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MELSEC-Q
8 PROGRAMMING
POINT
When values are read by the REMFR instruction in a cycle close to the cycle of the
periodic pulse counter function, the periodic pulse count previous and present
values may be the same even after they were reread.
In that case, review the sequence program so that the read cycle by the REMFR
instruction becomes about the half of the cycle of the periodic pulse counter
function.
Values are read by the REFMR instruction in a cycle nearly the same as the rising
cycle of the REMFR instruction completion device (M220 in the program example).
Calculate the rising cycle by integrating current scan time (SD520, SD521) during
which the completion device turns off and on in the sequence program every scan.