Allen Bradley Dial-Up Comms?

[bluenoser337]

I'm wondering if I can get a MicroLogix or Micro800 to communicate with another same CPU over a dedicated phone line, using dial-up modems? I've done this with RTUs meant for this purpose, but this is such a simple application that I'd like to reduce the cost and keep it as simple as possible. I'm only trying to read a single analog value from 5 miles away and display it on an HMI connected to the local PLC via RS-232. Any suggestions appreciated!!

 

[krakenfan69]

I'd use Trio JR900 radios or a cheaper Digi Radio to communicate between the two sites. I prefer the Trio as i's set up is so simple it saves me time.

Kraken Fan #69

 

[bluenoser337]

I've been on that roller coaster, Kraken. In this case I need to use a phone line.

 

[krakenfan69]

Maybe this can help.

http://literature.rockwellautomation.com/idc/groups/literature/documents/um/1764-um001_-en-p.pdf (pge 4-5)

http://www.sixnet.com/dist/tn623.pdf

Kraken Fan #69