Mitsubishi Electric MELDAS 60 Series Programming Manual page 289

10.4.3 Key Data Processing Timing
Key data is processed at the timing shown below.
Set data in R112 only when it is necessary. Normal key operation by the operator is made
impossible.
R112
NULL
(00H)
Example)
Target key data is set.
ATC signal
ATC signal is turned on only for 100
~
100ms or longer (100 300ms is adequate.)
NULL
(00H)
If no data is set for R112, R112 is returned
to NULL (00H).
MOV H00
~
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10. PLC Help Function
R112
300ms.