How to Wire 4-20mA 2 Wire Current Loop or 4 Wire Current Source Analog

[@discodennis1337]

These video's are worth gold, thx alot.

[@TimWilborne]

Glad you like them!

[@discodennis1337]

@@TimWilborne I'm having a small PLC problem; I have a 4-20 temperature transmitter that i want to bring to my analog in but the plc doesnt read it ... I went from PS+ to TTR+ and from TTR- to PLC AI. And the PLC common is - .... So it's wired in the loop but it's not working, any suggestions?

[@TimWilborne]

Put a meter in the loop and see if it has a signal. Here is a video to help. kzbin.info/www/bejne/l3vbfaipo7-ZgLM

[@alejandromartinez3947]

¿Where did you get that loop simulator professional? I'd like to get one to do troubleshooting

[@TimWilborne]

Hi Omar, you can find the PLC Tools SIM-ALP2 at the link below. plctools.com/analog-simulator-and-generator-with-lcd-0-10vdc-and-4-20ma/

[@kennalindia5604]

Hey Tim Should I connect active / passive analogue output of an ABB flowmeter to my Micrologix 1400 IF4 module . The flowmeter is 230 powered.

[@TimWilborne]

Chances are it is an active or 4 wire device but you need to check the manual to be sure. In that case + goes to + and - goes to -.

[@dancrane4318]

I have a transmitter that is a 4-20mA 2 wire loop and I wired it as you've shown in the video with the 24vdc positive to transmitter positive, then transmitter negative to my multimeter positive, then multimeter negative to 24vdc negative and everything works as advertised, is what I can't figure out, or if it's even possible is that my analog input needs to be 1-5vdc, is there a way to wire this or place in a resistor somewhere to make it work or not? Thanks for all of your videos!

[@TimWilborne]

Hi Dan, see link below. Thanks for watching! www.theautomationstore.com/measuring-a-4-20ma-signal-with-a-voltmeter/

[@dancrane4318]

@@TimWilborne The problem when I do this with a 250 ohm resistor is that my transmitter loses power. I've been scratching my head on this for a while.

[@TimWilborne]

@@dancrane4318 Send me a sketch of your circuit. [e-mail]

[@nollyo3901]

Hi tim,can you do a video on how to use the multimeter to read and troubleshoot faulty transmitters in a plc control loop system.

[@TimWilborne]

It is coming soon Nonso, thanks for watching!

[@DerekPaz]

If I had a 2-wire sensor that had 4 wires coming out of it, how would I know how to wire it? Or are all sensors with 4 wires coming out 4-wire sensors?

[@TimWilborne]

Chances are you have a 4 wire sensor but do you have a part number?

[@DerekPaz]

@@TimWilborne no, it was just an idle question. I wondered if there was a quick rule of thumb or something, but it sounds like the answer would be to read the spec sheet and just become familiar with the part.

[@TimWilborne]

Yes, it is probably safest to check the spec sheet.

[@chickenz4604]

Hi Tim, Is it possible to use 24V DC Supply OUT from PLC to power HMI, electromagnetic flowmeter, and ph meter? or I should use different DC supply for these sensors?? Thankss!!!

[@TimWilborne]

While possible, I would advise against it. It gives your PLC less isolation. Some PLCs memory will become corrupt of you short their internal 24V power supply.

[@chickenz4604]

@@TimWilborne Thank You for your advice Tim! I will just use different DC supply for these sensors

[@darnellwalker880]

Hey Tim can you do some videos on how to tune PID loops? I have a Honeywell UDC 3500 controller I would like to get more familiar with.

[@TimWilborne]

Hi Darnell. We are planning on it after the current analog series. Thanks for asking!