×
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

analog signal converter

analog signal converter

analog signal converter

(OP)
http://www05.abb.com/global/scot/scot209.nsf/veritydisplay/4226c8e0d7404019c125750e0044f83e/$File/2CDC110004C0206_05-01.pdf
here is shown at the 3.page a nice pic , what i understand is this converter takes analog signal and converts it to another signal, but i searched through internet to learn what it makes exactly and some sites cite that analog signal converters are analog-digital converters and at this pic perhaps it means that analog signal is converted to digital signal since the signal is fed to a plc,as far as  i know plcs have analog input but i am confused. so can u tell me what do these converters exactly?

RE: analog signal converter

Not sure if I am understanding you correctly, but here goes.

Sometimes a PLC, even if it has an analog input, can only accept a specific type of analog input. For example, the PLC can accept 0-10VDC, but you have a field device that can only put out a 4-20ma signal. The Signal Converter is used to accept the 4-20ma signal from the field and convert it to a proportionally scaled 0-10VDC analog signal that the PLC can accept. They are also used to convert to digital signals as well, it all depends on what you need and what you buy.

Another common use is to add isolation from the field device signal and the controller input so that if there is a problem at either side, it dos not harm the other side. For example let's say you have 4-20ma from a field device and a 4-20ma input in the PLC so conversion is unnecessary. But if someone accidentally connects 110VAC to the remote wires it will possibly damage the converter module but not burn out the PLC input and cause the entire process to shut down.


"If I had eight hours to chop down a tree, I'd spend six sharpening my axe." -- Abraham Lincoln  
For the best use of Eng-Tips, please click here -> FAQ731-376: Eng-Tips.com Forum Policies  

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!


Resources