What is HART Protocol?

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In this video, you will learn what HART protocol is, how HART is used with analog sensors, how a HART analog sensor works, and what advantages a HART analog sensor can give your operation.
Current-loop technology has been used for analog sensors for the past 4 decades to transmit important process data to the control system, whether that system is a DCS (distributed control system) a PLC (programmable logic controller), or a single-loop controller.
Current-loop data transmission is simple and cost-effective. Only a small amount of current (4 to 20 milliamps to be exact) is required over a single pair of wires for each current loop sensor. One 2-amp, 24 Volt DC power supply can “drive” dozens of sensors.
For current-loop analog sensors, the lowest measurable process value is called the Lower Range Limit, or LRL. The analog sensor will output 4 milliamps at this 0% reading. The highest measurable process value is called the Upper Range Limit, or URL. The analog sensor will output 20 milliamps at this 100% reading.
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A special thanks to Frederico Duarte Fagundes for translating this video.
#RealPars #HART #HARTProtocol

[@realpars]

Want to learn about industrial automation? Go here: www.realpars.com/individual-pricing Want to train your team in industrial automation? Go here: www.realpars.com/pricing-team

[@AM-sk5ht]

Thanks Real Pars, as always, you guys describe complicated technical issues in a very simple and understandable language. I'm a huge fan of your videos.

[@realpars]

Hey! Thanks a lot for your kind compliment! We are always extremely happy to hear such positive feedback! If you ever have any questions, feel free to reach out to us. Happy learning!

[@ardentdfender4116]

I feel both great joy and sadness watching these videos and it’s conflicting. Great joy in that I learn sooo much than in my own job in Operations, Process & Automation Controls. Great sadness and it saddens me to admit it here also in that I don’t learn this much in my own job in Automations dealing with all these components, devices, protocols and plc’s and that saddens me greatly. I started my career as a Operational & Mechanical Technician in Operations at Utility and Power Plants. I now more work in Field Service, Equipment Commissioning, Plant Startups and Automations. The engineers when they even try to explain stuff are never close to this clear in explaining anything at a simple level either. As my own company also don’t believe in training or sending anyone to training. Sadness to me. But great joy watching and learning to fill in the gaps in my knowledge watching these videos. Every video I see I can relate to something done in my job or where I wasn’t clear in how something worked. The easy explanations here fills in my knowledge greatly and with great joy. I can’t say just how much I enjoy watching the videos here and know it’s directly affecting my job and what I know as well when I look at the devices, components, plcs etc.

[@realpars]

Thanks for this beautiful compliment, Ardent!

[@aryanrathi4876]

That makes two of us @ardentdfender4116

[@siyaramswitchgears5830]

great video. I am a flow meter manufacturer and in the process of acquiring HART for my devices

[@LetsGoAdventurePH]

Your videos are very informative it helps me recall and review my automation skills.

[@realpars]

Happy to hear that!

[@SanjayKumar-cg7eo]

I would like to thank you for your videos. Best to date. Clear, simple, and really easy to understand. Thank you.

[@realpars]

So nice of you, thanks a lot!

[@damianobando5261]

I liked your video, you have made it in a concise and clear way that it is a HART protocol, its history and even how analog sensors work, the best part was when you explained the ASFK and gave an example of the telephone line.

[@realpars]

Thanks for your support, Damian! Happy learning.

[@fabanoz]

HART is not hard to understand with a very concise explanation by REALPARS ! Thank you very much for your efforts

[@realpars]

Hi Fatih, Thanks a lot for your kind compliment! We are always extremely happy to hear such positive feedback! If you ever have any questions, feel free to reach out to us. Happy learning!

[@nazarioa.m.nolasco2364]

Excellent lecture. The voice and presentation are very clear.

[@realpars]

Thanks a lot, Nazario! Happy to hear that you are enjoying it completely!

[@mareysaad6597]

Wow, this is absolutely charming, demonstrating a complicated topic in an easy method 🎉🎉🎉

[@realpars]

Glad it was helpful, Marey!

