Omron CP - PROGRAMMING MANUAL 05-2007 Programming Manual page 776

High-speed Counter/Pulse Output Instructions
Operation Purpose Application
Stopping To stop Immediate
pulse out- pulse out- stop
put put
To stop Immediate
pulse out- stop
put
To stop Decelerat-
pulse out- ing to a stop
put
smoothly
Note
Frequency changes
Pulse frequency
Present frequency
Execution of ACC(888)
Pulse frequency
Present frequency
Execution of ACC(888) Execution of SPED(885)
Pulse frequency
Present frequency
Target frequency = 0
1st 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.
Immediately stops pulse
output.
Time
Execution of INI880)
Immediately stops pulse
output.
Time
Pulse output is deceler-
ated to stop.
Note If the target fre-
Acceleration/
deceleration rate
(value set when
starting)
Time
2nd execution of
ACC(888)
Section 3-20
Description Procedure/
instruction
ACC(888) (Con-
tinuous)
INI(880) (Contin-
uous)
ACC(888) (Con-
tinuous)
SPED(885)
(Continuous, tar-
get frequency of
0)
ACC(888) (Con-
tinuous)
quency of the 2nd
ACC(888) (Con-
execution of
tinuous, target
ACC(888) is 0 Hz,
frequency of 0)
then the deceler-
ation rate of the
1st ACC(888) will
be used.
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