Omron CP - PROGRAMMING MANUAL 05-2007 Programming Manual page 775

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