plc omron CQM1H CPU-11

I want to ask about plc omron CQM1H CPU-11 ladder diagram, in my ladder diagram i found a word "DIFU". That i want to know are: what the functions? and the definition?. THANK YOU FOR YOUR ANSWER.

-------[]----------[/]--------------------(DIFU)
inverter trip reset

DIFU stands for "Differentiate UP' -

The bit is turned ON for 'one cycle'(one scan duration of the plc) on the rising edge of the input signal.

Chavak's answer should be enough, but if you're still confused, have a look at Phil's Explanation <-- Click me

beerchug

-Eric

I started to post a reply, but Phil's explanation is superb. I couldn't say it better.