Mitsubishi Electric MELSEC-L02SCPU User Manual page 227

CHAPTER 8 HIGH-SPEED COUNTER FUNCTION
(a) Precautions
To restart frequency measurement after an interruption, execute Frequency measurement instruction
(ICFCNT1) after "stopped (0)" is stored in CH1 Frequency measurement flag (SD1882. b4). If another
execution command of CH1 Frequency measurement instruction (ICFCNT1) is turned on, failing to check
Frequency measurement flag (SD1882. b4), while the measurement is being executed, the command may be
ignored because the current measurement does not stop.
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