Omron FQM1-MMP21, FQM1-CM001 7-4-5Application Example, Interval Timer Interrupts, Section

Interval Timer Interrupts Section 7-4

Interval timer

Ladder Program

STIM INTERVAL TIMER

•Start timer. One-shot mode Scheduled interrupt mode

•Read elapsed time.

Generate interrupt.

Execute interrupt task.

END

7-4-5 Application Example

In this example, the interval timer is used to generate an interrupt every

2.4ms (0.6 ms ⋅ 4). The default System Setup settings are used. (Inputs are not refreshed for interrupt processing.)

First Cycle Flag
(ON for 1 cycle)	MOV
	#0004
	D00010
	MOV
	#0006
	D00011
0002.00	@STIM
	#0003
	D00010
	#0023
0002.00	@STIM
	#000A
	0000
	0000
	END

Interval timer set values:

Sets 4 for the decrementing counter set value.

Sets 0.6 ms for the decrementing time interval.

The interval timer starts when CIO 0002.00 turns ON.

Task 23 hex = 35 BCD

The interval timer stops when CIO 0002.00 turns OFF.

Interrupt task 35

Interrupt task program

END

Every 2.4 ms the interval timer times out and the interrupt task is executed.

When the program is being executed, the interrupt task will be executed every 2.4 ms while CIO 0002.00 is ON, as shown in the following diagram.

CIO 0002.00

2.4 ms

2.4 ms

2.4 ms

Interrupt task

147