×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Interpreting Modbus to Voltage

Interpreting Modbus to Voltage

Interpreting Modbus to Voltage

(OP)
I have what I think should be an easy problem to fix, but I am an ME whose controls experience unfortunately is confined to a former employer's proprietary language, and have only minimal experience with typical commercial PLC's

As part of a system we're developing, there is a purchased control system. This controller has a handful of discrete I/O for start/stop/fault, etc. and a whole bunch of operating information available over Modbus. This system will be tested in our test cell. The test cell data aq system is not very modern, and for the data we'd like to gather, it would be easiest brought into the test cell system as analog voltage.

So my first thought is that I could get a cheap PLC from Automation Direct, with Modbus protocal, and some analog voltage out modules, and be able to interpret the modbus info we're interested in into 0-10 V signals our test cell can read.

Is my approach do-able, or am I off base? Or is there a simpler solution to this?

Thanks in advance for the help.

RE: Interpreting Modbus to Voltage

That would work as long as you have no time response constraints. If you have time response constraints it may still work but you'd have to do some figuring. The AD CPUs have broadened lately. The Ethernet CLICKs are very nice to work with and I think they even have CPUs with analog out now. They definitely take in Modbus, both Ethernet and 485.

Keith Cress
kcress - http://www.flaminsystems.com

RE: Interpreting Modbus to Voltage

(OP)
Thanks. Not too concerned with time response...we're not looking for quick transients, just want to be able to get steady state values into our system. The CLICK looks like an economical solution.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

eBook - 10 Reasons to Choose CATIA on the Cloud
To compete in today’s fast-paced and competitive market, smaller and newer firms need a powerful platform that will enable them to compete with bigger players, without the heavy investments needed in computer hardware, software and personnel. Download Now
White Paper - Smart Manufacturing for Electronics
This white paper describes a transformative approach to electronics manufacturing made possible by the addition of Mentor Graphics to the Siemens family. It describes a completely digitalized strategy that supports both printed circuit board (PCB) and mechanical design and manufacturing, uniting the entire product lifecycle – from idea and production to customers and back. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close