically initiated as soon
as the position setpoint value calculated for the
following axis is approximately the real following axis
position. During the synchronization procedure the
following axis is traversed in the direction that is
defined by the setpoint speed of the following axis
(calculated from master spindle and CTAB).
Additional notes
If the following axis position calculated moves away
from the current following axis position when the
leading value coupling is activated, it is not possible
to establish synchronization.
Actual value and setpoint coupling
The following can be used as the leading 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
coupling
9-320
810D 840Di
SINUMERIK 840D/840Di/810D/FM-NC Programming Guide Advanced (PGA) – 04.00 Edition
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Following axis position
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