Omron FQM1-CM001, FQM1-MMA21, FQM1-MMP21 Pulse Outputs, Section, Changing the Frequency in Steps

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.

Frequency

Target frequency 50,000 Hz

Present frequency 3,000 Hz

0002.00

0002.01

						Time
SPED executed.	SPED executed.
			@SPED			When CIO 0002.00 turns ON,
					#2	SPED starts a pulse output from
					#1	port 2 at 3,000 Hz (3 kHz) in
			#00000BB8			CCW continuous mode.
			@SPED			When CIO 0002.01 turns ON,
					#2	SPED changes the frequency
					#1	to 50,000 Hz (50 kHz) in CCW
				D00000		continuous mode.
D00000	C	3	5	0	Target frequency
D00001	0	0	0	0

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.

Frequency
Target frequency
50,000 Hz	Acceleration rate
	500 Hz/2 ms
Present frequency
3,000 Hz							Time
	SPED executed.		ACC executed.
0002.00
					@SPED		When CIO 0002.00 turns ON,
						#2	SPED starts a pulse output from
						#1	port 2 at 3,000 Hz (3 kHz) in
						#00000BB8	CCW continuous mode.
0002.01
					@ACC		When CIO 0002.01 turns ON, ACC is
						#2	executed in mode 1 (CCW direction,
						#1	acceleration, and continuous mode) to
						D00000	accelerate the frequency at 500 Hz/2 ms
							to 50,000 Hz (50 kHz).
	D00000	0	1	F	4	Acceleration rate
	D00001	C	3	5	0	Target frequency
	D00002	0	0	0	0

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