1756-OF8 Scaling

I am installing a 1756-OF8 that is going to control a proportional valve that takes a 4-20mA signal. The manual does a pretty good job of explaining this but I am still confused.

The pid that generates the signal is scaled in units from 0 - 32767. According to the manual the card uses 0-4096 counts. So I set the module properties as follows.

High signal = 20mA
Low signal = 4mA

High Engineering = 32767
Low Engineering = 0.0

If I am reading correctly when I move 32767 into the channel data it will convert that into 4096 counts and put out 20mA, If I move 0 into the data channel it will put out 4mA.

Am I correct in assuming the configuration of the module takes care of the 'counts' and I don't have to worry about them, or do I have to convert my Engineering units into counts?

This should be an easy question but I am new to CLX and learning on the fly.

I believe you'll be OK. It's been a while, but I've used OF8 modules in the past and had a 0-10V output scaled for 0-5000 engineering units. I'm not sure what that 0-4096 counts applies to or where that came from.

Logix5000 has a bit of a learning curve to it, but I think you'll like it in the long run.

R

I wouldn't worry about the module's resolution unless you need more granularity.
The 1756-OF8 provides 12 bits of channel signal resolution(0-4096) and this is a pretty common implementation within the analog world.
The module itself will "scale" the 16-bit resolution (0-32767) engineering units "command" into the proper 12-bit count "signal" according to the user defined module scaling.

Perfect guys thanks, that is what I thought but I wanted to confirm. I'll have another post here shortly about controlling a PID that another guy started to implement and never finished.