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Interval Timer Interrupts Section 7-4
7-4-5 Application Example
In this example, the interval timer is used to generate an interrupt every
2.4 ms (0.6 ms
× 4). The default System Setup settings are used. (Inputs are
not refreshed for interrupt processing.)
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.
Interval timer
STIM INTERVAL TIMER
Ladder Program
Generate interrupt.
Execute interrupt task.
END
• Start timer.
One-shot mode
Scheduled interrupt mode
• Read elapsed time.
First Cycle Flag
(ON for 1 cycle)
0002.00
0002.00
MOV
#0004
D00010
MOV
#0006
D00011
@STIM
#0003
D00010
#0023
@STIM
#000A
0000
0000
Interrupt task program
END
END
Interval timer set values:
Every 2.4 ms the interval timer
times out and the interrupt task is
executed.
Sets 4 for the decrementing counter
set value.
Sets 0.6 ms for the decrementing
time interval.
The interval timer stops when
CIO 0002.00 turns OFF.
The interval timer starts when
CIO 0002.00 turns ON.
Task 23 hex = 35 BCD
Interrupt
task 35
Interrupt task
CIO 0002.00
2.4 ms
2.4 ms
2.4 ms