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4-20mA Current Signal? Wiring, Scaling, Programming, Troubleshooting 

Tim Wilborne
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4-20mA signals can be used to make analog measurements such as tank levels, pH, pressure, speed, etc, yet 4-20mA current loop transmitters are one of the most misunderstood control signals when it comes to wiring and analog scaling. We are going to discuss how to wire 2 wire current loops, 4 wire current sources, how to determine your PLC's analog input raw scaling, how to convert it into engineering units, and how to troubleshoot a 4-20mA analog signal.
Get the full details at twcontrols.com/live
Items used in this video:
PLC Trainer twcontrols.com/plc-trainers
PLC Tools SIM-ALP2 plctools.com/plc-tools-sim-al...
The above links make these videos possible. Please use them!
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00:00:00 Introduction
00:10:08 Difference Between Analog and Discrete Inputs and Outputs
00:15:36 Studio 5000 Analog Configuration
00:21:13 2 Wire Current Loop vs 4 Wire Current Source
00:27:58 4 Wire 4-20mA Wiring
00:37:09 2 Wire 4-20mA Wiring
00:44:44 y=mx+b Explained
00:54:40 Scaling 4-20mA in Ladder
00:58:45 DINT vs REAL in Compute Results
01:06:12 Measuring 4-20mA signals
01:24:08 Programming 4-20mA Level to Run Pump
02:05:32 Programming 4-20mA to Heat and Cool
02:19:21 Scaling 4-20mA in Function Block
02:31:30 Scaling 4-20mA in Structured Text
02:38:48 4-20mA Function Block Heat and Cool Programming
02:52:40 4-20mA Structured Text Heat and Cool Programming

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22 июн 2024

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Комментарии : 91   
@TimWilborne
@TimWilborne 10 месяцев назад
Subscribe to Become a Better Technician ru-vid.com
@dhh488
@dhh488 2 года назад
Another great video. I like the unrehearsed, off-the-cuff feel, it's more true to life.
@TimWilborne
@TimWilborne 2 года назад
Glad you enjoyed it!
@ardentdfender4116
@ardentdfender4116 Год назад
I finally finished watching this video, 9+ hours after you had recommended the 3 videos earlier with a lot of stop and pause in between to do so,e other stuff. So, I’ve watched all 3 videos. Wasn’t expecting to watch a 3+ hr automation vid, but I watched it anyway in knowing I’ll learn something and did learn quite a few things. So the video was really great and helpful. In the last 20 min of the video you pointed to why logic is written or in what kind in relation to the people at the plant who looks at it or job is to rest it for troubleshooting. I think a bit the same question I answered earlier on another vid as to which logic is better but a more complex answer. I find what you explained here in the vid to be true but again it’s for reasons that most people watching these vid don’t often think of is the reason. And again for my company which is a large global OEM to the power, oil and gas in the equipment system they supply with somewhere around 2500 to 6000 tags, a field engineer has to go commission the new system. Most if not all the tech only really know and understand Ladder Logic. I understand some Function Blocks because I watch vids like these, but for practical purposes I’ll stick to saying I only really understand Ladder Logic so not to get over my head. But that’s why my company only writes applications strictly in clear Ladder Logic so the field guy who needs to make edit changes in the field as needed understands the logic in Ladder Logic. As well if a junior guy has to go to the customers site to make some requested Logic changes, he can read the logic in ladder logic vs function block programming or structured text. Your also a very good teacher, your patient minded in explaining and demonstrating things and that can be gleamed from 3+ hours of video watching. I’m not a trained automation tech as in went to class. Most of what I have learned I learned in the field at plant sites with my Senoir Automation Engineer assisting and helping with gut a an old plc system often PLC5 or SLC and replacing it with ControlLogix. In so doing you learn an immense amount that just can’t be taught. In many things I learned or have in those processed I come to vids like yours to understand something more that I experience in the field to give more context of understanding and it’s helpful because I’ve experienced it without full understanding the first time. I have Studio 5000 with full license on my laptop. I know and understand how to use it, yet everything I learned in how to use, I’ve learned mostly from watching other people use it including my Senoir Automation Engineer. In watching this vid, I actually learned a few things and some reinforcement of things learned as well watching. Because you so patiently explained and showed a lot of the logic explanation with the sensor it helped me more understand things in a methodological way. It was also the very first time I ever saw structured text programming. I may not remember it all, but I’ve seen it. Thus it is helpful to convey in feedback that while your just thinking your demonstrating something in say Studio 5000, someone out there watching is also learning by just watching you do things, show and move around the software application. That is always a very helpful passive way many learn how to do things in the software, just watching as you demonstrate and solve a logic problem. Much appreciation on the video, it was quite helpful and time well spent watching.
