734
High-speed Counter/Pulse Output Instructions Section 3-20
PLS2(887) can be executed during pulse output for ACC(888) in either inde-
pendent or continuous mode, and during acceleration, constant speed, or
deceleration. (See note.) ACC(888) can also be executed during pulse output
for PLS2(887) during acceleration, constant speed, or deceleration.
Note (1) Executing PLS2(887) during speed control with ACC(888) (continuous
mode) with the same target frequency as ACC(888) can be used to
achieve interrupt feeding of a fixed distance. Acceleration will not be per-
formed by PLS2(887) for this application, but if the acceleration rate is set
to 0, the Error Flag will turn ON and PLS2(887) will not be executed. Al-
ways set the acceleration rate to a value other than 0.
(2) The acceleration/deceleration rate can be specified as 1 Hz or higher.
There is no upper limit to the acceleration/deceleration time. If the differ-
ence between the starting speed and target speed is more than 100 kHz,
the acceleration/deceleration rate will be automatically increased.
• If the difference between the starting speed and target speed is be-
tween 100 and 200 KHz, the acceleration/deceleration rate will be 2 Hz
or higher.
• If the difference between the starting speed and target speed is be-
tween 200 and 300 KHz, the acceleration/deceleration rate will be 3 Hz
or higher.
.
.
.
.
• If the difference between the starting speed and target speed is be-
tween 900 and 1,000 KHz, the acceleration/deceleration rate will be
10 Hz or higher.
■ Independent Mode Positioning
Note Pulse output will stop immediately if the CPU Unit is changed to PROGRAM
mode.
Opera-
tion
Purpose Application Frequency changes Description Procedure/
instruction
Start-
ing
pulse
output
Com-
plex
trapezoi-
dal con-
trol
Positioning with
trapezoidal
acceleration
and decelera-
tion (Separate
rates used for
acceleration
and decelera-
tion; starting
speed)
The number of
pulses can be
changed during
positioning.
Accelerates and
decelerates at a
fixed rates. The
pulse output is
stopped when the
specified number of
pulses has been
output. (See note.)
Note The target
position
(specified
number of
pulses) can
be changed
during posi-
tioning.
PLS2(887)
Pulse frequency
Target
frequency
Starting
frequency
Acceler-
ation
rate
Specified number
of pulses
Deceleration
rate
Execution of
PLS2(887)
Target
frequency
reached.
Deceleration point
Output stops.
Stop
frequency
Time
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