[@kinsinglim]

Thanks to REALPARS. This video is a high level and precisely explains the HART protocol. I will help to share in my Linkedin network and hope engineers will have a good understanding of the HART protocol and able to choose the correct instrument if they looking to collect the diagnostic data preparing for predictive maintenance.

[@realpars]

Thanks for your support! Great to hear such positive feedback. Feel free to reach out if you have any questions. Happy learning!

[@kinsinglim]

RealPars. Appreciated for your offer. I am actually just completed introduce a good size of a instrument diagnostic system into my company and gained massive success. Am currently preparing another one for another project, I hope repeat my success but further embedded into the New Way of Working for my colleagues. I potentially having some question about the DD compatibility questions if you have in depth knowledge about that.

[@jaykesapalaran5434]

Real Pars you guy's are amazing,all of your videos are very informative and easy to understand.

[@realpars]

Glad you like them!

[@TheOrly89]

This is like discovery chanel explaining how automation works!!! Good job and thank you!!!

[@realpars]

Thanks for your kind comment! We appreciate that!

[@baconsledge]

I learn something worthwhile with every one of your videos. Excellent!

[@realpars]

That's amazing, Bob! Happy to hear that.

[@EducationonSVUVM-gw2ez]

Very Educational, clear explanations of basic fundamentals. Highly appreciated.

[@realpars]

Glad you think so!

[@KennyKim0406]

My god you are amazing at teaching. I was wondering why you were talking about bell 202 modem standard, until you linked that same concept to HART and then boom, I understood! Thank you for the video!

[@realpars]

Glad we could help!

[@devanshatray6545]

Thanks for really educating automation videos which aren't available anywhere. Keep up the great work!

[@realpars]

Thank you Devansh! We're glad you're enjoying the videos!

[@Automation_workshop]

I love the way you make videos, its very easy to understand thumbs up keep uploading interactive videos

[@realpars]

Very great feedback Asghar! Thanks for watching!

[@ericramey6503]

No u don’t

[@Iamadisco_dancer]

Best channel to understand automation !

[@realpars]

Hi Rohit! Thanks a lot for your kind compliment! We are always extremely happy to hear such positive feedback! If you ever have any questions, feel free to reach out to us. Happy learning!

[@andrewschneider5381]

Cool video! You have 5 modules: 1) A power supply 2) CPU315-2 DP Power Supply 1P 6ES7 315-2AG10-0AB0 3) 6ES7331-7TF01-0AB0 | HART Analog Input Module 4) What is this module and it's function? 5) What is this module and it's function? On module 2) Does RS 232 connect to the PC with a USB and a HART modem?

[@realpars]

The fourth and fifth modules are analog input modules just like module 3. They were added just to show that a CPU315-2 rack can have multiple I/O modules. The programming terminal is connected to the CPU using either a Profibus-DP connection or an MPI connection. These are both serial links that require a special modem or PCI card at the computer end. A HART modem is used to communicate with a HART device in order to configure the sensor. This connection is external to the PLC hardware setup.

[@albakhati5529]

This is the best subject for discussion , thanks 🙏 RealPars

[@realpars]

You're very welcome!

[@sebastiantabares5964]

Excellent video, really interesting known the protocol and also the history, the parallel view of the "bell 202" with the HART Protocol make clear the explanation!

[@kankkator]

This may be the best video for HART Communicaton. Many thanks.

[@realpars]

Great to hear that, Fuat! Thanks for sharing.

[@danielbarba4502]

Great explanation on HART protocols technology that really made a big change in industries when taking measurements.

[@realpars]

Thanks for your support, Daniel!

[@alessandrasanchez482]

Importants facts like the increase Plant Availability, Reduce Maintenance Costs and Improve regulatory compliance. Excellent work!!!!I will like more videos with good information about the protocols in the industry. Greetings from Ecuador!!

[@realpars]

Thanks for your support, Alessandra!

[@elave16]

Great videos. Definitely going to checkout you courses since I program mostly s1200's with tia 14

[@realpars]

Thanks a lot! Happy learning :).

[@satyapolnati3658]

Nice

[@SaifulIslam-xl4ov]

Lol ok thanks

[@emilyangulo193]

very good explanation helped me a lot to understand the subject, very detailed

[@realpars]

Glad to hear that!

