Omron SYSMAC CJ - REFERENCE MANUAL 08-2008 Reference Manual page 940

High-speed Counter/Pulse Output Instructions
Operation Purpose
Stopping To stop Immediate stop
pulse output pulse out-
put
To stop Immediate stop
pulse out-
put
To stop Decelerating to a
pulse out- stop
put
smoothly
Note
900
Application
Pulse frequency
Present frequency
Pulse frequency
Present frequency
Pulse frequency
Present frequency
Target frequency = 0
Execution of ACC(888)
■
Independent Mode Positioning
When independent mode operation is started, pulse output will be continued
until the specified number of pulses has been output.
The deceleration point is calculated from the number of output pulses and
deceleration rate set in S and when that point is reached, the frequency is
decreased every pulse control period (4 ms) at the deceleration rate specified
in S until the specified number of points has been output, at which point pulse
output is stopped.
1. Pulse output will stop immediately if the CPU Unit is changed to PRO-
GRAM mode.
2. The number of output pulses must be set each time output is restarted.
3. The number of output pulses must be set in advance with PULS(881).
Pulses will not be output for ACC(888) if PULS(881) is not executed first.
4. The direction set in the ACC(888) operand will be ignored if the number of
pulses is set with PULS(881) as an absolute value.
Frequency changes
Time
Execution of ACC(888) Execution of INI(880)
Time
Execution of ACC(888) Execution of SPED(885)
Acceleration/deceleration rate
(value set when starting)
Time
Execution of ACC(888)
Section 3-21
Description Procedure/
instruction
Immediately stops ACC(888)
pulse output. (Continu-
ous)
INI(880)
(Continu-
ous)
Immediately stops ACC(888)
pulse output. (Continu-
ous)
SPED(885)
(Continu-
ous, target
frequency of
0)
Decelerated pulse ACC(888)
output to a stop. (Continu-
ous)
Note If the target
frequency of
ACC(888)
the second
(Continu-
ACC(888)
ous, target
instruction is
frequency of
0 Hz, the
0)
deceleration
rate from the
first
ACC(888)
instruction
will be used.