
8.CONTROL FUNCTION LASER FUNCTION B-64663EN/01
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Controlled axes
The following conditions apply to the controlled axes.
1 Either an incremental pulse coder or absolute pulse coder (APC)
can be used for a controlled axis. The two types can be used in
one system; it is allowed to use an incremental for one controlled
axis and an absolute for another.
2 The U-axis can be assigned to any axis from the fourth to the
eighth. Which axis to use is specified using parameter No.
15703.
3 Because the U-axis move command is determined from the move
distance of an axis on which the optical path length varies, a
controlled axis (except the U-axis) on which the optical path
length changes is specified in parameter No. 15700.
4 If the move direction of an axis on which the optical path length
changes does not match the polarity of the change in the optical
path length, the polarity can be inverted using parameter No.
15701 for calculation purposes.
5 Parameter No. 15702 can specify whether to reflect the move
amount of a controlled axis under tracing control in the move
command for the U-axis.
6 Optical path length compensation is available.
The optical path length with all axes (including the U-axis) at the
reference position is regarded as the reference optical path length.
This optical path length can be compensated for error. As a result,
the reference optical path length can be set up regardless of
where the reference position is set up.
If parameter No. 15704 specifies a mirror position compensation
value, setting the optical path length compensation start signal
(LRCS) to "1" with all axes at the reference return position
causes the U-axis to shift automatically from the reference
position by the specified distance, then triggers optical path
length compensation.
For the APC axis, even if it has not returned to the reference
position, the LRCS signal is accepted provided that the reference
position has been established.