Omron CP - PROGRAMMING MANUAL 05-2007 - Page 758

725
High-speed Counter/Pulse Output Instructions Section 3-20
Upper Limits to the Target
Frequency
Description SPED(885) starts pulse output on the port specified in P using the method
specified in M at the frequency specified in F. Pulse output will be started each
time SPED(885) is executed. It is thus normally sufficient to use the differenti-
ated version (@SPED(885)) of the instruction or an execution condition that is
turned ON only for one scan.
In independent mode, pulse output will stop automatically when the number of
pulses set with PULS(886) in advance have been output. In continuous mode,
pulse output will continue until stopped from the program.
An error will occur if the mode is changed between independent and continu-
ous mode while pulses are being output.
■ Continuous Mode Speed Control
When continuous mode operation is started, pulse output will be continued
until it is stopped from the program.
Note Pulse output will stop immediately if the CPU Unit is changed to PROGRAM
mode.
Port CP1H CP1L
X40/XA40
version 1.0
X40/XA40
version 1.1 or
higher
Y20
Port 0 100 kHz 100 kHz 1 MHz 100 kHz
Port 1 100 kHz 100 kHz 1 MHz 100 kHz
Port 2 30 kHz 100 kHz 100 kHz ---
Port 3 30 kHz 100 kHz 100 kHz ---
Target frequency
Time
SPED
(
885
)
executed.
Pulse frequency
Operation Purpose Application Frequency changes Description Procedure/
instruction
Starting
pulse out-
put
To out-
put with
speci-
fied
speed
Changing
the speed
(frequency)
in one step
Outputs pulses at
a specified fre-
quency.
SPED(885)
(Continuous)
Changing
settings
To
change
speed in
one step
Changing
the speed
during oper-
ation
Changes the fre-
quency (higher or
lower) of the
pulse output in
one step.
SPED(885)
(Continuous)
↓
SPED(885)
(Continuous)
Pulse frequency
Target frequency
Execution of SPED(885)
Time
Pulse frequency
Target frequency
Present frequency
Execution of SPED
(
885
)
Time