Read a 4-20mA signal with a 0-10VDC PLC Input

In this video we go through how to wire a 4-20mA signal and how controllers read them using load resistors and voltage inputs.

Items used in this video:

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[madnanaz]

TQ Tim this video is a gold of knowledge in Automation.

[nakiapringley]

Great tip, I always thought you had to add an hmi in parallel. Now I know better. Thanks

[georgeabalon]

Very informative video. Thumbs up for that.

[PaulR]

Excellent, best video I’ve seen explaining this, thankyou

[aleksandrprokhorov]

Hello. There is a liquid level sensor. Power supply 24V. For setup of the sensor via the power supply the laptop is connected. HART protocol. Can you explain why parallel to an entrance of the laptop resistance of 250 Ohms is included? also in the line there is an analog PLC module. Sensor - Vegaflex 86, Power Supply - Vegastab 690.

[nakiapringley]

Can you do some videos on using the 4-20ma or 0-10vdc simulator on some economizers

[chickenz]

Nice Video Tim, Btw I want to ask question about wiring 3 analog 4-20mA sensors. I am using 2 wire transmitter (pt100) and two 4 wire transmitter (flowmeter and PH Meter) to my analog input extension. I did the wiring already where the 4 wire transmitter like usual and I use PLC 24V DC supply for the 2 wire transmitter. The problem is when the flowmeter has no flow at all it has value around (0-30) fluctuates (the digital range 0 - 32000). And i tried to remove the 2 wire transmitter sensor, it reduces to (0-14) fluctuates. Note: I think i have scaled it properly to liter/second for the flowmeter, I have also done shielding + twisting for the flowmeter analog cable, I connected all the ground of every device to the same point. I am not sure how to solve the problem, is it because i use 2 wire and 4 wire transmitter or maybe it could be from noise... Thank You Tim

[nikhunter]

When connect the resistor in series on circuit, is that restrict the overall current flow on the loop?

[EngrVhon]

Can you please make a video how to configure a 4-20mA in PLC, im using Schneider 334e.

[pietervdberg]

Hi Tim. Thanks for this and other informative videos. One question; is the 125 Ohm resistor value for a 2 to 10V reading correct. Should it not be 500 Ohm? V= I x R. V = 20mA x 500 Ohm = 10V and 4mA x 500 Ohm = 2V.

[Levon]

Can you make video how to troubleshoot PLC with out of getting into software

[vincenoviello]

Hi folks.  Just tried sending an email with the address on your website, and it says its an invalid email address.  Is there a new one?

[derrickgarcia]

Hello. Would like to learn more about PLC programming. Thanks

[MM-vikh]

Why analog card reads the signal as a voltage instead of current ?

[MM-vikh]

Thanks for this video,

But I have some inquiries, how much voltage required to operate transmitters? As i know it is 24 DC volt. So as you explain the voltage across the resistor is 5 v, , is this 5 volt used to operate a transmitter?

[chrysalide_aero]

Good day,
Why is it needed to convert 4-20 mA to 0 (or 2)-10V ? Is it a practical reason like 0-10V analog
inputs being more common or available on PLC ?
Or any other resons ?
Thanks & regards
Jean-François

[michaelcostello]

A wiring diagram would have been great as it would have given more clarity :(