PLC Question

Discussion in 'Programmer's Corner' started by Dave1971, May 17, 2007.

  1. Dave1971

    Thread Starter New Member

    May 17, 2007
    4
    0
    Thanks for your help
     
  2. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    These questions appear to be part of a homework assignment or perhaps test questions.

    I recommend you give them a shot and then post your answers for the membership to take a look at and comment upon.

    hgmjr
     
  3. Dave1971

    Thread Starter New Member

    May 17, 2007
    4
    0
    Hi,

    They are part of a assignment, i haven`t a clue on how to answer these question, all i know is analogue signals have problems with noise.
     
  4. Papabravo

    Expert

    Feb 24, 2006
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    1,786
  5. Jimbo3123

    New Member

    May 15, 2007
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    0
    Ugh, normally I hate it when people come to the forums for homework answers.

    I will try to give you a little direction though.
    i. What does a current loop have in common at every point (Think KCL)?. How would this be an advantage over a voltage signal with long (possibly unknown) wire runs/voltage drops?

    ii. Look at the price difference between an analog input and digital input card for any PLC mfg.
     
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