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Pulse Outputs Section 7-6
Changing the Frequency in Steps
In this example, the SPED(885) instruction is used to change the speed of a
pulse output from port 2 from a frequency of 3,000 Hz to 50,000 Hz. In this
case, the pulse output is a CCW continuous mode output.
Note Speed control timing will be accurate when frequency changes are executed
by SPED(885) instructions in interrupt tasks called by input interrupts.
Accelerating the Frequency at a Fixed Rate
In this example, the ACC(888) instruction is used to accelerate the pulse out-
put from port 2 from a frequency of 3,000 Hz to 50,000 Hz at an acceleration
rate of 500 Hz/2 ms.
D00000 C 3 5 0
D00001 0 0 0 0
@SPED
#2
#1
#00000BB8
0002.00
@SPED
#2
#1
D00000
0002.01
Frequency
Target frequency
50,000 Hz
SPED executed. SPED executed.
When CIO 0002.00 turns ON,
SPED starts a pulse output from
port 2 at 3,000 Hz (3 kHz) in
CCW continuous mode.
When CIO 0002.01 turns ON,
SPED changes the frequency
to 50,000 Hz (50 kHz) in CCW
continuous mode.
Target frequency
Present frequency
3,000 Hz
Time
@SPED
#2
#1
#00000BB8
0002.00
@ACC
#2
#1
D00000
0002.01
D00000
1F4
D00001 3 5 0
D00002
0000
0
C
Frequency
Target frequency
50,000 Hz
SPED executed. ACC executed.
When CIO 0002.00 turns ON,
SPED starts a pulse output from
port 2 at 3,000 Hz (3 kHz) in
CCW continuous mode.
When CIO 0002.01 turns ON, ACC is
executed in mode 1 (CCW direction,
acceleration, and continuous mode) to
accelerate the frequency at 500 Hz/2 ms
to 50,000 Hz (50 kHz).
Target frequency
Present frequency
3,000 Hz
Time
Acceleration rate
500 Hz/2 ms
Acceleration rate