PT100 with Allen Bradley 830 Series

Hi chaps,

I was wondering if you guys would be able to help me or steer me in the right direction. The current setup I have is:

Allen Bradley 830 PLC
2080-RTD2 expansion board
PT100 Temperature Probe

I am using the PID function block, but the values I'm getting back from the PT100 aren't something I can interpret. For approximately 19 degrees I'm getting a value of around 2800 back when viewing the PLC online. I was wondering whether I need to scale it first or use a specific function block to be able to convert it to something I can use easier.

I hope I've explained that in a way that makes sense.

Thanks,
Sam

Yes you will have to scale it. Chapter 3 of the user manual for the module explains it, badly (IMHO) but it makes an attempt.

Hi again, I cannot find the document you're referring to, would you have a link I could possibly read through?

Thanks for helping. Really tricky one for me, this is...

aandjsam said:

Hi again, I cannot find the document you're referring to, would you have a link I could possibly read through?

Thanks for helping. Really tricky one for me, this is...

Click to expand...

http://literature.rockwellautomation.com/idc/groups/literature/documents/um/2080-um004_-en-e.pdf