
B–63503EN–1/01
7. FEEDRATE CONTROL/ACCELERATION
AND DECELERATION CONTROL
295
In rapid traverse, acceleration/deceleration is performed using linear
acceleration/deceleration before interpolation, and tool movement is
performed by positioning based on linear interpolation. The tool
movement feedrate is obtained from the rapid traverse rate for each axis
which is set in parameter 1420. The acceleration in
acceleration/deceleration before interpolation is obtained from the rapid
traverse rate for each axis which is set in parameter 1420 and the linear
acceleration/deceleration time constant for each axis in rapid traverse
which is set in parameter 1620. They are obtained as follows:
(1)Tool movement feedrate
For each axis along which the tool moves, calculation is performed
using the following expression. Then, from among the calculated
values, the smallest value is used as the tool movement feedrate.
Rapid traverse rate on an axis (parameter 1420)
Amount of travel for a block
Amount of travel along an axis
(2)Acceleration in linear acceleration/deceleration before interpolation
For each axis along which the tool moves, calculation is performed
using the following expression. Then, from among the calculated
values, the smallest value is used as the acceleration in linear
acceleration/deceleration before interpolation during movement.
Rapid traverse rate on an axis (parameter 1420)
Time constant for an axis (parameter 1620)
Amount of travel for a block
Amount of travel along an axis
NOTE
Any overlap of rapid traverse blocks is invalid.
[Classification] Output signal
[Function] This signal indicates that the system is in Look–ahead control (Multiple
blocks are read in advance) mode.
[Output condition] The signal is set to 1 when:
D The system is in Look–ahead control (Multiple blocks are read in
advance) mode.
The signal is set to 0 when:
D The system is in other than Look–ahead control (Multiple blocks are
read in advance) mode.
Rapid traverse
Signal
Look–ahead control
(Multiple blocks are read
in advance) mode signal
SHPC <F062#0>