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Profibus VP power supply (+5V)

Discussion in 'Electronic Design' started by markp, Jul 21, 2010.

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  1. markp

    markp Guest

    Hi All,

    I'm designing a Profibus interface. I'm a little confused with the +5V
    termination power supply (Voltage Plus, or VP). My understanding is that VP
    is supplied by something on a segment that is used to actively terminate all
    the receivers, and usually these resistors are in the Profibus connectors
    themselves.

    So:
    Is it the master only that drives VP onto the bus?

    If my device can be a master or slave, I presume I have to be able to either
    drive VP or not depending on whether I'm a master or not (?)

    What is the current requirement of VP?

    Also, for bog standard RS485 applications I usually use isolated 5V supplies
    locally on each receiver, and a common signal ground reference linking them.
    Is that usual with Profibus too?

    I guess the master would generate VP referenced to this same common ground
    signal, I assume using an isolated supply. Which means if I already have an
    isolated supply as part of the reciever section I could use that directly to
    drive VP (?)

    Sorry for all the questions, I can't seem to find any docs that tie this
    down.

    Mark
     
  2. JosephKK

    JosephKK Guest

    Try this, i think it looks promising:

    http://www.profibus.com/nc/download...y-and-application-system-description/display/
     
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