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(8)
Precautions for using timers
(a) Use of the same timer
Do not use the OUT T
If this occurs, the current timer value will be updated by each OUT T
incorrect time measurement.
OUT
END
T
Sequence
program
(b) When the timer is not executed in every scan
While a coil of a timer (for example. T1) is on, do not make the
part with another instruction such as CJ.
If jump of the OUT T
Also, if a timer exists in a
instruction once in each scan while the coil of the timer (for example, T1) is on.
Failure to do so will not update the current timer value.
(c) Programs that cannot use timers
Timers cannot be used in interrupt programs and fixed scan execution programs.
(d) When the set value is 0
The contact turns on when the
(e) When the set value is changed after time-out
Even if the set value is changed to a larger value after time-out of the timer, the timer remains timed-
out and does not start the operation.
instruction that describes the same timer more than once within one scan.
OUT
OUT
T
T
END
1 scan
Figure 9.27 When the same timer is used
instruction has occurred, the current timer value is not updated.
subroutine program, execute a subroutine call including the OUT T1
OUT T
instruction is executed.
instruction execution, resulting in
OUT
OUT
T
T
Current value is updated.
OUT T1 instruction jumped to any other
CHAPTER9 DEVICES
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