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Analog Channel Nano-10 loading
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Topic: Analog Channel Nano-10 loading (Read 11335 times)
asitsaha
Newbie
Posts: 4
I'm a llama!
Analog Channel Nano-10 loading
«
on:
May 03, 2014, 05:55:50 AM »
Wiring done as per Nano-10 user manual. We need to convert 4-20 ma to voltage. I have used 253.16 ohm resistance. The 4-20 ma channel (ABB PLC analog output) supplying the current is getting loaded. Pl suggest the solution
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support
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Posts: 3174
Re:Analog Channel Nano-10 loading
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Reply #1 on:
May 03, 2014, 10:59:07 PM »
What do you mean by getting loaded? The resistors you use is connected in parallel to the 20K ohm internal impedance of the AI which presents a 250 ohm load to the 4-20mA current source which will convert it into 1 to 5V that the Nano-10 can read.
Are you using a 2-wire loop-powered type of analog output from your other device? If so you will need to wire it similar to what's shown on this forum thread:
http://www.triplc.com/yabbse/index.php?board=2;action=display;threadid=347
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Analog Channel Nano-10 loading