Test Bench for PLC IO - 0 to 10V Analogue Input

Discussion in 'Embedded Systems and Microcontrollers' started by TheArgyll, Jun 21, 2016.

  1. TheArgyll

    Thread Starter New Member

    Jun 21, 2016
    2
    0
    Hello All,
    I am developing a test rig for a Programmable Logic Control I have bought to teach my son programming on.

    I have the circuit diagrams for handling Digital Inputs/Outputs as I would like, however I have 2 Analogue Input channels that can only read 0-10v signals. Does anyone know of a simple device I could mount behind the front plate of a panel with a dial of some description protruding through to allow the user to determine the input voltage?

    I am pretty new to the whole electrical/electronic side of things, so any advice or guidance anyone can offer would be most welcome.

    Regards,
    TheArgyll.
     
  2. Papabravo

    Expert

    Feb 24, 2006
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  3. TheArgyll

    Thread Starter New Member

    Jun 21, 2016
    2
    0
    Thanks for replying Papabravo... Is a voltage follower something I would have to construct or can I buy one and chuck it in there with a potentiometer? I have Googled this and the hits seem to be circuit diagrams, which are currently horrifying to a newbie such as I! :)

    Thanks again!
    Arg.
     
  4. Papabravo

    Expert

    Feb 24, 2006
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    A Voltage follower is constructed from an operational amplifier wired in a particular configuration, as you can see from the links that I provided. For your application you should pick one that is cheap and operates with a single power supply.
     
  5. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Why not simply just a 10vdc supply and a 10k pot and a dial?
    Max.
     
  6. tsan

    Member

    Sep 6, 2014
    41
    4
    What is the input impedance/resistance of the analog input? It is typically that much high (more than 10 kohm) that a potentiometer can be used without voltage follower.
     
  7. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Depends on what PLC and analogue module.
    Max.
     
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