@TimWilborne
@TimWilborne Год назад
Glad you found this video helpful. It turned out to be a good one despite a power outage and starting an hour late :) Learning by doing is the best learning in my opinion.
@peterufrancess9344
@peterufrancess9344 Год назад
I love thid kind of just some work chatting , no need to be very official, very goof video, I love this!
@TimWilborne
@TimWilborne Год назад
I try to keep it as genuine as possible. Thanks!
@longbowcolorsorter6503
@longbowcolorsorter6503 2 года назад
Great job. Love the lesson. Keep up the work.
@TimWilborne
@TimWilborne 2 года назад
Thanks, will do!
@JoeWaZoo1_Geeks_Rule
@JoeWaZoo1_Geeks_Rule Год назад
That 4-20mA Simulator is the Best!
@TimWilborne
@TimWilborne Год назад
Glad you like it Joe!
@user-oq8oz7cl9h
@user-oq8oz7cl9h 9 месяцев назад
thanks sir for sharing valuable information, kindly make video on single ended, differential modes of wiring of analog input module.
@TimWilborne
@TimWilborne 9 месяцев назад
Ultimately they are the same, one just has a common and the other is isolated. 2 Wire vs 4 Wire is what usually stumps people on them. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-lmGbT7PNEZ4.html
@adielsoncarlos7550
@adielsoncarlos7550 2 года назад
muito bom os seus videos ...
@TimWilborne
@TimWilborne 2 года назад
Obrigado
@mhollin100
@mhollin100 2 года назад
Gretat stuff Tim! Love it!
@TimWilborne
@TimWilborne 2 года назад
Glad you enjoyed it!
@unusale3633
@unusale3633 Год назад
I'm new to the channel from Staten Island
@TimWilborne
@TimWilborne Год назад
Welcome!
@qingshuiyu4058
@qingshuiyu4058 7 месяцев назад
thank you Tim!
@TimWilborne
@TimWilborne 7 месяцев назад
You are welcome.
@tnman6938
@tnman6938 2 года назад
in the industry, it's called field power and buss powered. worked in few nut plants , you put a 250 ohm resistor in parallel with 4-20 and you get 1-5 volts. proportional, 1=4, 3=3,5=20!!
@TimWilborne
@TimWilborne 2 года назад
Yep, here is a video where I talk about that ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-tZtBSUYUcfk.html Here are a few other popular resistor values ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-DAMW5sKoH6E.html
@ardentdfender4116
@ardentdfender4116 Год назад
In my Industry for equipment and systems which are Water Plant OEM and PCE custom designed plants we do tend to have quite a bit of HART enabled devices. That’s across most big projects. It’s not every field device, but it may be at around a dozen devices. Often it’s at the request of the customer or the company overall doing the entire plant site build and us doing the subcontract work to supply one part of a huge site with the Water Plant and tanks. So it can be a good think to just try and cover HART field devices.
@TimWilborne
@TimWilborne Год назад
Yes, it is on my list to do some HART videos, I just have to wait until I have a project for the hardware.
@ardentdfender4116
@ardentdfender4116 Год назад
@@TimWilborne All good and thanks. Will keep an eye out for such videos. I usually browse around anyway just looking at other stuff of interest.
@pinoycalibrationmaster
@pinoycalibrationmaster Год назад
Hi Sir thanks for your video tutorial
@TimWilborne
@TimWilborne Год назад
You are welcome
@LearningInVR
@LearningInVR 2 года назад
Thanks Tim so glad this stuff is here and available 24/7 , i use plctools at work, and the great instruction you provide has made me look like i know what im doing. : )
@TimWilborne
@TimWilborne 2 года назад
Great to hear!
