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Q&A How do PLCs normally measure 4-20mA current loops?

You can predictably generate a voltage with a R-2R ladder or a Rn^2 selector and then use a commodity V-I industrial converter interface to generate the current loop the customer desires. You cann...

posted 2y ago by KalleMP‭  ·  edited 2y ago by KalleMP‭

Answer
#2: Post edited by user avatar KalleMP‭ · 2022-09-23T22:11:37Z (about 2 years ago)
fix typo
  • You can predictably generate a voltage with a R-2R ladder or a Rn^2 selector and then use a commodity V-I industrial converter interface to generate the current loop the customer desires.
  • You cannot make assumptions of the shut resistance that the receiver will present, it may not even be purely resistive.
  • You may be facing outside pressure that the client is feeling where a competing supplier has motivated for a change in specifications in the hope that they can fulfil the specifications quicker than you can. Good luck.
  • You can predictably generate a voltage with a R-2R ladder or a Rn^2 selector and then use a commodity V-I industrial converter interface to generate the current loop the customer desires.
  • You cannot make assumptions of the shunt resistance that the receiver will present, it may not even be purely resistive.
  • You may be facing outside pressure that the client is feeling where a competing supplier has motivated for a change in specifications in the hope that they can fulfil the specifications quicker than you can. Good luck.
#1: Initial revision by user avatar KalleMP‭ · 2022-05-16T17:41:44Z (over 2 years ago)
You can predictably generate a voltage with a R-2R ladder or a Rn^2 selector and then use a commodity V-I industrial converter interface to generate the current loop the customer desires. 

You cannot make assumptions of the shut resistance that the receiver will present, it may not even be purely resistive.

You may be facing outside pressure that the client is feeling where a competing supplier has motivated for a change in specifications in the hope that they can fulfil the specifications quicker than you can. Good luck.