Thursday 30 September 2010

Different types of electrical signals

2
         i.            A analogue signal is a electrical signal thats varies in frequency or amplitude and can used to measure curtain things such as heat, pressure or weight, with a high degree of accuracy, this is because analogue signals can be adjusted more finely, compared to digital in such respects, in the above application the as the temperature varies the analogue signal will also vary, and using preset values for the amount heat or lack of it, the temperature can be accurately read.

       ii.            Digital signals on the other hand are either fully on or fully off, and can be used in programming because you can represent these as 1’s or 0’s, this is useful in lighting or communications, in respects to the LED display stated above the signal you could program each number to be shown by using a combination of the LEDs on the display, or instance for a 8, all the LED’s could be turned on or a 7 it would be A, B and C on the diagram below. The PLC would assign each one of the LED’s a output and when a curtain number is needed it could use these outputs and a digital signal to turn a combination of them on.


      iii.            Wireless signals can be used to communicate with the need for hard wires and actual physical connections, the most famous and commonly used is radio, but in respects to PLC’s wireless signals differ to radio signals, PLC’s can communicate with each other using devices such as the Omron WD30 which use connects a master PLC to slave PLC’S, below are the specifications of the WD30 showing the wave lengths and frequencies ect.
This wireless system would work by using a PC to program a master PLC, and using that PLC to communicate to other slave PLC’s which could be used to operate machinery, basically using a master plc to tell other ones what to do and control output from one source, without wires, as shown below in the diagram, this is also of the omron FAQ section.

15 comments:

  1. Very interesting! Following now.

    ReplyDelete
  2. So what would be the difference between say analogue and digital television transmissions, or analogue vs. digital cell phones?

    ReplyDelete
  3. i used to be very confused/ignorant about that stuff. cool.

    ReplyDelete
  4. Wireless scares the crap out of some people. I don't think their effects have been thoroughly tested.

    ReplyDelete
  5. Cool, really wonna learn more about this
    following

    ReplyDelete
  6. i might go listen some acdc now

    ReplyDelete
  7. I'm now not positive where you are getting your info, however good topic. I must spend a while learning much more or understanding more. Thank you for wonderful information I was in search of this info for my mission.

    Feel free to surf to my web blog; wire-wound resistor

    ReplyDelete
  8. Grеetings fгom Los angeles! I'm bored to tears at work so I decided to check out your website on my iphone during lunch break. I enjoy the information you present here and can't wait to
    take a loоk when I get home. I'm surprised at how quick your blog loaded on my mobile .. I'm not eѵen using WIFI, just
    3G .. Αnуhow, amаzing blog!

    My ωеbsite; En.Universitywiki.Org

    ReplyDelete
  9. Excellent artiсle. Κeep posting such kind of info on yоuг blog.

    Im rеally impressed by your blog.
    Нi thеre, You have pеrformed an excellent job.
    Ι will certaіnly digg it and for my part recommеnd to my fгiends.
    I'm sure they will be benefited from this web site.

    my webpage; potentiometer

    ReplyDelete
  10. Hi to every οne, since ӏ am genuinely kеen of гeаԁіng
    this webѕite's post to be updated regularly. It carries good information.

    Check out my blog; Ohm'S
    Law

    ReplyDelete
  11. omg , eventhough it's likely to be college things . but it helps me a lot!! thumbs up

    ReplyDelete
  12. may almighty God provide more and open your mind

    ReplyDelete