
B–63610EN/01
4. DESCRIPTION OF PARAMETERS
85
NOTE
When 0 is set in parameter No.1770 or parameter No.1771,
linear acceleration/deceleration before interpolation is
disabled.
1771 Parameter 2 (for look–ahead control) for setting an acceleration for linear ac-
celeration/deceleration before interpolation (time used to reach the maximum
machining speed during linear acceleration/deceleration before interpolation)
[Data type] Word
[Unit of data] 1 msec
[Valid range] 0 to 4000
This parameter is used to set an acceleration for linear acceleration/
deceleration before interpolation in the look–ahead control mode. In this
parameter, set the time (time constant) used toreach the speed set in
parameter No.1770.
NOTE
1 When 0 is set in parameter No.1770 or parameter No.1771,
linear acceleration/deceleration before interpolation is
disabled.
2 In parameter Nos. 1770 and 1771, set values that satisfy the
following:
Parameter No.1770/Parameter No.1771 y 5
1777
Minimum speed for the automatic corner deceleration function (look–ahead control)
[Data type] Word
[Unit of data, valid range]
Valid data range
ncremen
sys
em
n
o
a
a
IS-A, IS-B IS-C
Millimeter machine 1 mm/min 6 to 15000 6 to 12000
Inch machine 0.1 inch/min 6 to 6000 6 to 4800
Set a speed at which the number of buffered pulses in deceleration is
assumed to be 0 when linear acceleration/deceleration before
interpolation is used.
1779
Critical angle subtended by two blocks for automatic corner deceleration (for
look–ahead control)
[Data type] 2–word
[Unit of data] 0.001 deg
[Valid data range] 0 to 180000
Set a critical angle to be subtended by two blocks for corner deceleration
when the angle–basedautomatic corner deceleration function is used.
The angle subtended by two blocks is defined as θ in the examples shown
below.