Omron CP - PROGRAMMING MANUAL 05-2007 - Page 775

742
High-speed Counter/Pulse Output Instructions Section 3-20
• 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.
■ Continuous Mode Speed Control
Pulse output will continue until it is stopped from the program.
Note Pulse output will stop immediately if the CPU Unit is changed to PROGRAM
mode.
Operation Purpose Application Frequency changes Description Procedure/
instruction
Starting
pulse out-
put
To output
with speci-
fied accel-
eration
and speed
Accelerat-
ing the
speed (fre-
quency) at a
fixed rate
Outputs pulses and
changes the frequency
at a fixed rate.
ACC(888) (Con-
tinuous)
Changing
settings
To change
speed
smoothly
Changing
the speed
smoothly
during oper-
ation
Changes the frequency
from the present fre-
quency at a fixed rate.
The frequency can be
accelerated or deceler-
ated.
ACC(888) or
SPED(885)
(Continuous)
↓
ACC(888) (Con-
tinuous)
Changing
the speed in
a polyline
curve during
operation
Changes the accelera-
tion or deceleration rate
during acceleration or
deceleration.
ACC(888) (Con-
tinuous)
↓
ACC(888) (Con-
tinuous)
Stopping
while
changing
the speed
The deceleration rate is
changed while stopping.
Note When the target
frequency is
changed to 0 Hz,
the current decel-
eration rate will
continue to be
used.
ACC(888) (Con-
tinuous)
↓
ACC(888) (Con-
tinuous)
↓
ACC(888) (Con-
tinuous, target
frequency of 0)
Pulse frequency
Target frequency
Present frequency
Acceleration/
deceleration
rate
Execution of ACC(888)
Time
Pulse frequency
Target frequency
Present frequency
Acceleration/
deceleration
rate
Execution of ACC(888)
Time
Pulse frequency
Target frequency
Present frequency
Acceleration rate n
Acceleration
rate 2
Acceleration
rate 1
Execution of ACC(888)
Execution of ACC(888)
Execution of ACC(888)
Time
Present frequency
Acceleration/
deceleration rate 1
Pulse frequency
Target frequency = 0
Acceleration/
deceleration rate 2
Time
Execution of
ACC(888)
Execution of
ACC(888)
Execution of ACC(888)
(target frequency = 0)