PLC internal circuits

Discussion in 'Homework Help' started by NSCC_EETN, Nov 8, 2010.

  1. NSCC_EETN

    Thread Starter New Member

    Oct 6, 2010
    17
    0
    I have an interesting question on my assignment, and I need some help with it:

    "Inside a PLC's inputs and outputs, you may find opto-isolators, rectifiers, triacs, BJTs and relays. For each one, explain why it can or cannot be used for the following: Digital DC Inputs; Digital DC Outputs; Digital AC Inputs; Digital AC Outputs"

    Any ideas?
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Which of the list of components confuse you as to function? Have you listed the ones that you are sure of?
     
  3. NSCC_EETN

    Thread Starter New Member

    Oct 6, 2010
    17
    0
    relays i assume can be output and input DC, AC would not do much good

    BJT's would be for AC inputs and outputs

    the other two no clue at all. I'm not 100% sure if the above are correct.

    And yes these are the list of components i need to look over.
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    why would a contact button care about passing AC or DC?

    I think you need to read up a bit about transistors and triacs.
     
Loading...