Micrologix 1400 digital input as a counter

marcinski · Feb 20, 2014

Hi all
I have a Micrologix 1400 1766-L32BXB and I want to use one input as a pulse counter from flow meter. I don't want to use HSC to save on input points (for now)
Did anyone used it that way, and what is max pulse that digital input can keep up with without losing any pulses?

Thanks

RussB · Feb 20, 2014

That can be done. The max pulse rate will be 2 times the scan rate of the CPU. Unless that processor does interrupts on its inputs, then you can get whatever the fastest interrupt is.

geniusintraining · Feb 20, 2014

Page 29 has some info that may help

http://literature.rockwellautomation.com/idc/groups/literature/documents/in/1766-in001_-en-p.pdf

Eric Nelson · Feb 20, 2014

marcinski said:
I don't want to use HSC to save on input points (for now)

A HSC doesn't automatically use 4 input points. It depends on the mode. If you use HSC Mode 0, you only use 1 input point.

-Eric

marcinski · Feb 21, 2014

Thank You guys for pointing me right direction.
Now i know alot more than yesterday

Micrologix 1400 digital input as a counter

marcinski

Member

RussB

Lifetime Supporting Member

geniusintraining

Lifetime Supporting Member + Moderator

Eric Nelson

Lifetime Supporting Member + Moderator

marcinski

Member

Similar Topics