Questions about FX2n-4DA Special function block Performance specs

WhatThePLC

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Sep 2016
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California
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I’m a complete newbie with PLCs and electronics. I am trying to grasp why in the user’s guide section 5.2 Analog output range 0mA to + 20mA needs external resistance of 500 Ohms. Why is this value important? Thank you for your help.
 

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