PLC Converting encoder pulses to hmi display

[plcjunior]

I have an application where i am using a slc 5/05 controller. i have a quadrature encoder connected to a high speed counter. I have to transfer the pulses recieved from the encoder to diplay line speed on my hmi in ft/min. The encoder is tracking material at various line speeds. Is there a function in the rs logix 500 software that can convert the pulses? or what can be done to achieve this. Id sure appreciate the help.

 

[NWBeaver]

I am not aware of any function for making the conversion, but this seems like a fairly easy task, by simply counting the pulses during a specific time interval, and then doing the math.

(x pulses/sec.)(y ft./pulse)= z ft./sec

 

[artecerv]

The only thing you need to know is the relation between encoder revolution and linear travel. Encoders are normally coupled to machinery by pulleys, gear boxes, wheels, etc...

ratio(ft/rev) x encoder(rev/pulses) x Period (pulses/sec)

The period (1/frequency) can be calculated on-line by measuring the time between pulses (or revolution, set of pulses, etc) ...