[@mariomorales1707]

Excellent videos. Thank you very much. Greetings from Mexico City.

[@realpars]

Hi there, Happy to hear that! Greetings back! ;)

[@tonnguyen1531]

thanks for your effort for making this awesome video. I love your voice, your animation, ... Everything. Thank you very much.

[@realpars]

Hi Ton! Thanks a lot for your kind compliment! We are always extremely happy to hear such positive feedback! If you ever have any questions, feel free to reach out to us. Happy learning!

[@matthiasbindzus2453]

Great videos. Brief explanation having all basics. Good understanding for non-native Englisch speaker

[@realpars]

Great to hear that, Matthias! Thanks for sharing and happy learning.

[@bryancabrera8567]

It's a clear and great explanation about HART protocol.

[@realpars]

Glad it was helpful!

[@maikelholguin9891]

What a great explanation. Simple and to the point! excellent for people who are starting with these topics

[@realpars]

Glad it was helpful, Maikel! Thank you.

[@saleemdanish5417]

all videos are very useful...specially for beginners...thanks you so much..

[@realpars]

You're very welcome! Let us know of any questions.

[@olgergarciafalcones1386]

good video, explains very directly about components, ways to connect and how the industry has facilitated

[@realpars]

Thank you, Olger!

[@hetanhawke1695]

U R THE BEST IN KZbin .

[@realpars]

Thank you, Hetan! :)

[@ledavi3818]

Heh

[@thassioam]

Totally agree

[@therushi1]

how many sparkies out there wanna be a Instro by watching this video ?

[@souravray9439]

Very good presentation. Clear and precise. 👌. Keep making such videos on Instrumentation topics. It really helps us engineers. Thanks.

[@realpars]

Thanks for your kind support, Sourav! We truly appreciate that.

[@EdwinGarcia-vn9ri]

I am Nicaraguan and it was good that the serious ones with subtitle or in Spanish the videos

[@realpars]

Hi Edwin, happy to hear that the subtitles are helpful for you.

[@eartian3154]

Many many thanks for your effort, for your time, for such good quality informative videos...

[@realpars]

You are very welcome, Asif!

[@simplereef4854]

I work with DeltaV and this video explains to me why I have to import DD files all the time when the new transmitters were installed.

[@realpars]

Great to hear that!

[@Jordy-5810]

Excellent video thanks to what I have seen in these 17 minutes I have learned a lot about what a hart protocol is and what advantages it can give me when using it!

[@realpars]

Glad it was helpful, Jordy! Thanks for your comment.

[@josephleon9141]

Excelent Video The way that hart allows u to have feedback is alone a great advantage the fact that can also give instruccions and allow modification is really amazing.

[@realpars]

Thank you, Joseph!

[@hammadshahid4816]

I've no words to thank you for your these useful videos. Plz upload some videos on control valves , positioners, its calibration, commissioning and trouble shooting as well

[@realpars]

Thanks for your kind comment, Hammad! and thanks for sharing your suggestion with us! I have sent this over to our course developers. Happy learning!

[@hammadshahid4816]

@@realpars bundle of thanks

[@renegadeflower575]

I liked it before watching it because I knew was going to be good. With realpars you get world class controls education you don't get elsewhere..

[@realpars]

Hey! Thank you so such a positive feedback. Very glad to hear this. :)

[@hb120877]

Online education is pretty good.....!

[@hb120877]

@@realpars this is very good stuff..

[@03caifan1983]

Very well explained. Simple, and to the point! I just subscribed to your channel and will be looking forward to more videos from you Sir!!

[@realpars]

Happy to hear!

[@gajendradixit1911982]

Very nice video, and animated explanation of concepts is really really good.

[@realpars]

Thanks for the positive feedback Gajendra!

[@stuntgirl56-therachelvande24]

never measured the output of emf on devices, good reminder video, takes me back to GM days..

[@derickguambo4218]

Nice video, you explained very well about the hart protocol, now I understand the subject much better.

[@realpars]

Amazing! Thank you, Derick!

[@borisespinoza2218]

Excellent explanation of HART protocol, I found it a very informative video.

