Omron FQM1-CM001, FQM1-MMA21, FQM1-MMP21 Virtual Pulse Output Function, Section, Description

Virtual Pulse Output Function				Section 7-8
Address	Name	Description	Setting range		Set/
					monitored
T+5 to T+6	Target position	Set the number of virtual output	Relative mode:		Set
	(8-digit hexadecimal)	pulses here.	0000 0000 to FFFF FFFF		(Read/
			Absolute mode:		Write)
			8000 0000 to 7FFF FFFF
T+7 to T+8	Target frequency	Set the target frequency of vir-	0000 0001 to 000F 4240 hex
	(8-digit hexadecimal)	tual pulses here.	(0 to 1 MHz in 1-Hz units)
T+9 to T+10	Starting frequency	Set the starting frequency of vir-	0000 0000 to 000F 4240 hex
	(8-digit hexadecimal)	tual pulses here.	(0 to 1 MHz in 1-Hz units)
T+11	Acceleration rate	Set the acceleration rate of vir-	0001 to 270F
	(4-digit hexadecimal)	tual pulses here.	(1 to 9,999 Hz, in 1-Hz units)
T+12	Deceleration rate	Set the deceleration rate of vir-	0001 to 270F
	(4-digit hexadecimal)	tual pulses here.	(1 to 9,999 Hz, in 1-Hz units)
T+13 to T+26	Work area	Used by the system.			---
Description	• Use the AXIS instruction with an input condition that is ON for one cycle.
		AXIS cannot be used as a differentiated instruction (the @ prefix is not
		supported).

•AXIS is executed at the rising edge of the input condition. If the input remains ON, the virtual pulse output continues until the target position is reached. Once the target position is reached, the virtual pulse output is stopped. If the input condition goes OFF during the virtual pulse output, the output stops at that point.

•The AXIS instruction’s mode specifier operand (M) specifies whether the virtual pulse output operates in relative or absolute mode.

•In relative mode, the internal pulse counter initializes the internal pulse count to 0 when AXIS is executed and starts incrementing from 0.

•In absolute mode, the internal pulse counter retains the internal pulse count when AXIS is executed and starts incrementing or decrementing from that existing pulse count.

•The internal pulse counts are refreshed every cycle at the interval speci- fied in the calculation cycle (2 ms, 1 ms, or 0.5 ms) on the condition that the cycle time is constant. If the specified calculation cycle time does not match the execution cycle time, the time difference between the cycles can cause an error in the count. If highly accurate pulse counts are required, use the constant cycle time function and match the execution cycle time and calculation cycle time. (Set the constant cycle time in the System Setup’s Cycle Time Tab Page.)

•When trapezoidal control cannot be performed with the specified target position, target frequency, and acceleration/deceleration, AXIS will auto- matically compensate as follows:

The acceleration and deceleration rates will be set to the same rate (symmetrical trapezoidal control).

OR

When one-half of the specified target pulses have been output, AXIS will start decelerating the operating axis at the same rate as accelera- tion (symmetrical triangular control).

Note When the AXIS instruction’s input condition goes OFF, the contents of setting table words T+2 to T+4 will be initialized to 0.

214