
B–63503EN–1/01
7. FEEDRATE CONTROL/ACCELERATION
AND DECELERATION CONTROL
303
CAUTION
1 When the total distance for the blocks under Look–ahead
control is equal to or less than the deceleration distance
from the current feedrate, deceleration starts. When
Look–ahead control has proceeded upon the completion of
deceleration, and the total distance for the blocks
increases,acceleration starts. Especially, when a series of
blocks containing very small amounts of travel are specified,
deceleration and acceleration may be alternated, which
prevents the feedrate from becoming constant. In such a
case, specify a lower feedrate.
2 When the dry run signal is inverted from 0 to 1 or from 1 to
0 during movement along an axis, the speed of movement
is increased or reduced to a specified speed without first
being reduced to zero.
3 When a no–movement block or a one–shot G code such as
G04 is encountered in Look–ahead control (Multiple blocks
are read in advance) mode, the movement is decelerated
and halted in the preceding block.
NOTE
1 As acceleration after interpolation, use linear acceleration.
Exponential acceleration/deceleration cannot be used.
2 Upon switching to Look–ahead control (Multiple blocks are
read in advance) mode, all manual handle interrupts are
ignored.
OPERATOR’S MANUAL
(For Machining Center)
(B–63514EN)
Look–ahead control (Multiple blocks are read in advance)
Caution
Note
Reference item