what is need of 4 to 20miliampear & 0 to 20miliampear

ajay mogle

ajay mogle

@ajay-mogle-tR2YZr • Oct 22, 2024
so many controllers output is of 4 to 20 ma whearas some of them has 0 to 20 ma output why
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  • arunfbd2012

    arunfbd2012

    @arunfbd2012-Actiy0 • Aug 15, 2012

    the digital signals work on standard 0-5v , so having a 4-20ma and a 250 ohm resistance we can output a 0-5v range from the controllers.
    But if 0-20ma is used, where 0ma for minimum value and if there is a failure in the transmitter wire,say it is grounded then the value read is 0ma again, so to identify this failure Industries now mostly stick to 4-20ma .
    0
  • Harshad Italiya

    Harshad Italiya

    @harshad-ukH5ww • Aug 15, 2012

    ajay mogle
    so many controllers output is of 4 to 20 ma whearas some of them has 0 to 20 ma output why
    Can you please let me know where you read this ? I mean in datasheet or anywhere else? As I know this 0 might be referred to Input only pin of Controller.
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  • arunfbd2012

    arunfbd2012

    @arunfbd2012-Actiy0 • Aug 15, 2012

    visit#-Link-Snipped-#
    You will get a better insight.
    0