[@realpars]

Glad you enjoyed it, Boris! Happy learning

[@amitteke6224]

Great Information. Note As per Bell 202 modem AFSK encode and transfer data at a rate of 1200 bps & not for 12000 bps.

[@Graham_Wideman]

And also not a 12,000 Hz tone, as mentioned a few seconds later. This is all around 6:00.

[@ΒασίλειοςΧρηστίδης]

Τhe best channel for automation and information for the operation of the industry

[@realpars]

Thanks a lot for your kind compliment! We are always extremely happy to hear such positive feedback! If you ever have any questions, feel free to reach out to us. Happy learning!

[@JamesVestal-dz5qm]

This helps bridge the gap between my operator and technician work experience and the engineering classroom.

[@realpars]

Glad to hear that! Happy learning

[@joseluisgomez4405]

A very good video. Please, continue with this kind of lessons very useful for those who like technology.

[@realpars]

Great to hear! We will surely continue. Happy learning!

[@juancarloscarmensolano2598]

Wow! is the Best explanation that i have heard about HART. Thanks for sharing

[@realpars]

Thanks for your support, Juan!

[@kapilrathi7116]

Great technical explanation in easy to understand way..thats workable.thanks

[@realpars]

You are very welcome!

[@nguyenoan4431]

Many thanks for admin! I am from Vietnam. Follow u manny video, it is very useful!!!

[@realpars]

You are welcome! Very happy to receive such feedback!

[@jakubhavlicek1155]

Thank you for the video. I have learned something new today from you.

[@realpars]

Hi Jakub, you're very welcome! Yes! It's such a good feeling when you learn something new. :)

[@k.avishnuprakash2996]

I've watching ur videos, which are giving good idea. Please continue

[@realpars]

Happy learning!

[@judahking6776]

RealPars you'r the best !! Thank you 4 ur vids 👍👍👍

[@realpars]

Glad you like them! Thanks for your support

[@steevenrodriguez2678]

Remember, in a power outage, an analog phone will keep working as it has its own power supply. good to have a backup 'dial' phone without the battery. you can still call emergency, do not need batteries or power.

[@instrumentationgate5180]

@RealPars Thanks for ur Video... Easy to understand & i'm confused before watch this. Now got a idea from this video. Thnks lot.

[@realpars]

You're most welcome!

[@eyad4404]

Very great information with very easy explanation... Thanks

[@realpars]

Happy to hear. You're welcome!

[@hashbrown14]

Great vid. Note, at 6 minutes the narration says 12,000 bits per second, when the video shows 1,200 Hz.

[@realpars]

Thanks for letting us know, Richard! I will forward this to our course creators.

[@carlosfhurtado24]

Great video, i would like to know which PLC are you using... and if you can use the HART protocole with any Siemens PLC (more specifically with the S7-1200 and S7-300).

[@realpars]

The video did not specify the PLC model since it is showing how HART is used in a universal, generic way. For use with an S7-1200 or S7-1500, you just need to make sure that your analog input card is one that supports HART protocol. There are HART-enabled AI cards (and AO cards) available for most all of the Siemens S7 PLC models.

[@mahirsarkarlee7526]

It was very useful information about HART, thanks!

[@realpars]

You're very welcome!

[@mariomoralestorres1285]

You explain very well. Congratulations for your videos. Greetings from Mexico.

[@realpars]

saludo! Happy to hear that! :)

[@mohamadismailbasha6083]

Thanks for the effort put on this excellent video

[@realpars]

Glad you enjoyed it! You're very welcome

[@jxxlwiz]

Useful Information about HART Protocol and such a nice explanation for newcomers

[@realpars]

That's great to hear, Joel! Thanks for sharing.

[@pcrb2695]

Dear, please make a video on why only 4-20mA current loop and 0 to 10VDC are bacame as a instrumentation signal what is the practical reason and how n from where these values are derived .

[@realpars]

Hi Hara, Thanks for sharing your suggestion with us! I have sent this over to our course developers. Happy learning!

[@sigritdelgado4858]

A great explanation and easy to understand, thank you

[@realpars]

Glad it was helpful, Sigrit!