@kevanbendt
@kevanbendt 2 года назад
if still available super interested! I am little confused still on differential vs single ended analog. We move jumpers on certain modules in order to incorporate it, but its always a during a down trouble shoot. Its the first thing we seem to do before we go out to the device itself. Older devices of course... also in regards to modbus/different means of communication, do you have prosoft communication videos anywhere?
@TimWilborne
@TimWilborne 2 года назад
I haven't covered the difference between isolated and single ended analog inputs. I'll put that on the list. With single ended analog inputs, all of the mA- points are connected together to the common terminal. With isolated, each one is exposed. The jumpers you see are typically on the isolated ones, jumping all the mA- points together.
@Bianchi77
@Bianchi77 Год назад
Nice video, thanks :)
@TimWilborne
@TimWilborne Год назад
Glad you liked it!
@JD-rk2gq
@JD-rk2gq 2 года назад
Thanks for great info. Keep it up. Can I get an IND560 Meter Toledo to go to through a Meter Toledo Analog Output Module to provide 4-20ma output to a Provox DCS?
@TimWilborne
@TimWilborne 2 года назад
Not familiar with those devices.
@darthenx2585
@darthenx2585 Год назад
I made my scale AOI and just set it up that way for all my programs
@TimWilborne
@TimWilborne Год назад
Yes, you have to love an AOI for packaging up good code for reuse.
@joelenser3850
@joelenser3850 Год назад
im looking for videos on modbus setup for plcs and sensors, great videos.
@TimWilborne
@TimWilborne Год назад
Hi Joe, here is a playlist with some Modbus videos. ru-vid.com/group/PLUi5cdVq3wTCNyXp_W496Z-td2RPm3nES
@tib4177
@tib4177 Месяц назад
nice video
@TimWilborne
@TimWilborne Месяц назад
Thank you
@nisanvlog7269
@nisanvlog7269 Год назад
Very good
@TimWilborne
@TimWilborne Год назад
Thanks
@clems6989
@clems6989 2 года назад
LOOP POWERED !
@Hewagej
@Hewagej Год назад
Wow Grede work dear
@TimWilborne
@TimWilborne Год назад
Thank you!
@Alex-pz7kr
@Alex-pz7kr Год назад
Hi Tim. How to determine the channel error? in siemens we have -32768 - wire break, +32767 - overflow, or we can use channel status variable?
@TimWilborne
@TimWilborne Год назад
There are tags that you can look at in Studio 5000, look in Local:X;I. I should do a video on that sometime. It is a great troubleshooting feature.
@Alex-pz7kr
@Alex-pz7kr Год назад
@@TimWilborne Thanks for reply, we can use that formula for all modules? And what about analog outputs, is there another formula, like unscale?
@johnhall1614
@johnhall1614 Месяц назад
I work for Duke energy, all they use is Hart. They do not like laptops being in our building
@TimWilborne
@TimWilborne Месяц назад
I should do a series on HART sometime.
@mw3blackopsglitches
@mw3blackopsglitches Год назад
Can you put the Function blocks min and max Error codes into ladder logic or have it as a tag?
@TimWilborne
@TimWilborne Год назад
Yes, you should be able to find them in the tag browser then you can use MOV instructions to move settings in and out of them.
@tnman6938
@tnman6938 2 года назад
I think the numbers your looking for is; 3,277=4ma-16,384=20, for programming
@TimWilborne
@TimWilborne 2 года назад
It depends on the resolution of the analog sensor and the full range. That is only one of numerous possibilities.
@tnman6938
@tnman6938 2 года назад
@@TimWilborne 10-4
@tnman6938
@tnman6938 2 года назад
ya, your correct, it, been about 14 years since I was programming. been in I&C Commissioning ever since then ,which is nothing but troubleshooting and calibrations. that's what I was wanting to talk to you about on another post, which I don't see on here anymore. it's where I was requesting your email. thanks for your reply. @@TimWilborne
@justinpuzak2558
@justinpuzak2558 2 года назад
how come my properties look different in studio 5000, is it cause im using a different module? mine is a 1756-if16.... my engineering units are defaulted from 0% to 100%
@TimWilborne
@TimWilborne 2 года назад
Each module has different defaults and even different resolutions.
