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5 POSITIONING CONTROL
5.17 Continuous Trajectory Control
• The fixed acceleration/deceleration time method is acceleration/deceleration processing that the time which
acceleration/deceleration takes is fixed, even if the command speed differs.
(1) Rapid stop deceleration time in parameter block, completion point specification method for speed change
point, and S-curve acceleration/deceleration processing and parameters are invalid in the fixed acceleration/
deceleration time method.
(2) The speed processing for each axis is as shown below in positioning operation (continuous trajectory) as
shown in the following figure.
• When the rapid stop command is executed by the setting "deceleration time < rapid stop deceleration time"
during continuous trajectory control, the point data currently executed in the middle of deceleration, and the
positioning may be completed suddenly as a speed "0".
In the case of, "deceleration time
rapid stop deceleration time", the above operation is not executed. For
the following condition, note that the speed may become 0 in the middle of deceleration.
Travel value by the point data currently executed at the rapid stop command (Up to 9 points) < speed at rapid
stop command input
rapid stop deceleration time / 2
[Operation pattern]
V
t
Acceleration/deceleration time is fixed
Y
Axis 1
Axis 2
Address Ax
Positioning operation
X
Ax
Ay
Address Ay
t
V
V
Axis 1
Axis 2
Ay
t
Continuous-trajectory control processing of each axis
Ax
Positioning complete
signal
Rapid stop command
Deceleration speed at
the normal stop
Vector speed
OFF
ON
OFF
OFF
ON
Start accept flag
(8)
(7)
(6)
(5)
(4)
(3)
(2)
(1)
ON
Summary of Contents for MELSEC iQ-R16MTCPU
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