Mitsubishi MELSEC Q series User Manual page 74

(d) Number of data logging file switching times per year (DCNn)
Calculate this number with an estimated number according to the save setting of the data logging and system
operations. For example, when 1000 records are set in "Nnumber of records" of "File switching timing" in the
save setting and "Each scanning cycle" is specified for "Sampling interval" in the sampling setting, the time
interval of the file switching is obtained by multiplying the scan time by 1000. For this reason, the number of
data logging file switching times per year is obtained by the following formula: 60  60  24  365  (Scan time
(second)  1000).
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