[@Fridaydude]

Thanks for the great video guys, really informative! I have a question though, which is not clear to me from the explanation. Regarding the wired networking of multiple sensors, how many wires will you have in the end? Is it a 1-1 connection for each of the sensors, or can you somehow impose the wiring of all of the sensors involved and end up with 2 in the end, with the capability to access or request data from whichever one you wish at any given time? Thanks and keep up the good work!

[@realpars]

Most networked, or bus-connected, sensors operate with 2 wires, (+) and (-). The difference between bus-connected and single sensors is that in bus-connected, the many sensors are connected in series, with a Bus-in and and Bus-out connection. The "out" from the last sensor in the bus returns to the common connection of the circuit. With a single sensor, the "out" returns directly to the common connection of the circuit. The two wires form a current-loop circuit and there is a (+) and (-) wire, with the signal overlaid on top of the circuit as communication moves from (+) to (-). That is a little bit of an over-simplification, but both wires are always used in communication because both are required to complete the electrical circuit.

[@ahmedjoo1858]

Just to add that while communication and power will be carried over 2 wires only for as many HART sensors connected in parallel, however you are still limited by the PLC card or data logger limitation where each sensor will utilize a single channel off the master card.

[@messagetous]

Enlightening. Never stop learning do we? I learned my Directv modulates 13 and 18 volts. Sounds like the old Bell protocol might last forever.

[@realpars]

We surely never stop learning, thanks for your support, Keith!

[@ramgr6888]

Nice and lovely explanation. Keep it up. Thank you and continue your videos.... good luck

[@realpars]

Thanks and you're very welcome, Ram!

[@kevinvilla149]

Great explanatory video, it helps me a lot to understand where HART communication comes from and actually gives me an idea of ​​support and maintenance implementations in the industrial area.

[@realpars]

Thanks a million for your kind comment, Kevin! Glad to hear that it helped you out.

[@niralmistry841]

Nice & knowledgeble video sir🙏🙏please provide other instrumentation related videos 🙏🙏

[@realpars]

Thanks a lot, Niral!

[@patilvikranta]

Very well explained. Thanks you for sharing, keep sharing knowledge base videos.

[@realpars]

Glad to hear that, Vikrant! You're very welcome!

[@joethespo]

Audio states 12000 Hz. But video shows 1200 Hz. Which is it? VERY grateful for this and the other RealPars videos. Best around.

[@realpars]

Hi Joe, Thank you! I just checked and you're right, it should be 1200 Hz. Thank you for letting us know.

[@realpars]

1200 Hz

[@josecastellanos8890]

Congrats!! I love it, and i'd appreciate if you can make videos about analog signal, thats what i am learning😅

[@realpars]

Hi Jose, thanks for taking the time and giving us your feedback. We will consider your suggestion for creating new videos.

[@therushi1]

@@realpars hey Mate, can you make a video on HART MULTIPLEXER please?

[@arbabkhan1596]

Very informative....... thanks to Realpars

[@realpars]

You're very welcome! Happy learning!

[@davidmejia9011]

Great thank you i admire how you share your knowledge cheers from Honduras

[@realpars]

aclamaciones! :)

[@mohamedelazhary6009]

Many thanks for the comprehensive explanation

[@realpars]

It's our pleasure, Mohamed! Happy learning.

[@אלעדמור-ט4ה]

That video was very helpful ... Make things a bit more clearly to me point of view.. thank you for your time, for making this video.

[@realpars]

You're very welcome, happy learning!

[@mrkareka100]

Thank you for your wonderful lecture. Really appreciated. Is it 1200 Hz or 12000 Hz at 6:11 mnt? Please clarify.

[@realpars]

1200 Hz. The graphic is correct. The narration was not. I believe someone else pointed this out last year, but it is worth repeating again. Thank you for your comment.

[@mulengamukuka3458]

I would like to how the scada system works.

[@realpars]

Hi there, I have passed your request on to our creator team.

[@jherard2439]

One question with the Profibus communication network, can you send analog data? If it is not possible then the profibus cannot regulate the process, therefore it only sends information from the sensor to the plc but does not regulate the process, is this correct?

