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

Question asked by ajay mogle in #Coffee Room on Aug 14, 2012
ajay mogle
ajay mogle · Aug 14, 2012
Rank E2 - BEGINNER
so many controllers output is of 4 to 20 ma whearas some of them has 0 to 20 ma output why Posted in: #Coffee Room
arunfbd2012
arunfbd2012 · Aug 15, 2012
Rank E2 - BEGINNER
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 .
Harshad Italiya
Harshad Italiya · Aug 15, 2012
Rank A1 - PRO
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.
arunfbd2012
arunfbd2012 · Aug 16, 2012
Rank E2 - BEGINNER
visit https://www.control.com/thread/1026235722
You will get a better insight.

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