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Allen Bradley PLC SCP help

Discussion in 'Electrical Engineering' started by BIGEYE, Aug 4, 2005.

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  1. BIGEYE

    BIGEYE Guest

    We have an Allen Bradley PLC programmed by others. I have two analogue
    inputs connected and their inputs are programmed to a SCP Scale with
    parameters block.
    The two 4 to 20 mA inputs are from gas monitors ant the range of the
    monitors is 0 to 90 parts per billion. Both inputs are the same and perform
    the same functions.
    However, both SCP blocks are scaled differently and ask if one of them is
    incorrect.
    4 to 20 mA input = 0 to 90 PPB.
    Block 1 is programmed as
    Input min = 3277
    Input max = 16384
    Scaled min = 0
    Scaled max =90

    Block 2 is programmed as
    Input min = 3277
    Input max = 16384
    Scaled min = 0
    Scaled max =900

    Appreciate any advice.
    TIA
     
  2. SQLit

    SQLit Guest

    I will bet that Block 2 is a typo.. Does block 1 work correctly?
     
  3. BIGEYE

    BIGEYE Guest

    Yes it works correctly, I think you are right that it is a mistake.
     
  4. SQLit

    SQLit Guest

    It is easy to make mistakes when programing PLC's. I check and recheck every
    key stroke 3 times before walking away from a program.
     
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