S900 D910 - scaling the raw value

Hello,

i got a question in terms of the measuring range adjustment of a DP910 S900 I/O Card with a Melody System.
We use the card for measuring the rotational speed of a pump. We have 6 pulses per revolution. The pump has a max speed of 135 1/min = 2.25Hz.
The manual says, that you have to divide the DINT value by 10.000. But how can i adjust the value when having more or less pulses per revolution.