@justinpuzak2558
@justinpuzak2558 2 года назад
Thanks Tim. I just changed the default units to 3227-16383 so I can follow along with the algebraic scaling equation to your example.
@mia9116
@mia9116 3 месяца назад
Hi Tim, really great informative video! I really learned a lot!!! I am just confused on where the values 3277 and 16383 raw come from? Is it standard or are they arbitrary?
@TimWilborne
@TimWilborne 3 месяца назад
That's a really tricky question because it depends on the particular controller. I'm this one's case it has to do with the bits of resolution. Here's a video about it. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-oXMF1rDRtEM.html
@mia9116
@mia9116 3 месяца назад
Thank you so much. I'll check it out!!! I was out on Friday trying to troubleshoot a level transmitter. The plc technician and I went to the panel and measured the current (which he explained how when measuring current, it has to be connected in loop and im glad you mentioned that in this video, really reinforced the concept!). The current was reading 21.7 mA and I wanted to know if you have videos where you talk about what to do if analog transmitter's current range reads below 4 or above 20 and how to go about it?
@TimWilborne
@TimWilborne 2 месяца назад
I don't think I have ever address that. Usually it means the transmitter is bad or the probe connected to it. That would make for a good video.
@mia9116
@mia9116 2 месяца назад
@TimWilborne interesting 🤔 I think a video like that would be very beneficial! Going to continue watching more of your videos! Keep up the great content!!! 👏
@TimWilborne
@TimWilborne 2 месяца назад
Let me see if I can set some hardware up on the next batch I record.
@ismaelvasquez284
@ismaelvasquez284 Год назад
Hi Tim
@rajamahendra4170
@rajamahendra4170 2 года назад
sir what is the programme for micro 850 ,,2080-if4 module for level transamitter loh and rof values
@awhite3031
@awhite3031 Месяц назад
If everything was auto configured what would they need guys like us for. I am not even close to your caliber that you but getting there. I would like a devicenet and controlnet (dirty words) tutorial.
@TimWilborne
@TimWilborne Месяц назад
I have both of those set up at the training center. It wouldn't be a bad idea to do a review. I'll put it on the list.
@rajamahendra4170
@rajamahendra4170 2 года назад
sir what is the analog range to 2080-if4 analog module
@kcnb28
@kcnb28 2 года назад
I just recently discovered plc's and what plc operators get paid so now I'm studying everything plc. I have several issues though, the first being is it worth me even going down this path because I am an IT person but cannot get a decent job in IT because I have a criminal background, mostly just marijuana charges. Will I even be able to get a job doing this?
@TimWilborne
@TimWilborne 2 года назад
That is a tough place to be. This is actually on my list of things to talk about. You will struggle to get a job at some of the larger companies but there are huge opportunities at small to medium companies. You can't erase your past, but you can make your skills outshine them. Can I share your question?
@kcnb28
@kcnb28 2 года назад
@@TimWilborne sure
@justinpuzak2558
@justinpuzak2558 2 года назад
i am using version 32
@zanekeeler4730
@zanekeeler4730 Год назад
asics?
@masumahmed7978
@masumahmed7978 Год назад
very high level english
@billjosey7681
@billjosey7681 2 года назад
Bill from Louisiana
@TimWilborne
@TimWilborne 2 года назад
Hi Bill
@abiodunilori8647
@abiodunilori8647 11 месяцев назад
hi to you
@TimWilborne
@TimWilborne 11 месяцев назад
Hi!
@emmanuelawuku5202
@emmanuelawuku5202 Год назад
WHY DO WE USE 4 TO 20mA NOT 0 TO 20mA BRO
@TimWilborne
@TimWilborne Год назад
Live zero, I discuss it in this live stream :)
@tnman6938
@tnman6938 2 года назад
Nuc Plants not Nut Plants. Sorry
@dhh488
@dhh488 Год назад
I work in a nut house.
@juniorngaba2069
@juniorngaba2069 Год назад
hallo sir
@emmanuelawuku5202
@emmanuelawuku5202 Год назад
HI MAN HOEW ARE YOU DOING
@demetrioorozco6630
@demetrioorozco6630 2 года назад
Great job. Love the lesson. Keep up the work.
@TimWilborne
@TimWilborne 2 года назад
Thank you Demetrio.
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