Pulse Input Read in PLC

Use an input that is set-up to count pulses.

Brush up on punctuation.

Your salutation is bad, too. None would have been better.

pick picky

How do these people get jobs?

You're assuming that this is job related.

A flow meter's pulse output can be a pulse representing a specific volume, for instance, 5L or 10 gallons.

The volumetric representation can generally be handled by a PLC's digital input at normal PLC scan rates. Usually the flow meter has settings such as Volume/Pulse and pulse width that are used to define what it represents and to ensure that the pulse is active long enough for the input to recognize the pulse.

Or, a flow meter's pulse output can be a pulse string (sometimes called a frequency output) that represents flow rate, for instance 5,000 pulses per second (5KHz) represents 100L/minute flow rate; with flow rate being proportional to frequency.

The pulse string or frequency output usually can not be handled by a typical PLC digital input card, but is handled by a counter I/O card or high speed counter I/O card.

You need to determine what is meant by 'pulse output' and determine whether the PLC I/O card can handle it, or whether you need a different I/O card.

sachinrmishra:

PLC normally has timer clock source, triggered monostables for delay and pulse width and counters for counting. Reset counter and then count for the desired time period and finally read the counter.

(Input)----|Timer Gate|-----|Counter|---------(Output)

(Reset Timer)-------------------^