Problem in wiring sinking plc output

Discussion in 'General Electronics Chat' started by cawan, Nov 2, 2011.

  1. cawan

    Thread Starter New Member

    Nov 2, 2011
    2
    0
    halu, i have problem when try to wiring the output sinking plc.
    the problem is when i give the supply to the plc, then all of the output will give the reading 24V even though all the port are NOT triggered.

    I try to triggered one of the output and nothing change. Still same and get 24v reading.

    some one can help me?

    thanks in advnc
     
  2. GetDeviceInfo

    Senior Member

    Jun 7, 2009
    1,571
    230
    If your output is sinking, then your port common connection(s) is wired to supply return to act as the drain.

    This is not the typical approach in industry, as damaged wiring may lead to actuation. Sourcing is the more common approach.
     
  3. cawan

    Thread Starter New Member

    Nov 2, 2011
    2
    0
    tqvm for your replying.

    is it normal when all of the output port give the reading 24vdc even though i not triggered the port?
     
  4. GetDeviceInfo

    Senior Member

    Jun 7, 2009
    1,571
    230
    this would be expected in a sinking type port, yes. When you output to the port, it will 'sink' the line down the common 'drain'. In other words, provide a low impedance path to the common terminal.
     
Loading...