Mitsubishi Electric Q01UCPU User Manual page 370

(d)
Maximum counting speed
The counter can count only when the on/off time of the input condition is longer than the execution interval of
the corresponding OUT C
The maximum counting speed is calculated by the following expression:
*1 Duty (n) is the ON-OFF time ratio of count input signal, and is expressed as a percentage value
When T1
When T1 < T2, n =
Count input signal
The maximum counting speed can be increased by placing multiple counters within one scan. At this time, use the direct
access input (DX
Sequence
program
(3) Precautions
(a) When counting processing is suspended
If an interrupt occurs during execution of the processing shown below, counting is suspended until the
execution of each processing is completed.
• Each instruction on the sequence program
• Interrupt program
• Fixed scan execution type program
Upon completion of the processing, the counting restarts.
However, if the same interrupt occurs again during each processing, these interrupts are counted as once.
368
instruction.
Maximum counting n
=
speed (Cmax)
100
T2
T2, n = 100%
T1+T2
T1
100%
T1+T2
ON
OFF
) ( Page 78, Section 2.8.2) for the counter input signal.
OUT OUT
END
C C
• n: Duty (%)
1
• T: Execution interval of the OUT C
[times/s]
T
(sec)
T1 T2
OUT OUT OUT
END C
C C
Execution interval of the
OUT C
*1
instruction
instruction