Toshiba LF620F Instruction Manual page 128

Note: When the one-shot pulse output function is selected, if its pulse width is large compared
with the update period of the preset value. The output stays ON. To make sure to output as
one-shot pulse, set the preset value reach interval to be 2 signals or more of the pulse width
setting value.
Preset Pulse The Interval of that Totalizer
Width reaches the Preset Point
50ms More than 100ms
500ms More than 1000ms
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Example) Count rate:0.01 l
Flow verosity:10 l/s
Totalizer count up rate:1ms/COUNT
Preset Count: more than 100
Preset Count: more than 1000
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6 F 8 A 0 9 2 8