[@realpars]

Hi there, Thank you for your question, great one! Profibus communication converts all the signals in the communication protocol needed and transmits them, then converts them back to the receiving end. The PLC regulates the process as needed. Happy learning!

[@Spy653]

Is there any way to have sensors send interrupts to masters? or can sensors only respond once told by the master?

[@realpars]

HART protocol is based on the older Bell 202 protocol. In this node-based protocol, only Master nodes can send data requests. Sensors (nodes) do not have the facilities to generate interrupts or initiate communication.

[@davidllivisaca5337]

Muy interesante y claro, es un protocolo super útil para el mundo de los programadores.

[@realpars]

Gracias, David!

[@marlonmoraleda9953]

Thank you for all the useful videos! Just a quick question do you have an Online Course for Schneider Modicon M580 that uses Ecostruxture Control Expert?

[@realpars]

Hi Marlon, Thanks for your comment! We currently have video courses on Siemens, Allen Bradley and Phoenix Contact - PLCnext. Happy learning!

[@k.avishnuprakash2996]

I wish to have a clarification, how to connect non-hart field transmitter having output 4-20 mA with HART communication network or HART enables PLC? Whether i can go with adapter to make my field device into HART enabled?

[@realpars]

A HART-enabled transmitter still requires a 2-wire connection at the Analog I/O card. PLC cards typically allow selection of HART mode and non-HART mode (i.e., HART enabled or disabled) for HART-enabled analog cards. If you have a transmitter capable of HART communication, you can choose to use the HART functionality or not, but enabling or disabling HART communication at the I/O card. Leaving the I/O channel with HART disabled allows traditional 4-20ma loop-powered signals to be sensed at the analog input card. You should refer to the manufacturer's I/O card documentation for verification of this feature. An analog or digital transmitter cannot be converted to a HART transmitter with an adapter. A transmitter must be manufactured as a HART device.

[@pcrb2695]

Dear, kindly let us share knowledge on how to calculate & select right PLC power supply rating amps based on PLC inputs (DI&AI) and outputs (DO&AO)

[@realpars]

Thanks for sharing your suggestion with us! I have sent this over to our course developers. Happy learning!

[@helaldoust8282]

Feel proud to you Parsi Legends, Khaste nabashid

[@anon44492]

Beautifully explained

[@realpars]

Thanks a lot, Krishnam!

[@thewise65]

Thank you so much for such an amazing explanation ♥

[@realpars]

Glad you enjoyed it!

[@khaleedan]

Thank u man for all this information real appreciate ,the jobe u have done.

[@realpars]

Thanks a lot for your kind comment! Great to hear that.

[@rajeshkdu]

Super Prasentation Sir 👌

[@realpars]

Thank you, Rajesh!

[@randho5150]

So since the Hart signal is a frequency wave, is it AC voltage riding on the DC 4-20mA?

[@scottlampe70]

Not quite. If you recall, a rectified dc voltage is not quite flat, it has its peaks and troughs like ac voltage, but they average out to a dc voltage above zero. Rewatch at around 12 minutes.

[@kevinguadalupe1404]

Such a good video, i liked how did you explain this useful tool.

[@realpars]

Thank you, Kevin! We appreciate that

[@amerdouleh2892]

thanks for video but i have question please why the division based on 1200 and 2200 HZ

[@sumitpawar7373]

while designing the protocol they have designed in such a way that 1200hz means binary 1 and 2200hz means binary0

[@vijiashok]

FANTASTIC EXPLANATION

[@realpars]

Thanks a lot! Great to hear that.

[@mr.flashback332]

Thanks, very informative. Question: Can an Ultrasonic flow sensor with HART output been connected to an analogue input card that does not support hart, if only the 4-20 mA signal is used?

[@scottsommer6480]

Yes, but the HART capability will not be available to the control system. However, the HART signal is still being communicated, so using a handheld or PC-based interface can still make use of the HART signal. Many plants use this approach. The advantage of using a HART-enabled PLC or DCS analog input card is that you will have the secondary PV, SV, and TV all available to the control system, as well as the primary PV and diagnostic info about the device.

[@mr.flashback332]

@@scottsommer6480 muchas gracias

[@erisherm.8451]

Absolutely beautifully articulated 😂😂