Set Actual Values (Preseton) - Siemens SINUMERIK 840D sl Programming Manual

10.4.19

Set actual values (PRESETON)

Function
When PRESETON (axis, value) is executed, the current axis position is not changed but a
new value is assigned to it.
PRESETON from synchronized actions can be programmed for
● modulo rotary axes that have been started from the part program and
● all command axes that have been started from a synchronized action
Syntax
DO PRESETON(axis, value)
Significance
DO PRESETON
Axis
Value
Restrictions for axes
PRESETON cannot be programmed for axes, which are involved in a transformation.
One and the same axis can by moved from the part program and from a synchronized
action, only at different times. For this reason, delays can occur in the programming of an
axis from the part program if the same axis has been program in a synchronized action first.
If the same axis is used alternately, transfer between the two axis movements is
coordinated. Part program execution must be interrupted for that.
Example
Moving the control zero of an axis
Program code
WHEN $AA_IM[a] >= 89.5 DO PRESETON(a4,10.5)
Job Planning
Programming Manual, 06/2009, 6FC5398-2BP20-0BA0
Setting actual values in synchronized actions
Axis of which the control zero is to be changed
The value by which the control zero is to be changed
Motion synchronous actions
10.4 Actions in synchronized actions
Comments
; Shift the control zero of the
axis a through 10.5 length units
(inch or mm) in the positive
axis direction
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